767 Auxiliary Power Unit (APU) Start Sequence
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- Опубликовано: 25 авг 2024
- Start sequence of a Honeywell (Garrett) GTCP 331-200 Auxiliary Power Unit (APU) on a Boeing 767-300F. Companion video to "Your Airliner Has A Hidden Engine!" aerosavvy.com/a...
This is a professional video, keep up the fine work.
Nice! Thanks for sharing that with us.
Tom Seagraves You’re welcome. Thanks for watching!
I’m on an APU watching binge again.
Same. The Little Engine that Could
@atmospherelounge4853 couldnt* glorified generator
Hi, I was wondering if I can use this sound ( no video ) for a software production ? Don’t have much but happy to work out a cost . Thanks
Very learnfull
Why does the exhaust temp ("EGT") start out at 136deg? That's way above ambient air temp. And why does it then climb to 780 deg, only to rapidly fall back past 500deg while still running at high RPMs? Did someone cut the fuel and it's still spinning because of momentum? Or is this video out of sync with the audio? As soon as it says "start sequence complete" the temp falls almost 300deg in moments, and I can't imagine any reason why a turbine would do that.
The APU was shut down a few minutes earlier from the previous flight. The 136 degrees is residual heat. The video sync isn't exact, but it's close... Turbine engines reach a pretty high temperature near the end of the start sequence. You see a sharp drop in temperature when the engine stabilizes - fuel flow drops as the engine can sustain itself.
The apu was obviously still hot from being used prior to this start
The 737NG gets a nice analog needle. Gross that it's jammed in the corner of a DU here xD
What is the opening below the apu and under the rudder for ?
I think you are referring to the retractable tail skid.
@@Aerosavvy yes Thanks a lot
Could someone tell me the maximum RPM of an APU? Thx
The GTCP 331 impeller and turbine run at 62,214 rpm. Not sure what the maximum is.
How fast is APU rpm?
The GTCP 331 impeller and turbine run at 62,214 rpm
Up to 90,000 rpm
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