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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The door warning system gives the crew a visual indication
when a door is not secure (not latched).
Location
The door warning amber lights are on the door warning
annunciator panel on the P5 forward overhead panel.
The PSEU amber light is on the P5 aft overhead panel. Under
certain conditions, this light comes on when the emergency exit
doors lights come on.
General Description
These doors have an interface with the door warning system:
* Forward and aft entry doors
* Forward and aft galley service doors
* Emergency exit doors
* Forward and aft cargo doors
* Forward equipment compartment access door
* EE compartment external access door.
The door warning annunciator panel contains indication for the
doors when a door is not in the latched position.
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D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The door warning system gives the crew a visual indication
when the doors are not secure (not latched). These are the
doors for which indication is provided:
* Pasenger entry, forward and aft
* Passenger service, forward and aft
* Cargo, forward and aft
* Equipment, forward and EE compartment.
Functional Description
The door warning lights are controlled by proximity sensors
and microswitches in the door area. The proximity sensor is
part of a solid state switch circuit. The circuit consists of a
sensor, an actuator, and a switch card. The sensor and actuator
are on the door.
The circuits for the lights are in the proximity switch electronics
unit (PSEU).
The door warning annunciator module contains the amber
lights. It is on the P5 forward overhead panel.
Operation
The sensor senses the proximity or absence of the actuator and
provides the signal to the switch card. The switch card uses this
signal for the warning light to come on or go out.
The forward access door and the EE compartment door share
the same door warning light. A microswitch is at each access
door.
When a warning light comes on, the MASTER CAUTION and
DOORS annunciator also come on.
When the cargo door is unlatched, the switch card enables
cargo compartment lights.
See the cargo compartment lights section. (SECTION 33-36)
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Purpose
The flight lock logic monitors the airplane systems and sends a
signal when the emergency exit door should be locked or
unlocked.
General Description
All of these conditions cause the emergency exit doors to lock:
* Three or more of the entry/service doors are closed
* Either engine is running
* Air ground logic is in the AIR MODE or both the left and right
thrust levers are advanced more than 53 degrees (TRA).
The flight lock logic is a part of the proximity switch electronic
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