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Thread: Aircraft cabin air contamination
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Old Sep 19, 2015 | 5:11 pm
  #5  
davidviolin
 
Join Date: Jan 2010
Programs: UA 1K, Marriott-Gold
Posts: 621
Originally Posted by FlyWorld
I thought that air intake on all aircraft is in front of the engine so when moving in forward direction, it gets fresh air, but if engine is started at idle or plane goes into reverse for push back from taxi, that is the moment when engine exhaust can be sucked in. No?
The air still passes through the engine where it needs to be compressed to reach the cabin.

This video is rather short, but tries to explain the dangers of bleed air systems:
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