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Old 30th January 2013 | 21:27
  #9 (permalink)  
MOSTAFA
20 Anniversary
 
Joined: Nov 2003
Posts: 567
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From: Hereford UK
I just read this in the study guide

Following other operators’ experience, oil has been known to leak into the bleed air output from the APU and, if the heater is ON, to be transported through the heater vents in the cabin and cockpit.
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