737 Flight Crew Operations Manual
Airplane General, Emergency
Equipment, Doors, Windows -
Systems Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
1.40.46 D6-27370-866-EGP
Emergency Exit Doors
Four Type III emergency exits are located in the passenger cabin over the wings.
These are canopy-type doors and are held in place by mechanical locks and
airplane cabin pressure.
The overwing exit doors can be opened from inside or outside of the airplane by
a spring–loaded handle at the top of the door. The 28 Volt DC flight lock system
is designed to ensure that the flight lock will automatically lock during takeoff,
in-flight, and landing and unlock on the ground to allow for opening of the door
in emergency situations. Commands for the flight lock to lock and unlock are
dependent upon engine speed, thrust lever position, air/ground mode status, and
the open/closed status of the doors.
The overwing emergency exits lock when:
• three of the four Entry/Service doors are closed and
• either engine is running and
• the airplane air/ground logic indicates that the airplane is in the air or
both thrust levers are advanced.
The overwing emergency exits unlock when any one of the above conditions is not
met or DC power is lost.
The LEFT OVERWING and/or RIGHT OVERWING warning lights, DOORS
annunciator, and MASTER CAUTION light illuminate when an emergency exit
door is not fully closed and locked or when the flight lock is not engaged, either
during the takeoff roll or in-flight.
If a flight lock has failed locked or a fault is detected the PSEU light, the
OVERHEAD annunciator, and the MASTER CAUTION lights illuminate. These
indications are inhibited from takeoff until 30 seconds after the airplane is in the
ground mode. When the doors are latched and locked and the flight lock is
operating properly none of these lights will illuminate.
September 15, 2016
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