The NTSB will be looking at all factors to establish the failure chain.
Given dual engine flameout indicates a common cause, evidence to rule in or out fuel system starvation and icing will include:
- Flight data recorder fuel tank quantities, fuel temperatures, and cutoff valve positions
- KOSU's samples of jet A, FSII ("Prist" DEGMME) for water content, and vendor and customer purchase records. The aircraft's operator should've purchased A+FSII and it should've contained DEGMME ~0.125% by volume when fueled. Prist is mixed in during fueling but it has to be stored carefully because it's hygroscopic. KOSU's fuel equipment, supply chain, and practices should all be reviewed.
- Records of draining water from fuel tank bleed valves
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[ 4.1 ms ] story [ 13.7 ms ] threadGiven dual engine flameout indicates a common cause, evidence to rule in or out fuel system starvation and icing will include:
- Flight data recorder fuel tank quantities, fuel temperatures, and cutoff valve positions
- KOSU's samples of jet A, FSII ("Prist" DEGMME) for water content, and vendor and customer purchase records. The aircraft's operator should've purchased A+FSII and it should've contained DEGMME ~0.125% by volume when fueled. Prist is mixed in during fueling but it has to be stored carefully because it's hygroscopic. KOSU's fuel equipment, supply chain, and practices should all be reviewed.
- Records of draining water from fuel tank bleed valves
CL 604 limitations document from Canadair[0]
0. (PDF) https://www.smartcockpit.com/docs/CL_604-LIMITATIONS.pdf