Non-plug cabin doors

From:         ditka!sgiblab!uunet.uu.net!SSD-HB!gershzohn.gary (B&1&2) (fly boys)
Date:         05 Aug 94 03:35:28 
Organization: McDonnell Douglas Aerospace
Followups:    1 2 3 4
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On a recent TV show profiling the B-777, I noticed that Boeing is no longer
using plug-type doors in the cabin. Does anyone know how they guarantee
that a passenger cannot open it in flight or that the ground crew cannot
open it on the ground if the aircraft is pressurized?
Thanx