737NG Loss of thrust on both engines
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Join Date: Nov 2007
Location: Turning outbound
Age: 44
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737NG Loss of thrust on both engines
Hello folks
My questions on this memory recall checklist are these:
After completing the memory portion of it it says further down that Do not wait for successful engine start(s) before starting the APU does that mean that as soon as it's recognized that we lost thrust on both engines we can already start the Apu before doing the memory items?
The reason i' m asking this is because the FCTM says:
Initiate the memory portion of the LOSS OF THRUST ON BOTH ENGINES NNC before attempting an APU starts which contradicts part 7 of the checklist.If the windmill restart is not successful,an APU should be initiated as soon as practical to provide electrical power and starter assist during follow-on engine start attempts,then why this is the case?
Best regards
My questions on this memory recall checklist are these:
After completing the memory portion of it it says further down that Do not wait for successful engine start(s) before starting the APU does that mean that as soon as it's recognized that we lost thrust on both engines we can already start the Apu before doing the memory items?
The reason i' m asking this is because the FCTM says:
Initiate the memory portion of the LOSS OF THRUST ON BOTH ENGINES NNC before attempting an APU starts which contradicts part 7 of the checklist.If the windmill restart is not successful,an APU should be initiated as soon as practical to provide electrical power and starter assist during follow-on engine start attempts,then why this is the case?
Best regards
Join Date: Jan 2005
Location: In t'sky
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I think this is a case of the application of airmanship. If I recognised a dual engine failure I think one of the first things i'd do is start the APU asap. The QRH to me overrides the FCTM
Horgy
Horgy
Join Date: Jan 2008
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Just did this in the sim. Started at FL350, .82 / 340KT descent, got engines started at FL200. Engines restarted before the APU was available. I disagree with the checklist in attempting APU starts immediately as you are wasting battery power, and it will not suction feed start above FL250 anyway. The inflight relight was exceedingly slow and could easily be unintentionally interrupted by cycling the fuel lever.
