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snubber, and damps door motion.
Spring-loaded retainers on the door frame support pressure
seals around the hinge assembly.
A cover plate on the outside of the hinge assembly covers the
gap around the hinge cutouts. This cover is an aerodynamic
seal. It reduces noise and drag. A spring-loaded hinge attaches
the cover to the hinge arm.
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DOORS - PASSENGER/CREW - LOWER HINGE ASSEMBLY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
You open and close the door manually. Use these steps to open
the door from the airplane interior:
* Move the door to the cocked open position with the control
handle
* Push the door to the fully open position with the door assist
handles.
Use these steps to close the door:
* Release the upper hinge lock latch
* Pull the door to the closed position with the door assist
handles
* Fully close and latch the door with the control handle.
Open the Door
An escape slide is on the inside lower door. If the slide girt bar
is in the armed position, the slide will deploy automatically as
the door opens. Make sure the slide girt bar is in the stowed
position if you do not want the slide to deploy.
The door swings out of the door frame when it opens. Make
sure the area outside of the door is clear.
Turn the interior control handle counterclockwise. Initial
movement of the handle causes the door interior mechanisms
to do these things:
* Door latch roller mechanisms disengage from their door
frame latch track fittings
* Door warning sensor target moves away from the sensor.
This causes the FWD ENTRY or AFT ENTRY door warning
light
* Dpper and lower door gates fold inward. This makes the
door smaller, breaks the door seal, and vents any cabin
differential pressure.
As you continue to turn the handle to the end of the stroke, (170
deg) the door mechanisms to do these things:
* Cocking mechanism swings the door hinge arms (and the
door) inward
* Upper hinge guide arm controls the door rotation as it
swings
* Door goes to the cocked open position.
More force on the door control handle does not cause any more
door motion. The control handle has gone through the full
movement. To complete the door opening operation, push the
door through the door frame with the door assist handles.
As the door opens, wind may push the door. This can pull the
operator through the door frame. To prevent this, keep one
hand on an interior assist handle.
As you push the door through the door frame, the door turns. At
the fully open position, the door is parallel to the airplane
fuselage. The control handle turns 45 degrees.
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At the fully open position, these things happen:
* Snubber and stop mechanisms gently stop the door at the
fully open position.
* Latch mechanism in the upper hinge engages. This locks the
hinge (and the door) in the fully open position.
Close the Door
To close the door, first release the hinge lock. The release
mechanism is yellow. Operate the latch release mechanism to
unlock the hinge. This lets the door swing back into the door
frame.
Hold an internal assist handle to keep your balance. Pull on the
door assist handle to bring the door into the frame until it is in
the cocked position.
Turn the control handle clockwise. Initial movement of the
handle causes the internal door mechanisms to seat the door
into the door frame.
Further movement of the control handle does these things:
* Door latch roller mechanisms engage the door latch track
fittings
* Door latches push the door warning sensor target toward the
　
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