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If it's the flap closing, you should be able to verify that from the APU ECAM page. Based on the time frame you mentioned, most likely it's the simulated overspeed, which is part of the shutdown sequence and is basically the signal that closes the fuel solenoid (which you can also verify from the APU page). APU flap closing comes later. For more on the ...


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The Aircraft Flight Manual or Flight Crew Operating Manual will specify the timeframe during which engine oil may be checked after engine shutdown. For the CF34-3B engine on a Challenger 605, checking must be done between 15 minutes and 2 hours following shutdown. If done outside of this window, the engine must be dry-motored (cranked without introducing ...


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