Aircraft use bleed air from the compressors on the jet turbines to pressurize the aircraft and ventilate the cabin. Damage to the bleed air system would (and does) cause that.
13 posted on 04/20/2012 3:44:14 AM PDT by rlmorel
(A knife in the chest from a unapologetic liberal is preferable to a knife in the back from a RINO.)