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valve.
Training Information Point
No special tools are necessary to install the counterbalance
assembly.
Each counterbalance unit contains an integral travel stop that
defines the extended position of the unit. The stop also is the
stop for the door. A threaded adjustment at the end of each
actuator is used to rig the door in the open position.
To prevent injury when you maintain or overhaul the unit,
always use the proper tools. Disassembly is very difficult
without the proper procedure and tools.
A warning placard on the surface of the unit will refer the
operator to the correct section of the overhaul manual.
DOORS - EMERGENCY EXIT DOOR - COUNTERBALANCE MECHANISM
EFFECTIVITY
GUN ALL 52-22-00
Page 14
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-22-00-006
DOORS - EMERGENCY EXIT DOOR - COUNTERBALANCE MECHANISM
DOORS - EMERGENCY EXIT DOOR - COUNTERBALANCE MECHANISM
EFFECTIVITY
GUN ALL 52-22-00
Page 15
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-22-00-006
Propose
The flight lock mechanism prevents the operation of the
emergency door in flight.
Location
The flight lock mechanism for the right emergency exit doors is
on the forward upper half of the door behind the hinge arm.
The flight lock mechanism for the left side emergency exit doors
is on the aft upper half of the door behind the hinge arm.
Physical Description
The flight lock mechanism has these components.
* Flight lock solenoid
* Flight lock pawl
* Support bracket
* Lock torque tube.
Operation
The flight lock mechanism automatically activates on takeoff
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
GUN ALL 52-22-00
Page 16
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-22-00-007
DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM
DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM
EFFECTIVITY
GUN ALL 52-22-00
Page 17
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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).
DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 52-22-00
Page 18
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-22-00-010
DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM - FUNCTIONAL DESCRIPTION
DOORS - EMERGENCY EXIT DOOR - FLIGHT LOCK MECHANISM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 52-22-00
　
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