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roll. This prevents operation of the door handle in low
differential pressure and in unpressurized flight.
During takeoff roll, 28v dc goes to the door flight lock solenoid to
retract the plunger.
The flight lock solenoid plunger is connected to the flight lock
pawl shaft. When the lock pawl shaft turns, it engages the pawl
with the lock torque tube.
The lock torque tube can not move to the unlock position.
During the landing roll, the flight lock solenoid is de-energized.
This lets a tension spring unlock the flight lock mechanism.
The tension spring gives a fail safe function. It makes sure that
the flight lock pawl goes to the unlock position when electric
power is not available.
DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM
DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-22-00-007
Purpose
The flight lock solenoid energizes to make sure the emergency
exit door does not open during takeoff and in flight.
Functional Description
The proximity switch electronics unit energizes the flight lock
relay (R742) when these conditions occur:
* 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.
When R737 engine 1 run relay 2 or R738 engine 2 run relay 2 is
energized, the flight lock solenoid energizes and locks the
emergency exit door.
Training Information Point
The engine running signal is sent from the display electronic
unit (DEU). An engine running signal is sent when these
conditions occur:
* The engine start lever is in idle
* The electronic engine control (EEC) discrete is set to RUN or
N2 > 50% (if the digital data bus is invalid).
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EFFECTIVITY
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DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM - FUNCTIONAL DESCRIPTION
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EFFECTIVITY
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DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM - FUNCTIONAL DESCRIPTION
DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Operation
To open the door from the inside, you must pull the handle
down to start the door open sequence.
These are the steps of the door open sequence.
* The latch rollers travel down the latch receivers
* The door travels inboard and downward to clear the stop
fittings
* The counterbalance assemblies are free to turn the door out
of the fuselage cutout
* The door continues to turn from close to open position, the
door opens approximately 125 degrees around the fixed
hinge line
* The hinge arm lock pawl locks when the door is fully open.
To open the door from the outside, push the vent panel inward
to start the sequence.
The door operation is automatic after the initial handle/vent
panel rotation.
Training Information Point
If you open the door from the outside of the airplane, brace your
knee against the door to prevent injury.
DOORS - EMERGENCY EXIT DOOR - DOOR OPEN OPERATION
EFFECTIVITY
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