Well a single layer, unreinforced brick wall isn't really that strong, especially near the top edge. It's perhaps plausible they didn't feel anything or at least nothing very alarming. I mean, the gear presumably still retracted properly and deployed later for landing, so it wasn't damaged too badly.
Yea I'm interested in seeing what the passengers say. If they just heard a bump or didn't suspect a thing, the plane may have just graised it and the pilots didn't notice. If the passengers heard a noticeable sound or reported concerns and were dismissed, that's grounds for negligence.
I don't know about you but I hear plenty of clunks and wirring on planes during take off and landing, sometimes uncomfortably loud and even though I know a bit about planes, I don't know if it's normal or not. (I'm alive so I assume it is normal!)
One takeoff I was on, the plane was vibrating like crazy, like I've never heard before but after a few minutes, it stopped and nothing happened!
Sorry boeing engineers didnt have you at the table when they were choosing features to optimize for, you know, toggling through priorities and costs of features in terms of thrust, drag, weight, power, etc.
The rules are based on the fact that landing is harder on the airframe than taking off, so as long as max takeoff weight is only a fraction higher than max landing weight you get a pass.
And at any rate you get the greater of 10 minutes or 1% of max takeoff weight per minute to dump enough fuel to land safely. I wonder how long it takes a 737 to circle the runway before it's safe?
20 percent of fuel is used from take off to cruise altitude. On a plane like a 777, that still leaves a very substantial amount of fuel onboard. However on a smaller plane like a 737, you don't have to circle for too long before you're below MLW.
No, from the description, they clearly ignored reports that they "may have hit something", they said "nah, we good." It'll be interesting to see, when the passenger reports start coming in, whether it's plausible the pilots just didn't feel it.
Maybe it didn't feel that bad in the cockpit, and the pilots were hoping they would wing it. They may have thought it would have endangered their jobs (which it certainly will...)
Usually in times of partial emergencies, there is a threshold point where you full own the emergency and declare it.
This is being downvoted, though is true to my understanding -- not uncommon for even the largest airports to have both ILS and non-ILS runways. (e.g. Runway 1L at SFO is non-ILS.)
In this particular case, the departure airport only had one runway, and immediately after the botched takeoff it was at least in dire need of a debris check, so I wouldn't be surprised if the airport was closed while that happened. Wouldn't have taken four hours, though, and I suspect that they would do whatever they could to accomodate an emergency aircraft had the pilot declared.
A lot of pilots don't use ILS and use a visual approach. That was one of the issues with the SF airport, as the left runway was closed, the lights were off and the pilot lined up with the taxi way.
While it is true that the normal lighting was off (because it wasn't a valid runway at the time), there was a lighted, flashing X to indicate that fact. Along with the fact that the taxiway was not illuminated as a runway, and the pilots were notified about the runway closure…
I have been trying to go over how this could happen. The damage to the wall seems so severe that I would image even over the sound of the engine the pilot would hear and notice that they had hit a wall. Flying the plane at this point would be risking their life. The first thing that came to my mind was the only reason a pilot would risk his life is if his life was already at risk and if he had been drinking when he hit the wall he would face many year in jail I assume for putting lives at risk. In a panic says to himself the plane is damaged but I know it can still fly and takes off without a plan really but perhaps just to let the alcohol he had leave his system. I hate to speculate here on HN. This is just crazy to me and I really look forward to hearing more details as to how his happened.
Pilots would have to blow 0.0 but that doesn't mean zero evidence of alcohol. In 4 hours you can metabolise around 4 standard drinks out of your bloodstream. It's not like drugs where any trace is bad because it's illegal.
That said, I'm not sure I am on board with the explanation. It could just be that with everything going on in a cockpit it wasn't noticed.
A fever is, at it’s core, an increase in metabolic rate. Your hypothalamus is telling your body that it’s temperature set point is higher than usual, and it takes energy to raise your temperature. I don’t see how a difference in air pressure would have a similar effect.
other way around - reduced air pressure is reduced oxygen, which is lower metabolism. Higher metabolism causes EtOH degradation to go more quickly. Fever is higher metabolism.
Your blood oxygenation will stay at 95-99% even while in a cabin.
Metabolism in aircraft is pretty low: you’re generally sitting idle, but I think the alcohol metabolism is still constant except the terminal metabolism.
Fever is partly metabolism, but largely reduced cooling.
I've taken an oximeter with me on flights before, and can give a data point of n=1 to say this isn't the case.
My oxygen % decreased initially with altitude until it stabilised around 90-92% (at ~10k feet, IIRC). It sat at this point for the whole flight (8 hours), with a low of 87%.
Through forced rapid deep breaths I could get it back up into the mid-high 90s, but also got light headed and funny looks.
Not a pilot, and not trying to be an armchair pilot, but why would he have ascended all the way to 36000 feet? Isn't there a real risk of depressurization with hull damage?
I'd rather not trust my life to "probably". If there was some damage to the hull or a cargo door that could lead to failure, it's under more stress and is more of a hazard as the altitude increases.
Engine power is a fraction of weight. Even at full thrust (which is rarely used in commercial service, even for takeoff), the engines are only capable of 0.25g or so.
@ codeisawesome If he only had a small drink he might have though a couple hours flight time is all his body needed to metabolise the alcohol to where it wouldn't be detected. Again I hate to speculate here and hope that there is a more rational explanation as to why things went the way they did. For example like captain_perl said at a certain speed the pilot is commited to take off. Ok, but why continue flying and not get enough height to turn around and land immediately? Was he following some protocol that states continue climbing then assess damage? Did air traffic tell him to proceed as planned? To the casual observer here, things don't add up. I am hoping there is some explanation but at this point something weird seems to have happened or we are missing a part of the picture. Very interesting.
Cargo is definitely pressurized. Not heated/aced, but pressurezed the same as the rest of the cabin. Everying from the skin inwards is under 5000ish feet of pressure.
Heated in that the air becomes warmer as it is compressed. But not the additionally-heated air provided the main cabin. Even so, at low air density even -30 would take a while to cool the large mass of bags.
V1 is the takeoff decision speed, not the accelerate-stop distance.
The accelerate stop distance is the distance it takes to accelerate to V1, reject the takeoff, and stop the aircraft. V1 is in KIAS (knots of indicated airspeed). ASD is in feet/meters.
You are correct that passing V1, the aircraft is committed to fly unless an emergency relating to controllability surfaces.
> After V1, the accelerate-stop distance, the pilot is committed to continue flying.
I'm not a pilot, but I'm 100% sure V1 means you can't safely abort the takeoff, _not_ that you're committed to the remainder of the flight.
Also, the ILS is at the end of the runway, they were surely airborne by this point (i.e. past V2), so I'm not sure why you even brought up V1 in this discussion.
In fact, I can't imagine being so low at the end of the runway. At somewhere like Midway (MDW), you'd almost certainly hit a house, at the very very least the perimeter fence.
> In a case like this, the pilots would want to climb to several thousand feet and evaluate the situation before landing.
I'm fairly certain that in an emergency situation you don't "evaluate the situation". Short of actually being unable to fly, you have to take off after V1. If there is any issue whatsoever, you alert the tower and begin to come around to do an emergency landing using "normal" emergency procedures.
Over at http://pprune.org the suggestion is that the pilot's seat was not locked into position correctly and slid back during takeoff. This caused the pilot to pull back on the stick too early and his instinct was the push forward to keep the plane on the correct trajectory. He likely over-corrected and ended up flying 6ft off the ground at the end of the runway where the landing gear caught an antenna and the chainlink fence on top of the brick wall.
Ugh, there have been Cessna deaths caused the same way. It's my least favorite failure mode to think about, since there's no obvious way to correct. In a Cessna, best you can do is release the yoke and tiptoe on to the rudders, but professional instructors have still died when this happens to them, since low altitude errors are often not correctable by the time you've lost too much altitude.
Usually there ought to be more than one locking mechanism involved, though..?
Could be because people don't generally drive 40 year old cars! The aircraft in the first fatal link above was manufactured in 1979 and the seat failed in 2016; the second was manufactured in 1969 and crashed in 2014.
And because it would be less likely fatal in the car, so you'd be less likely to hear of it happening.
(Less likely fatal because car collisions are less fatal due to e.g. airbags, and less likely to impact terrain since it only takes a second to undo your car seatbelt, and because there's no pitch control to have messed up.)
If your car seat slides back unexpectedly, the most likely problem will be a decreased ability to press down in the accelerator. The seat would generally slide back only under forwards acceleration. Under braking the seat would slide forward giving positive pressure onto the brake pedal.
You would keep steering the car, while also attempting to unlock the seatbelt. Depending on the car, you could also activate the parking brake. (In my car, it's a button on the center console, and it can be activated at high speed and will provide emergency braking.)
"Serious" is still not the same as "fatal", even if your car hits something. If your plane stalls and falls hundreds of feet, my understanding is that the fatality rate is going to approximate 100%.
My wife knows of two fatal car accidents caused by this. Don't adjust your seat whilst driving peeps, and make sure it clicked into position before you drive if you adjust it.
My front driver's seat adjustment is all motorized - but not the passenger seat. Originally it annoyed me (the motors are so slow to move!) but now I'm wondering if it might be an intentional safety feature - it's never "unlocked", so you won't suddenly slide away from the pedals and wheel because a part failed to latch right.
Suppose your car seat hasn’t locked. You drive, then you suddenly go up a hill, and the seat slides back. Well, fine, you hold on to the steering wheel (or not), stop, take a breath, adjust the seat, and carry on.
Suppose your plane seat hasn’t locked. You taxi around to the runway (slow and always level), then you begin the takeoff run. Already, you have some acceleration pulling back. Then you gently pull back the yoke to rotate. Now, suddenly your seat slides back. You hold onto the yoke, stall, and die. Or you let go off the yoke, and now the plane is unpiloted in the crucial take-off phase. And, note, stopping is not an option at this point.
That’s why vigorously thrashing around in your seat is part of the before-takeoff checklist (“Seat - LOCKED”).
I've flown A380 and B747 on a commercial (Lufthansa) simulator. Both had seats which could be only moved with motors (locking in any position). Don't know how it is with B737 but I would assume the same (for this very reason).
As some of the others have mentioned, the reason the plane survived is likely because that was not a pressurised area. If it had breached the pressure vessel they would've noticed it very quickly (lack of pressurisation).
Not really - If there had a been a gash in pressurization, they would have caught it on the way up. The 737 is a _tank_. It has more or less the same wing load as a F-16. It takes a lot to shake around - it's every bit the 1950s build 707 chassis, and like the old 50s lathe - it can take a hit and keep going.
Both were from fatigue, but fatigue doesn't have to be a gradual thing; it could come from a single hit that causes the pressure vessel to fail at altitude.
Damage can be less severe than an actual puncture of the pressure vessel. Damage can weaken the pressure vessel such that it only fails (possibly explosively) once under pressure.
Luckily for this flight, that they didn't damage the pressure vessel and then blow it out at high altitude. Better to stay low, not pressurize, and land "at the nearest suitable airport."
The airplane does not require pressurization to fly. If the cabin fails to pressurize, there'd be an automatic warning and the pilots would put on oxygen masks and lower the altitude.
i could not find a reference but i remember an incident where an aircraft only scraped its backend on take off and repairs were made, but years later the aircraft was lost with everyone on board after cracks propagated up and around and the aircraft lost its whole tale section
Those incidents (CAL611, JAL123) only happened because the repair was completed improperly to begin with and subsequently missed by every inspection.
There's no reason the aircraft can't be properly repaired, and be as strong as it was when it was delivered. The Boeing Structural Repair Manual is very precise. It was just ignored.
Can we take a moment and reflect on the fact that all of this data is freely available to anyone? I can sit in front of my computer, or anywhere with my phone, and follow planes around the world with an accuracy of a few meters, and replay the data at a later date.
The various flight trackers all use thousands of receivers around the world, and most of them probably use the same kind of SDR chip that was originally designed for USB TV and radio receivers.
I thought they track things like small vibrations in plane body due to such incidents. How would they detect Bird strike(https://en.m.wikipedia.org/wiki/Bird_strike) if
hitting wall go unnoticed? Don't airports have sensors and cameras for such situations to alert Air traffic control immediately?
Question for professional pilots here: does this feel like normal behaviour for a pilot?
From my limited experience of pilots, this seems entirely unlike the kind of behaviour you'd expect - they're usually conservative when it comes to safety or is that just the projected image to reassure the public?!
I used to work as a flight instructor and flew corporate. I’ve flown small airplanes with a bunch of airline pilots, whatever that is worth.
This does not seem like normal behavior from an airline pilot at all. I can see about 10% of private pilots doing something like this. It would probably be someone who has been flying a long time and gotten way too comfortable. Things always work out, so why not this time? The difference with an airline is its incredibly public flying. Even if the pilots disregard everyone’s safety (including their own) they know that they’ll be caught. You do something dumb and it’s going to be on the news, even if it all works out. How many of us can say that about or jobs?
The fact that the crew thought that this was a risk worth taking reflects really poorly on the safety culture of that airline. They thought that flying an airplane that was compromised some unknown amount was worth keeping the schedule going (or maybe people just wouldn’t find out?). That idea got informed somehow.
Unfortunately don’t have time for a long post at the moment, but as an airline pilot and instructor/check pilot, I can say that extreme incompetence exists in the airline world, especially in Africa, India, SE Asia. There could be some very good reasons that they chose to continue, and often I learn those reasons when the facts are released, discovering that a good decision was made. I’ll be following the investigation, but this one seems somewhat alarming to me. Here’s another of mind-blowing incompetence, also from India - https://www.ajc.com/news/national/airliner-forced-land-after....
Also, more automated, single-pilot/ground operated or pilotless aircraft can’t come soon enough.
Hull loss rates by region of operator per million departures (Jet / Turboprop) 2012-2016: [0]
- 2.21 / 7.38 Africa
- 1.17 / 20.59 CIS
- 0.74 / 3.42 Middle East / North Africa
- 0.53 / 1.55 Latin America / Caribbean
- 0.48 / 1.45 Asia Pacific
- 0.22 / 0.98 North America
- 0.14 / 0.73 Europe
- 0.00 / 8.73 North Asia
India falls below Myanmar, Nepal, Pakistan in air safety audit[1]
>The audit — ICAO Universal Safety Oversight Audit Programme — seeks to identify if countries have effectively and consistently implemented the critical elements of a safety-oversight system.
>India is one of the 15 countries that are below the minimum target rates.
I appreciate the hull-loss facts, but do they directly support "pilot incompetence"? I've read enough NTSB reports to know it's usually multiple congruent factors (aircraft maintenance, organisational culture, pilot work-load).
“extreme incompetence exists in the airline world” does not equal “pilot incompetence” but would rather include aircraft maintenance, organizational culture, ... So the facts support the statement perfectly well.
This is highly misleading and deceptive. You are mixing up the headline and data from link 2 which is mainly focused on which government agency licenses ATCs as the reason for lower scores, to the IATA hull loss data from link 1 which does not single out any country or region for below 'minimum safety target rates'.
This is the IATA data for hull loss rates for 2017 per million departures:
Asia Pacific - 0.18
CIS - 0.92
Europe - 0.13
Latin America and the Caribbean - 0.41
Middle East and North Africa - 0.00
North America - 0.00
The second link does not mention or link to anything about hull loss, safety issues, aircraft, training but talks about lower ranking due to ATC licensing by government agencies.
For uncommon events like aircraft hull losses, I very much prefer the larger sample size of a few years, even if it does put the data slightly out of date. Though note - the IATA there notes that 2017 indicates a recent (last-few-years) trend of increased safety in sub-Saharan Africa.
GP poster was quite clear that the two pieces of data were from different sources, and the five-year data shows clear trends (though with
The second is an article discussing India's poor audit results in the ICAO safety audit, per the quote above the link and sourced to it.
I'm not sure how you can claim that the second link doesn't "link to anything about hull loss, safety issues, aircraft, training". It is the result of an independent safety audit by the ICAO, which encompasses licensing, operations, airworthiness, and a number of other categories[0].
Cultures where hierarchy prevails over CRM and recent graduates can recall page 243 of the manual but can't do a visual landing in a perfect day are also dangerous.
Or I was going to sleep and didn’t want to stay up to write a report on my phone. Use your data but consider my anecdotal comment above. The aviation world is more opaque than one might think, and the governing bodies in certain areas are extremely protective of what is a great source of pride for their countries. I’ve worked with many people from these regions, talked with many people who work with people from these regions, and know many people who have worked in these regions, in addition to the exposure that comes from simply being in this industry. The system is designed to protect you and does its job, even when certain operators aren’t up to par, including the pilots.
Cathay has a pretty good reputation, I believe. The HK civil aviation authorities, so-so, but all right. Struggling to get the expensive new ATC center to work.
The accidents rates by country paints a completely different picture. [1] This wikipedia list of glaring pilot incompetence leading to fatalities doesn't seem to show any bias for specific regions. [2]
When using anecdotal data one just can't make sweeping judgements and conclusions data does not support, that takes discussion into the region of prejudice and bigotry.
This anecdotal one person usually 'an insider' finding one thing wrong or incident in some country and casually conflating it to the whole is seen too often and creates grossly inaccurate stereotypes, when the exact same issue or incident exists everywhere else.
This is not harmless and derails informed discussion. It creates prejudice and in this case stress among travelers when they travel to other countries thinking about 'training, hull loss, safety' based on uninformed discussion not supported by data on the ground. If you are going to travel in a Cessna the standards including pilot training is not comparable to jets whichever country you are in. But no stable functioning country in the world takes passenger and running jets casually as the accident and safety data shows.
That first link is pretty inapplicable - the numbers it shows are total fatalities and total accidents since 1945, not scaled for population of the country, not scaled for the quantity of air travel (in a time range where, especially early on where air travel was least safe, there were vast regional differences in wealth and frequency of flying), and over a long enough period that it doesn't really reflect the current reality.
Your second link is exactly the same kind of anecdotal BS you're complaining about - a list compiled by English-speaking editors on a Western-centric website of pilot errors they've personally heard about.
This is the IATA data for hull loss rates for 2017 per million departures from your link:
Asia Pacific - 0.18
CIS - 0.92
Europe - 0.13
Latin America and the Caribbean - 0.41
Middle East and North Africa - 0.00
North America - 0.00
And it ends there. No mention of any problems or concern for 'safety limits' for any region. Infact the IATA data is overall happy with the rates across regions. If you can find anything on that page that points out a problem for a specific region please link to it.
From same link: "2017 was a very good year for aviation safety."
The link includes a comparison with the previous year (2016) - onboard fatalities were ~90% lower and jet hull losses were ~75% lower. You're cherry-picking a very atypical year.
These numbers seem correct, but I don't see how they add up to "extreme [pilot] incompetence" mentioned upthread. The countries that do worse are poorer, and therefore consistently fly older airframes with worse maintenance schedules, and regulations aren't as strict.
For all we know Africa has the best pilots in the world but the crappiest airframes, or fantastic pilots and awesome airframes but their maintenance is atrocious.
I'm not saying I find that especially plausible, but until these numbers are at the very least adjusted for hull loss rates by region of operator per million departures per age of airframe we're comparing apples to oranges.
That first link tells you little without knowing the denominator for each country. How many flights did they have over that period of time?
And it covers more than 70 years, which is way too long to tell us whether a country or region has a bad safety record today...maybe America had 99% of its crashes in 1945, whereas the other countries on the list had all of theirs last year.
There is nothing about the ‚why’. Maybe they had an engine problem past V1 and decided to go. The long go around can be explained with them having to focus on stabilizing the situation, maybe involving problems with the landing gear. Even with the severe damage, the inner cabin and pressurization must have been intact. Assuming human failure should come last, when we have no details about the cause.
Well, I hope the pilots were not so dumb. I mean, there is still the FDR and recorded radio comms. If they took that time to overwrite the CVR, then they will probably lose their job anyway due to the suspicion of hiding, even when they would be acquitted of wrongdoing in a legal proceeding.
Not a pilot but familiar with the aviation world and procedures.
Obviously the plane had issues getting off the ground. Probably because it was too heavy. Typically, pilots calculate a speed beyond which they can no longer safely abort the takeoff. Beyond that speed, the plane is basically going to fly or shoot off the runway and crash. That point is decided based on weight, wind, runway length, etc. It's entirely possible mistakes were made with that or with loading the plane. Maybe there was some wind shear as well, which could explain a sudden drop or unexpected challenges getting off the ground.
Usually the co-pilot's job is to call these speeds out and if either of them calls to abort, there is supposed to be no discussion or debate on this and pilots are trained to act right away because every second counts. Obviously that did not happen
So, the pilots were not aware of issues before the abort speed (or they should have aborted) and committed to getting off the ground. I'm sure the in cockpit recordings will be part of the investigation. They sort of succeeded in the sense that they hit some objects but ultimately did not crash and got off the ground. Their climb rate must have been terrible. Usually the gear comes up as soon as you have a positive rate of climb (reduces drag). I imagine they called gear up seconds after leaving the ground before they hit anything even and the gear was likely transitioning.
Wind shear could have caused enough change in airspeed to cause the plane to not climb or even descend a bit. A heavy plane would have used up most of the runway in any case.
They then proceeded with what looks like normal procedure to get to altitude. Presumably they would have almost climbed out and changed frequencies from tower to local traffic controllers after 20-30 seconds or so. Recordings of that are going to be interesting. Presumably the damage to the ILS equipment would not have been noticed right away on the ground and people would have needed some time to figure out what the hell happened and what caused it and what plane hit it. Likewise the damage to the wall would not have been reported right away. By then the plane would have transitioned out of their area.
The question is whether the pilots noticed that they hit any objects and what the communication was with these controllers on this. The plane would have been pitched up (restricts visibility to the ground in front of you) and the damage occurred pretty far behind the pilots. So they may not have seen the obstacles immediately in front of them or heard/felt hitting them. These planes are big and heavy and there's lots of noise and vibrations when a plane takes off.
The damage looks dramatic but you wouldn't be able to see it until after the landing. Obviously the plane was flying and climbing and cruising normally. And they also landed safely. So flight operations seem to not have been directly affected. So, I can see them concluding that they had a stressful takeoff but had gotten in the air successfully. Then some time later they got the news that they hit some obstacles and that there is probably damage to the plane.
The big question is why that took 3 hours. I imagine it involved a lot of communication on the ground.
Not that I know of. Mandatory drug testing in sports is now common. When operating heavy machinery, and when a lot of lives are at stake, I feel some safety procedures are called for.
They are, but not for every flight. I've been told by pilots flying in Europe they get randomly selected for a breathalyzer test once every 20 flights or so.
I'm impressed the plane flew for 3 hours without getting destablized and crashing....
Air India has the worst safety reputation in India, and several accidents / incidents. I flew Spice Jet a few times over the last few weeks when I was there visiting. Spice Jet is like India's Virgin America. Service was excellent and I did not experience any issues while flying.
The most surprising part is, trichy to mumbai takes hardly 1hr flight time. What caused them to take 4hrs?
In 4hrs, they could have landed in Dubai itself easily
Being Indian, I agree with statement about AirIndia. I would never fly in AirIndia even if the ticket price is too low, laughably they usually cost way above than any other competitors.
What caused them to retun in half way? Report says Trichy airport informed pilot about posssible damage to plane. Pilot ignored it saying everything is green.
What happened in 4hrs to divert back to Mumbai is still mystery. Will be interesting to see full report
Do you think it's even theoretically possible that an air traffic controller will say "looks like you might be having trouble with your plane... we're not going to allow you to land here. Go elsewhere"
It is much more likely that Air India dispatch wanted the airplane repaired at a base where they have maintenance.
I also suspect it was better for the crew to end their last airline flight as crew in their home country...
A few years ago, was on a Delta flight out of Detroit to Boston. Over halfway to Boston, we turned back as the airplane had a maintenance issue that Delta wanted to deal with at DTW rather than BOS. (They do have a permanent presence at BOS, but a larger one at DTW.)
And even non-major ones! I hear you can even land at an air force base in the US as a civilian private pilot without any negative consequences, providing you have declared emergency.
Yes, if you have nowhere else to go, but it's a last resort and there's definitely a high chance of fines or more serious consequences, especially if it's an active base with sensitive material or operations.
I'm not aware of any more serious consequence having ever happened for a legit emergency, and I am aware of fatal accidents where private pilots were e.g. out of fuel and didn't realize the AFB was an option even though they could've made it.
You know, it's funny, you save the plane, then you get second guessed about whether you used air Force resources wisely, which can have serious repercussions. Or as a professional, have consequences to your career.
It is a crap shoot, based on optics, and partially based on real data. You have to hope your investigator, or boss, sees the data the same way you did....
You made the opposite choice, lose your airframe and your life, and then you should 'clearly' have made the other decision, because the data's in...
No, that almost certainly wouldn't happen. If you declare, you're basically given cart blanche provided you can reasonably justify your actions, and if an AFB is closer than a civilian airport, for example, its absolutely okay to land there (though you should probably give them a call first saying you're landing). Your first priority is not dying; legal consequences don't matter when you're in that situation, and the FAA knows that. If breaking a law will save you they'd rather you do that than die, and they almost certainly won't punish you for it.
Nobody is arguing that it's not ok, but consequences always exist regardless of conditions.
In this case, it's not about the FAA. An military base can choose not to prosecute once they investigate, but don't assume that they are just fine with strangers landing. Emergencies can be staged and, as stated, if there are sensitive combat and intel operations ongoing then it will be a serious incident.
This is no different than calling search and rescue to save your life, and then getting a bill afterwards. Still an emergency, and still has consequences.
"Being Indian, I agree with statement about AirIndia. I would never fly in AirIndia even if the ticket price is too low, laughably they usually cost way above than any other competitors."
Since I have flown with Air India, would you mind being more specific? Are the statistics? My flights were okay. Okay, zero status miles credited at Star Alliance and a bit stingy with alcohol on board. But food and service was good, plane looked well maintained.
I used to be a government employee and was required to fly Air India so I flew it a fair bit. Personally, the flying bit was not that different from others. Their website was a nightmare to book on, usually I found them generous with alcohol on international flights, but sample size is small here. Their miles were hard to use, too many conditions. Staff was a bit low on professionalism. Saw a couple of fights between flight attendants.
I book 90% of my flights on Vayama, so no problem here.
I once decided to book direct only on airline websites to make a possible ticket change easier and cheaper. The one time I tried it I had serious trouble. VPN blocked by airline, based in China, google captcha required which requires a VPN etc. I tried the booking process 4 times until I bought a ticket on Vayama. Later got an email from the airline ("your ticket got issued") so I ended up with two tickets for the same flight. I emailed them and they reimbursed the money. It was Sri Lanka airlines.
I had a flight around 2 AM on night, and man, the crew were so sleepy. The crew who made announcement during landing was close to yawning. I am highly suspicious they were taking nap on the back of the plane.
I've flown on them thrice. All three flights were delayed, even when it was a 35 minute flight from Jaipur to Delhi (supposed to land at 9:00pm, landed at 11pm).
When I last checked, their website literally did not work (clicking the booking button after entering your details took you to a 404 not found page)
It's a disaster of an airline, especially when cheaper options such as Indigo are way more punctual
They had to expend the fuel as dumping is not always an option, when you have a tail strike you don't take risks at landing, consuming the fuel to reduce weight and minimize the risk of fire is a basic option.
Not really. If there was a decompression the very first thing that the pilot would do is immediately descend to 10,000 feet. The aircraft is one giant pressure vessel with wings strapped to the sides. Taking that up into thin atmosphere when it might be compromised is a bad idea.
Also, in a plane that cannot dump such as the 737, to burn off fuel one would prefer to stay in the thicker lower part of the troposphere. Going to altitude not only risks decompression, but it actually preserves the remaining fuel due to lower drag.
That is not a maneuver a pilot with a known-damaged aircraft would make to burn off fuel.
Fun fact: Air India is a state owned airline that has been bailed out with tax payer money multiple times. Attempts to sell/privatize the airline has failed too so far.
Please. Spice Jet is perhaps second to only AI in sucking in all aspects of a good flight. They get delayed, their service is bad - you press the air hostess button, she comes after 5 minutes, then takes another 20 to get you that glass of water with a look that says they you're indebted to her. Food served is average at best and pathetic in almost all flights of theirs. Check-in counters filled with girls that talk too much and focus more on being pretty than being fast.
I see some wires coming out, they can't possibly have not noticed, they must have lost some instruments, surely some warning lighted up in the cockpit.
It wouldn't be the first time a crew errs in calculating their takeoff performance and uses too low a thrust or flap setting. Everyone on that plane is lucky to be alive, as others have died after similar takeoffs.
Yes, the autothrottle commands the thrust as calculated for a Flex take-off. But it's only correct if the input parameters are correct. There was a Sunwing 737 which bent the runway lights at Belfast in 2017 because the pilots had entered the wrong temperature variable:
Unless I'm misinterpreting the satellite image its ~150m from the end of the runway to that wall[0] and it also looks a bit downhill from the runway to the wall[1].
I don't see how this could happen without the pilots noticing; they would have been skimming the ground well past the end of the runway.
Perhaps they were slightly airborne, like 0.5m above the ground, but ground-based instruments recorded the plane as still being "on the ground" (i.e. same altitude as the runway) because of the downhill slope? If they really were on the ground, the pilots would have continued to feel the vibration of the wheels against the ground, a very clear indication that they aren't flying.
I'm even more surprised that the plane could land on its own wheels despite the huge gash in the fuselage. Do landing gears retract so quickly, or was the wall simply not wide enough?
There appear to be two holes knocked in the wall, spaced about the right distance to be made by the two sets of wheels. I'm not surprised that the wheels are strong enough to knock a few bricks over & still work fine.
I also think the wall is lower than the ILS gear, so probably that is what made the gash in the belly of the plane. Amazed that nothing serious was cut.
I cannot believe the pilots were completely unaware, I mean just reaching the end of the runway without having pulled up must be a never-in-your-career kind of scary moment.
I have no first-hand information, but I think this is going to turn out to be a reduced thrust takeoff with the crew being unaware of that (meaning they screwed up).
Airliners have enough power to lose an engine at a decision speed (V1) while still on the runway and on the one remaining engine continue to accelerate on the runway to rotation and eventually liftoff speed and still clear obstacles. There is no mention of an engine loss causing this issue (and surely the airplane wouldn't launch for FL360 with one engine INOP), so this almost has to be a mis-set takeoff thrust accident as, with both engines set for proper takeoff thrust, it's rare to use more than 2/3 of the runway and the initial climb is brisk due to the large excess of power a turbojet engine has at sea level.
The landing gear is built to withstand hitting a concrete runway with a 737, whereas a thin brick wall can be brought down with just a hammer. It's like rock-paper-scissors: wheels beat wall, ILS antenna beats fuselage skin.
Pilot did not follow the climbing trajectory, too low and hit the boundary wall. Nothing surprising in India where everyone follows his/her rules, if such thing called rules exist. Looks like pilot was flying as if he is driving on Indian road, a dent or a tear here and there is not a problem, as long as engine is running. Finally, Indian sky has become a reflection of Indian roads, what a shame!
Indian aviation doesn't kill more thousands due to the great work that Airbus (mostly) has done to keep poor airmanship killing people.
But at the end of the day, look at incidents in India and it's clear: perhaps revert to trains. Yes, they have a poor record too, but proportional to numbers of journeys/passengers to death or accident, minor compared to Indian air carriers.
There are worse places to take off/land. Midway (MDW) has very little distance from the runway to houses and highway. Princess Juliana International Airport on Sint Maarten (SXM) has very little distance from the end of the runway to the ocean. Gibraltar International Airport (GIB) is also basically on the water.
Overrunning the runway is often considered avoidable from my limited understanding. Planes are flight worthy under _a lot_ of issues. Even single engine failure or engine fire after V1 (the speed at which you can't abort/reject takeoff without overrunning the runway) isn't cause to abort/reject takeoff.
With landing, the plane needs to touch down early enough and at the correct speed to stay on the runway.
Overrunning the runway is never considered a "good" thing. Rejected takeoffs that shouldn't have been and bad landings are often causes of death. They're expected to not happen.
Who wants to wager that the pilots did an aviation version of the five stages of grief, with some help from passenger / flight attendant reports?
FO: Tower said we hit something, may have damage.
Capt: Just close, we'll be okay.
FA: We heard a thump, and so did the passengers.
CA: Just a noise, we'll be okay.
Dispatch on ACARS: You hit the localizer and wall past the far end, you morons. Descend, lower your cabin diff pressure, and GTF to Mumbai.
CA: How do we explain this?
FO: Ask the passengers for newspapes, we must find new jobs..
I hate articles introducing three-letter-mysteries and leaving the readers in confusion. To add insult to injury, none of the comments seem to acknowledge that the topic is impentrable.
What is the mysterious ILS that was hit?
Even after reading the Wikipedia article, I only have a vague idea - seems to be a radar system, both on ground and in the air. Did the plane hit a radar tower?
ILS stands for instrument landing system. It's a set of antennae that produce radio signals to guide the aircraft to the runway. The plane must have struck one of those antennae.
The article is very clear for pilots and people with knowledge in aircraft industry, it is meant for them. ILS, ADS-B, stuff that is basic domain knowledge. There are strange things in the article, like how a plane with severe damage was allowed to raise to 36,000 where catastrophic decompression is possible (like https://en.wikipedia.org/wiki/Japan_Airlines_Flight_123), but the basic information is there and clear.
I think that the audience most interested in such stories especially from this source is familiar with the terminology so they don't waste time detailing it.
How many articles posted here on HN tell you what a CPU is? Or a pointer? Or a container? And that's just to pick a few common terms. News about a certain topic will build on the assumption that the basic concepts related to it are already known to the reader.
You raise a good point, but in the end the situation is not similar.
The situation in the article can be very well explained in layman's terms. Most people know enough of the ground-world and air-world to understand how things hit and what's important about hits.
However, the article uses an overly specific term, and on top of that, it overloads it with a meaning which is not the one found in literature. Notice that Wikipedia's diagram of "ILS" shows it as an airport-sized system made of several components, none of which is called "ILS".
This doesn't make understanding possible, unless you know what "ILS" means in the lingo.
In IT terms, this is akin to saying "A sysadmin tripped over a CISC and fell". To someone familiar to the terms, this translates to "someone tripped over a silicon chip with a CPU, most likely an Intel".
Meanwhile, a layman would look up "CISC" on Wikipedia and be confused about whether someone trippped over a computer box, an instruction set, or a processor. All of this is confusing and irrelevant to the point, which can be understood by anyone: someone tripped over a few cm wide piece of silicon.
Back to the aviation article: "A plane hit a few meter high tower housing an ILS antenna." conveys all the information, but doesn't leave anyone in the cold.
I stand by my initial complaint: any speech that obscures the actual topic behind lingo available only to a small group of people should stay in that small group or improve.
> I stand by my initial complaint: any speech that obscures the actual topic behind lingo available only to a small group of people should stay in that small group or improve.
These days, with the internet at everyone's fingertips, I find it very hard to understand the "I couldn't find what it means" explanation when a simple search for ILS returns some pretty clear explanations on Wikipedia or Quora on the very first results page. No need to even click a link. And if you do click you get pictures, explanations, everything you could want including how they can be hit [0]:
>> A localiser antenna. Point of interest: In case of an aircraft over-running the runway, it is the localiser antenna which gets smashed!
And keep in mind that FlightRadar24 is not a site for the laymen. It's for people with an explicit interest in aviation and there's a definite assumption that you understand these concepts. Perhaps other sources were clearer. Just like it's assumed you know what ADS-B, kts, or FL(350/360) are. They aim for a different audience.
Others have noted that ILS stands for Instrument Landing System. It’s a system used for landing airplanes when you can’t see the runway, typically getting you down to 200 feet, but with special training and equipment you can get down to 100 or even zero (autoland). ILS is the world standard for getting airplanes onto runways in bad weather.
The ground portion of an ILS consists of two antenna arrays, one at the end of the runway called the localizer, and one just off to the side called the glideslope. These arrays produce two fan-shaped signals that vary left-to-right and up-and-down in such a way that an aircraft can determine its location relative to the runway with remarkable precision. The localizer signal provides lateral guidance to the runway centerline, while the glideslope provides vertical guidance down to the touchdown zone, usually on a 3° glidepath. One or both of these arrays is what this airplane ran into.
The system is passive, in that the signals are simply broadcast from the ground continuously, aren’t unique to a particular aircraft, and there is no return or response from aircraft. The ground antennas simply “shout into the void” as it were, and aircraft receivers determine their location based purely on the shape of the signals at the aircraft’s location in space.
For illustration here is a localizer antenna (though note that the airplane in this picture is “backwards,” i.e. the localizer for a given runway is at the far end of the runway, though it is possible to “fly the backcourse” and land with one at the near end): https://image.slidesharecdn.com/instrumentlandingsystemils-1...
It looks like the plane couldn't properly take off(likely overloaded), and it's not just an overrun. See the speed graph in the post, and the fact that the gears were retracted that low.
I don’t think we have enough information to make that statement yet. Could be they forgot to set flaps, could be they miscalculated TO speeds, could be they misconfigured auto throttle...
As usual, need to wait for investigation and report.
254 comments
[ 2.8 ms ] story [ 259 ms ] threadhttps://twitter.com/shukla_tarun/status/1050581391828836352
https://news.ycombinator.com/item?id=18205837
I guess the majority of the damage was done by the large steel antennae it hit before the wall.
One takeoff I was on, the plane was vibrating like crazy, like I've never heard before but after a few minutes, it stopped and nothing happened!
https://ichef.bbci.co.uk/news/624/cpsprodpb/C99D/production/...
https://aviation.stackexchange.com/questions/9393/why-doesnt...
The rules are based on the fact that landing is harder on the airframe than taking off, so as long as max takeoff weight is only a fraction higher than max landing weight you get a pass.
And at any rate you get the greater of 10 minutes or 1% of max takeoff weight per minute to dump enough fuel to land safely. I wonder how long it takes a 737 to circle the runway before it's safe?
Usually in times of partial emergencies, there is a threshold point where you full own the emergency and declare it.
Also, the airport wasn't good anymore. They had just destroyed the Instrument Landing System at the end of the runway. Nobody should land there.
In this particular case, the departure airport only had one runway, and immediately after the botched takeoff it was at least in dire need of a debris check, so I wouldn't be surprised if the airport was closed while that happened. Wouldn't have taken four hours, though, and I suspect that they would do whatever they could to accomodate an emergency aircraft had the pilot declared.
While it is true that the normal lighting was off (because it wasn't a valid runway at the time), there was a lighted, flashing X to indicate that fact. Along with the fact that the taxiway was not illuminated as a runway, and the pilots were notified about the runway closure…
https://ntsb.gov/investigations/Pages/DCA17IA148.aspx
I feel like if you are so visually impaired, you can't see an object you are facing, you really should't land visually.
That said, I'm not sure I am on board with the explanation. It could just be that with everything going on in a cockpit it wasn't noticed.
If a fever can, wouldn’t alcohol do the same?
Metabolism in aircraft is pretty low: you’re generally sitting idle, but I think the alcohol metabolism is still constant except the terminal metabolism.
Fever is partly metabolism, but largely reduced cooling.
My oxygen % decreased initially with altitude until it stabilised around 90-92% (at ~10k feet, IIRC). It sat at this point for the whole flight (8 hours), with a low of 87%.
Through forced rapid deep breaths I could get it back up into the mid-high 90s, but also got light headed and funny looks.
Moving around the cabin would also raise it.
The cargo area of most airliners is not pressurized, so the gash is not an immediate problem.
In a case like this, the pilots would want to climb to several thousand feet and evaluate the situation before landing.
Looks like the pilot did a great job once it was realized the airplane was damaged of remaining calm and flying the airplane.
A famous example of this is American Airlines flight 96 (1972): https://en.wikipedia.org/wiki/American_Airlines_Flight_96
The thing that doesn't need to happen is flying at full flight altitude when the pressure differential between the inside and outside is greatest.
Still, you don’t want to take a structurally damaged plane high up.
https://en.wikipedia.org/wiki/Helios_Airways_Flight_522
The accelerate stop distance is the distance it takes to accelerate to V1, reject the takeoff, and stop the aircraft. V1 is in KIAS (knots of indicated airspeed). ASD is in feet/meters.
You are correct that passing V1, the aircraft is committed to fly unless an emergency relating to controllability surfaces.
I'm not a pilot, but I'm 100% sure V1 means you can't safely abort the takeoff, _not_ that you're committed to the remainder of the flight.
Also, the ILS is at the end of the runway, they were surely airborne by this point (i.e. past V2), so I'm not sure why you even brought up V1 in this discussion.
In fact, I can't imagine being so low at the end of the runway. At somewhere like Midway (MDW), you'd almost certainly hit a house, at the very very least the perimeter fence.
> In a case like this, the pilots would want to climb to several thousand feet and evaluate the situation before landing.
I'm fairly certain that in an emergency situation you don't "evaluate the situation". Short of actually being unable to fly, you have to take off after V1. If there is any issue whatsoever, you alert the tower and begin to come around to do an emergency landing using "normal" emergency procedures.
It's all speculation at this point.
Usually there ought to be more than one locking mechanism involved, though..?
https://generalaviationnews.com/2018/03/16/failure-secure-se...
https://generalaviationnews.com/2016/10/18/seat-sliding-back...
And because it would be less likely fatal in the car, so you'd be less likely to hear of it happening.
(Less likely fatal because car collisions are less fatal due to e.g. airbags, and less likely to impact terrain since it only takes a second to undo your car seatbelt, and because there's no pitch control to have messed up.)
"Serious" is still not the same as "fatal", even if your car hits something. If your plane stalls and falls hundreds of feet, my understanding is that the fatality rate is going to approximate 100%.
Also, what about adjusting the steering wheel while driving? Sounds like a similar threat.
Suppose your plane seat hasn’t locked. You taxi around to the runway (slow and always level), then you begin the takeoff run. Already, you have some acceleration pulling back. Then you gently pull back the yoke to rotate. Now, suddenly your seat slides back. You hold onto the yoke, stall, and die. Or you let go off the yoke, and now the plane is unpiloted in the crucial take-off phase. And, note, stopping is not an option at this point.
That’s why vigorously thrashing around in your seat is part of the before-takeoff checklist (“Seat - LOCKED”).
https://youtu.be/t9Ugn0jq_60
Those passengers just won the lottery.
I wonder if anyone says, “I won’t be there Gus if it isn’t an Airbus”.
As some of the others have mentioned, the reason the plane survived is likely because that was not a pressurised area. If it had breached the pressure vessel they would've noticed it very quickly (lack of pressurisation).
https://www.bbc.com/news/world-us-canada-43818752
and one of the most famous incidents (in the U.S.)
https://en.wikipedia.org/wiki/Aloha_Airlines_Flight_243
Both were from fatigue, but fatigue doesn't have to be a gradual thing; it could come from a single hit that causes the pressure vessel to fail at altitude.
See the whole list here
https://en.wikipedia.org/wiki/Uncontrolled_decompression#Not...
Edit: clarify, typo
i could not find a reference but i remember an incident where an aircraft only scraped its backend on take off and repairs were made, but years later the aircraft was lost with everyone on board after cracks propagated up and around and the aircraft lost its whole tale section
22 years later!
Worst single-aircraft disaster in history.
There's no reason the aircraft can't be properly repaired, and be as strong as it was when it was delivered. The Boeing Structural Repair Manual is very precise. It was just ignored.
The various flight trackers all use thousands of receivers around the world, and most of them probably use the same kind of SDR chip that was originally designed for USB TV and radio receivers.
http://rtlsdr.org/#history_and_discovery_of_rtlsdr
From my limited experience of pilots, this seems entirely unlike the kind of behaviour you'd expect - they're usually conservative when it comes to safety or is that just the projected image to reassure the public?!
This does not seem like normal behavior from an airline pilot at all. I can see about 10% of private pilots doing something like this. It would probably be someone who has been flying a long time and gotten way too comfortable. Things always work out, so why not this time? The difference with an airline is its incredibly public flying. Even if the pilots disregard everyone’s safety (including their own) they know that they’ll be caught. You do something dumb and it’s going to be on the news, even if it all works out. How many of us can say that about or jobs?
The fact that the crew thought that this was a risk worth taking reflects really poorly on the safety culture of that airline. They thought that flying an airplane that was compromised some unknown amount was worth keeping the schedule going (or maybe people just wouldn’t find out?). That idea got informed somehow.
Also, more automated, single-pilot/ground operated or pilotless aircraft can’t come soon enough.
Hull loss rates by region of operator per million departures (Jet / Turboprop) 2012-2016: [0]
- 2.21 / 7.38 Africa
- 1.17 / 20.59 CIS
- 0.74 / 3.42 Middle East / North Africa
- 0.53 / 1.55 Latin America / Caribbean
- 0.48 / 1.45 Asia Pacific
- 0.22 / 0.98 North America
- 0.14 / 0.73 Europe
- 0.00 / 8.73 North Asia
India falls below Myanmar, Nepal, Pakistan in air safety audit[1]
>The audit — ICAO Universal Safety Oversight Audit Programme — seeks to identify if countries have effectively and consistently implemented the critical elements of a safety-oversight system.
>India is one of the 15 countries that are below the minimum target rates.
[0] https://www.iata.org/pressroom/pr/Pages/2018-02-22-01.aspx
[1] https://economictimes.indiatimes.com/industry/transportation...
This is the IATA data for hull loss rates for 2017 per million departures:
Asia Pacific - 0.18
CIS - 0.92
Europe - 0.13
Latin America and the Caribbean - 0.41
Middle East and North Africa - 0.00
North America - 0.00
The second link does not mention or link to anything about hull loss, safety issues, aircraft, training but talks about lower ranking due to ATC licensing by government agencies.
GP poster was quite clear that the two pieces of data were from different sources, and the five-year data shows clear trends (though with
The first is the bulk loss stats.
The second is an article discussing India's poor audit results in the ICAO safety audit, per the quote above the link and sourced to it.
I'm not sure how you can claim that the second link doesn't "link to anything about hull loss, safety issues, aircraft, training". It is the result of an independent safety audit by the ICAO, which encompasses licensing, operations, airworthiness, and a number of other categories[0].
[0] https://www.icao.int/safety/pages/usoap-results.aspx
Asiana missing a landing in SFO on a perfectly clear day is one example https://en.wikipedia.org/wiki/Asiana_Airlines_Flight_214
Cultures where hierarchy prevails over CRM and recent graduates can recall page 243 of the manual but can't do a visual landing in a perfect day are also dangerous.
About aviation in India, two recent incidents:
Jet Airways 9W-697 where crew apparently "forgot" to pressurize the plane. http://avherald.com/h?article=4bded8e6&opt=0
Air India AI-676 had "inexplicable loss of performance". Crew "forgot" to retract the landing gear: http://avherald.com/h?article=4ac18ec7&opt=0
including Hong Kong?
(Note that HK is considered part of East Asia.)
See here for some news articles on the ATC centre:
https://duckduckgo.com/?q=HK+atc+site%3Ascmp.com
When using anecdotal data one just can't make sweeping judgements and conclusions data does not support, that takes discussion into the region of prejudice and bigotry.
This anecdotal one person usually 'an insider' finding one thing wrong or incident in some country and casually conflating it to the whole is seen too often and creates grossly inaccurate stereotypes, when the exact same issue or incident exists everywhere else.
This is not harmless and derails informed discussion. It creates prejudice and in this case stress among travelers when they travel to other countries thinking about 'training, hull loss, safety' based on uninformed discussion not supported by data on the ground. If you are going to travel in a Cessna the standards including pilot training is not comparable to jets whichever country you are in. But no stable functioning country in the world takes passenger and running jets casually as the accident and safety data shows.
1. https://www.independent.co.uk/news/world/america-russia-and-...
2. https://en.wikipedia.org/wiki/Pilot_error#Notable_examples
Your second link is exactly the same kind of anecdotal BS you're complaining about - a list compiled by English-speaking editors on a Western-centric website of pilot errors they've personally heard about.
Discussion with actual numbers is here: https://news.ycombinator.com/item?id=18206505
Asia Pacific - 0.18
CIS - 0.92
Europe - 0.13
Latin America and the Caribbean - 0.41
Middle East and North Africa - 0.00
North America - 0.00
And it ends there. No mention of any problems or concern for 'safety limits' for any region. Infact the IATA data is overall happy with the rates across regions. If you can find anything on that page that points out a problem for a specific region please link to it.
The link includes a comparison with the previous year (2016) - onboard fatalities were ~90% lower and jet hull losses were ~75% lower. You're cherry-picking a very atypical year.
For all we know Africa has the best pilots in the world but the crappiest airframes, or fantastic pilots and awesome airframes but their maintenance is atrocious.
I'm not saying I find that especially plausible, but until these numbers are at the very least adjusted for hull loss rates by region of operator per million departures per age of airframe we're comparing apples to oranges.
That first link tells you little without knowing the denominator for each country. How many flights did they have over that period of time?
And it covers more than 70 years, which is way too long to tell us whether a country or region has a bad safety record today...maybe America had 99% of its crashes in 1945, whereas the other countries on the list had all of theirs last year.
... by their desire to overwrite the CVR??
Obviously the plane had issues getting off the ground. Probably because it was too heavy. Typically, pilots calculate a speed beyond which they can no longer safely abort the takeoff. Beyond that speed, the plane is basically going to fly or shoot off the runway and crash. That point is decided based on weight, wind, runway length, etc. It's entirely possible mistakes were made with that or with loading the plane. Maybe there was some wind shear as well, which could explain a sudden drop or unexpected challenges getting off the ground.
Usually the co-pilot's job is to call these speeds out and if either of them calls to abort, there is supposed to be no discussion or debate on this and pilots are trained to act right away because every second counts. Obviously that did not happen
So, the pilots were not aware of issues before the abort speed (or they should have aborted) and committed to getting off the ground. I'm sure the in cockpit recordings will be part of the investigation. They sort of succeeded in the sense that they hit some objects but ultimately did not crash and got off the ground. Their climb rate must have been terrible. Usually the gear comes up as soon as you have a positive rate of climb (reduces drag). I imagine they called gear up seconds after leaving the ground before they hit anything even and the gear was likely transitioning.
Wind shear could have caused enough change in airspeed to cause the plane to not climb or even descend a bit. A heavy plane would have used up most of the runway in any case.
They then proceeded with what looks like normal procedure to get to altitude. Presumably they would have almost climbed out and changed frequencies from tower to local traffic controllers after 20-30 seconds or so. Recordings of that are going to be interesting. Presumably the damage to the ILS equipment would not have been noticed right away on the ground and people would have needed some time to figure out what the hell happened and what caused it and what plane hit it. Likewise the damage to the wall would not have been reported right away. By then the plane would have transitioned out of their area.
The question is whether the pilots noticed that they hit any objects and what the communication was with these controllers on this. The plane would have been pitched up (restricts visibility to the ground in front of you) and the damage occurred pretty far behind the pilots. So they may not have seen the obstacles immediately in front of them or heard/felt hitting them. These planes are big and heavy and there's lots of noise and vibrations when a plane takes off.
The damage looks dramatic but you wouldn't be able to see it until after the landing. Obviously the plane was flying and climbing and cruising normally. And they also landed safely. So flight operations seem to not have been directly affected. So, I can see them concluding that they had a stressful takeoff but had gotten in the air successfully. Then some time later they got the news that they hit some obstacles and that there is probably damage to the plane.
The big question is why that took 3 hours. I imagine it involved a lot of communication on the ground.
https://twitter.com/shukla_tarun/status/1050595274869993474
Looks quite severe.
I'm impressed the plane flew for 3 hours without getting destablized and crashing....
Air India has the worst safety reputation in India, and several accidents / incidents. I flew Spice Jet a few times over the last few weeks when I was there visiting. Spice Jet is like India's Virgin America. Service was excellent and I did not experience any issues while flying.
In 4hrs, they could have landed in Dubai itself easily
Being Indian, I agree with statement about AirIndia. I would never fly in AirIndia even if the ticket price is too low, laughably they usually cost way above than any other competitors.
What happened in 4hrs to divert back to Mumbai is still mystery. Will be interesting to see full report
I also suspect it was better for the crew to end their last airline flight as crew in their home country...
A few years ago, was on a Delta flight out of Detroit to Boston. Over halfway to Boston, we turned back as the airplane had a maintenance issue that Delta wanted to deal with at DTW rather than BOS. (They do have a permanent presence at BOS, but a larger one at DTW.)
It is a crap shoot, based on optics, and partially based on real data. You have to hope your investigator, or boss, sees the data the same way you did....
You made the opposite choice, lose your airframe and your life, and then you should 'clearly' have made the other decision, because the data's in...
In this case, it's not about the FAA. An military base can choose not to prosecute once they investigate, but don't assume that they are just fine with strangers landing. Emergencies can be staged and, as stated, if there are sensitive combat and intel operations ongoing then it will be a serious incident.
This is no different than calling search and rescue to save your life, and then getting a bill afterwards. Still an emergency, and still has consequences.
Nothing gets better at FL360 in this situation if your intention all along was to divert.
1. You would not want to ascend to flight level 360 (particularly with a damaged plane).
2. You would not want to leave the vicinity of an airport (particularly with a damaged plane).
Since I have flown with Air India, would you mind being more specific? Are the statistics? My flights were okay. Okay, zero status miles credited at Star Alliance and a bit stingy with alcohol on board. But food and service was good, plane looked well maintained.
Please tell me more.
I book 90% of my flights on Vayama, so no problem here. I once decided to book direct only on airline websites to make a possible ticket change easier and cheaper. The one time I tried it I had serious trouble. VPN blocked by airline, based in China, google captcha required which requires a VPN etc. I tried the booking process 4 times until I bought a ticket on Vayama. Later got an email from the airline ("your ticket got issued") so I ended up with two tickets for the same flight. I emailed them and they reimbursed the money. It was Sri Lanka airlines.
In flight entertainment.
When I last checked, their website literally did not work (clicking the booking button after entering your details took you to a 404 not found page)
It's a disaster of an airline, especially when cheaper options such as Indigo are way more punctual
I don’t think we have enough information yet to establish whether excessive weight was a factor.
That is not a maneuver a pilot with a known-damaged aircraft would make to burn off fuel.
I thought that on airliners pilots input runway length, altitude and wind strength and direction, and the computer optimized the thrust accordingly?
https://www.flightglobal.com/news/articles/temperature-error...
I don't see how this could happen without the pilots noticing; they would have been skimming the ground well past the end of the runway.
[0] https://www.google.com/maps/place/Tiruchirapalli+Internation...
[1] https://twitter.com/shukla_tarun/status/1050581391828836352
I'm even more surprised that the plane could land on its own wheels despite the huge gash in the fuselage. Do landing gears retract so quickly, or was the wall simply not wide enough?
I also think the wall is lower than the ILS gear, so probably that is what made the gash in the belly of the plane. Amazed that nothing serious was cut.
I cannot believe the pilots were completely unaware, I mean just reaching the end of the runway without having pulled up must be a never-in-your-career kind of scary moment.
Airliners have enough power to lose an engine at a decision speed (V1) while still on the runway and on the one remaining engine continue to accelerate on the runway to rotation and eventually liftoff speed and still clear obstacles. There is no mention of an engine loss causing this issue (and surely the airplane wouldn't launch for FL360 with one engine INOP), so this almost has to be a mis-set takeoff thrust accident as, with both engines set for proper takeoff thrust, it's rare to use more than 2/3 of the runway and the initial climb is brisk due to the large excess of power a turbojet engine has at sea level.
Airport perimeter damage: https://mobile.twitter.com/ANI/status/1050582092688629760
Indian aviation doesn't kill more thousands due to the great work that Airbus (mostly) has done to keep poor airmanship killing people.
But at the end of the day, look at incidents in India and it's clear: perhaps revert to trains. Yes, they have a poor record too, but proportional to numbers of journeys/passengers to death or accident, minor compared to Indian air carriers.
Overrunning the runway is often considered avoidable from my limited understanding. Planes are flight worthy under _a lot_ of issues. Even single engine failure or engine fire after V1 (the speed at which you can't abort/reject takeoff without overrunning the runway) isn't cause to abort/reject takeoff.
With landing, the plane needs to touch down early enough and at the correct speed to stay on the runway.
Overrunning the runway is never considered a "good" thing. Rejected takeoffs that shouldn't have been and bad landings are often causes of death. They're expected to not happen.
As far as I can tell this wasn't unusually close to the runway, the plane just stayed on the ground far past the end of the runway.
FO: Tower said we hit something, may have damage. Capt: Just close, we'll be okay. FA: We heard a thump, and so did the passengers. CA: Just a noise, we'll be okay. Dispatch on ACARS: You hit the localizer and wall past the far end, you morons. Descend, lower your cabin diff pressure, and GTF to Mumbai. CA: How do we explain this? FO: Ask the passengers for newspapes, we must find new jobs..
Given the apparent structural damage, that was a risky decision.
What is the mysterious ILS that was hit?
Even after reading the Wikipedia article, I only have a vague idea - seems to be a radar system, both on ground and in the air. Did the plane hit a radar tower?
How many articles posted here on HN tell you what a CPU is? Or a pointer? Or a container? And that's just to pick a few common terms. News about a certain topic will build on the assumption that the basic concepts related to it are already known to the reader.
The situation in the article can be very well explained in layman's terms. Most people know enough of the ground-world and air-world to understand how things hit and what's important about hits.
However, the article uses an overly specific term, and on top of that, it overloads it with a meaning which is not the one found in literature. Notice that Wikipedia's diagram of "ILS" shows it as an airport-sized system made of several components, none of which is called "ILS".
https://en.wikipedia.org/wiki/File:ILS_diagramsimplified.png
This doesn't make understanding possible, unless you know what "ILS" means in the lingo.
In IT terms, this is akin to saying "A sysadmin tripped over a CISC and fell". To someone familiar to the terms, this translates to "someone tripped over a silicon chip with a CPU, most likely an Intel".
Meanwhile, a layman would look up "CISC" on Wikipedia and be confused about whether someone trippped over a computer box, an instruction set, or a processor. All of this is confusing and irrelevant to the point, which can be understood by anyone: someone tripped over a few cm wide piece of silicon.
Back to the aviation article: "A plane hit a few meter high tower housing an ILS antenna." conveys all the information, but doesn't leave anyone in the cold.
I stand by my initial complaint: any speech that obscures the actual topic behind lingo available only to a small group of people should stay in that small group or improve.
These days, with the internet at everyone's fingertips, I find it very hard to understand the "I couldn't find what it means" explanation when a simple search for ILS returns some pretty clear explanations on Wikipedia or Quora on the very first results page. No need to even click a link. And if you do click you get pictures, explanations, everything you could want including how they can be hit [0]:
>> A localiser antenna. Point of interest: In case of an aircraft over-running the runway, it is the localiser antenna which gets smashed!
And keep in mind that FlightRadar24 is not a site for the laymen. It's for people with an explicit interest in aviation and there's a definite assumption that you understand these concepts. Perhaps other sources were clearer. Just like it's assumed you know what ADS-B, kts, or FL(350/360) are. They aim for a different audience.
[0] https://www.quora.com/How-does-the-ILS-Instrument-Landing-Sy...
The ground portion of an ILS consists of two antenna arrays, one at the end of the runway called the localizer, and one just off to the side called the glideslope. These arrays produce two fan-shaped signals that vary left-to-right and up-and-down in such a way that an aircraft can determine its location relative to the runway with remarkable precision. The localizer signal provides lateral guidance to the runway centerline, while the glideslope provides vertical guidance down to the touchdown zone, usually on a 3° glidepath. One or both of these arrays is what this airplane ran into.
The system is passive, in that the signals are simply broadcast from the ground continuously, aren’t unique to a particular aircraft, and there is no return or response from aircraft. The ground antennas simply “shout into the void” as it were, and aircraft receivers determine their location based purely on the shape of the signals at the aircraft’s location in space.
For illustration here is a localizer antenna (though note that the airplane in this picture is “backwards,” i.e. the localizer for a given runway is at the far end of the runway, though it is possible to “fly the backcourse” and land with one at the near end): https://image.slidesharecdn.com/instrumentlandingsystemils-1...
And here is a glideslope antenna: https://i.pinimg.com/originals/8f/56/b3/8f56b3b52fb9b81c84f7...
Here's a good one: https://youtu.be/FeELh0kMSIA