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Old 30th July 2011 | 05:10
  #14 (permalink)  
no-hoper
 
Joined: Feb 2010
Posts: 138
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From: Norden
On ground,with packs off,all doors closed you can get negativ pressure via electrical
extraction fans from systems like avionic or galley/toilet air extraction.
For in flight IFixPlanes explanation is correct.
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