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Old 23rd January 2009 | 19:16
  #1148 (permalink)  
PJ2
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Joined: Mar 2003
: ATPL
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From: BC
Originally Posted by user
I don't believe that you can interpret a flame out or not from the wording, but only that there was enough RPM to drive the aircraft power.

To assess flameout you need EGT.
From within the cockpit in order to execute the Engine Shutdown QRH item, yes indeed, but not necessarily in an investigation or as is being done here, informed speculation; "Flame out" can indeed be interpreted from other factors.

Someone has posted that the electrics and hydraulics were normal and that the a/c was in Normal Law. I asked for the source because that hasn't been said anywhere else that I can find. If all that is the case, then the engines were running in some fashion.

I say that because a windmilling N2 at 190kts will not be rotating fast enough to drive hydraulics and keep the generator on line. If even one generator is offline, the aircraft is in Alternate Law.

Either the engine(s) was/were near normal idle at around 55 to 60% N2 and sufficient to drive both systems, or it/they was/were sub-idling (due to damage) in which case very high EGT's would be experienced or it was not running - ie, no flame.

So the statement that the aircraft was in Normal Law is important - I don't see it as merely coming from a Safety Department without supporting information directly from the investigation, for precisely the above reasons.
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