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Old 2nd Jul 2012, 13:08   #1 (permalink)


Probationary PPRuNer
 
Join Date: Jul 2012
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Air cycle machine
Hi,

I had a question about the air cycle machine or the pack? How is it started? Is it done thanks to an electrical motor to start-up the turbine that will drive the compressor? or is it start-up with bleed air and by-passing the compressor?

Thanks for your answers
Regards
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Old 3rd Jul 2012, 04:31   #2 (permalink)
 
Join Date: Apr 2012
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The ACM is started and operated pneumatically. The compressor isn't bypassed.
Last edited by Yeelep; 3rd Jul 2012 at 05:28.
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Old 3rd Jul 2012, 12:07   #3 (permalink)


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Thanks a lot Yeelep!
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Old 4th Jul 2012, 19:57   #4 (permalink)
 
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With exception of the 787, It is an electrical motor as the aircraft uses no bleed air.
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Old 5th Jul 2012, 16:09   #5 (permalink)
 
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Compressor bypass
The compressor section of the ACM is bypassed with startup on the B777's, A340's and A330's as well... as far as I can recall from my type courses I've attended anyway. Compressor bypass valve I think...
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Old 5th Jul 2012, 19:44   #6 (permalink)
 
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I should have stipulated that I was talking about the 737CL/NG
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Old 29th Jul 2012, 12:31   #7 (permalink)


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acm
electrically actuated( pack switch) and pnematically operated .
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