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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Door System
The flight compartment door provides selective entry to the
flight compartment.
Access is provided by the use of a Keypad Access System
which consists of a numeric keypad outside the flight
compartment area and a chime module and electric strike
that is not accessible from outside the flight compartment.
The chime module provides an audible alert to the flight crew
that the correct code has been entered into the keypad. There is
also an indicator light in the flight compartment and an LED on
the keypad that indicates that the correct code has been
entered.
The flight crew has a 3-position switch by which they can open
the door lock, close the door lock, or permanently lock the door
for a specified amount of time to prevent access by anyone
regardless if the correct code is entered into the keypad.
The door has blowout panels that will open in the event of a
rapid decompression of the passenger compartment.
The door also has a deadbolt so you can lock the door on the
ground while the airplane is parked.
All access to system door control/wiring is protected such that
they cannot be reached from outside the flight deck area, even
after forced removal of the numeric keypad.
The door latch solenoid controls the electric strike.
DOORS - CONTROL CABIN DOOR - INTRODUCTION
EFFECTIVITY
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DOORS - CONTROL CABIN DOOR - INTRODUCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The crew door lock system secures the crew door.
The door handle key lock is mechanical and locks or unlocks
the door handle bolt.
The door frame strike is an electromechanical assembly that
gives the flight crew a way to enable or disable the control cabin
door lock system from their seats.
Location
The door handle with a key-lock bolt is in the door.
The strike mechanism with an electric solenoid is in the door
frame.
General Description
The crew door lock system has these two assemblies:
* A door handle with a key-lock bolt
* A door frame strike assembly with an electric solenoid lock.
The door handle with key lock is a mechanical device. When the
key is inserted (unlocked), the handle will turn and move the
bolt out of the frame strike. When the key is not inserted
(locked), the handle will not turn, and the bolt will not move out
of the frame strike.
The strike mechanism is a spring-loaded, pivoting mechanical
device with an electrically controlled solenoid lock. When the
solenoid is de-energized, the strike is free to turn against spring
force. In this condition, the door handle bolt can push the strike
aside and allow the door to open. The force required at the
handle is 10 pounds (nominal).
When the solenoid is energized, it engages the strike with a
shear pin. This will not let the strike move. In this condition, the
door handle bolt cannot force the strike aside. If the door handle
is locked and the solenoid is energized, the door will not open.
The door security is a function of both the door handle key lock
and the door frame strike solenoid lock. The solenoid lock
enables or disables the strike.
Operational Controls and Displays
A key allows the door handle to turn which moves the bolt out of
the strike.
The CAB DOOR alternate action lighted push-button on the P8
stabilizer trim and cabin door module controls the power to the
strike solenoid. When the strike solenoid is de-energized, the
CAB DOOR UNLOCKED light comes on. When the strike
solenoid is energized, the CAB DOOR UNLOCKED light goes
out.
DOORS - CONTROL CABIN DOOR - DOOR LOCK
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Training Information Point
　
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