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* Hinges.
Heavy duty, flush-mount latches hold the door closed. The
latches secure the door in the closed position and permit quick
access with their push-button trigger releases. When the latch
is secure (closed), the outer surface is similar in color to the
adjacent structure. The other surfaces of the latch are a bright
red fluorescent color. This allows fast visual detection of an
unsecured (open) latch.
Operation
You open and close the door manually. To release the latches,
apply moderate thumb pressure to the latch trigger. Manually
restrain the door from free fall as you release the latches.
Use the hold open rod to secure the door in the open position.
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
There are two galley service doors on the airplane, forward and
aft. The doors give access to the airplane passenger cabin.
Location
The doors are on the right side of the upper fuselage, across
from the passenger entry doors.
General Description
The door is a plug-type door. The door has these parts:
* Center door assembly
* Upper gate
* Lower gate.
A liner covers the door interior surface.
The center door assembly has hard points at the bottom for the
emergency escape slide installation.
The center door assembly has a window.
Door Control Mechanisms
You can open and close the door from the interior or exterior of
the airplane. You operate the door manually. Unlatch the door
with the central control handle. Then swing the door to the fully
open position with the offset assist handles.
When you turn the handle in the OPEN direction, internal
mechanisms do these things:
* Disengage the door roller latches
* Fold the door gates inward
* Tilt the door hinge edge inward to the cocked position.
Then push the door through the door frame until it is fully open.
Use the two offset assist handles for this operation.
A lock mechanism in the upper hinge locks the door in the fully
open position.
To close the door, first release the hinge lock and then the do
the open operations in reverse order.
A guide pin on the door and a guide pin track on the door frame
center the door in the door frame as it closes.
Door Support
When the airplane is unpressurized, the hinges support the
door.
When the airplane is pressurized, cabin pressure pushes the
door slightly outboard. This causes these things to occur:
* The door seals compress
* The door stop pins contact frame stop fittings. This transmits
the door pressure loads to the door frame structure
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* The door latches are unloaded.
Door Seals
The door has these seals:
* Edge seals (flap type)
* Gate hinge seals (diaphragm type).
Door Drains
The door structure has internal drain paths. The door sections
drain into the door frame threshold. The door threshold drains
overboard through bladders in the lower fuselage.
Door Warning
The galley service doors have an interface with the door
warning system. There is a proximity switch assembly on each
galley door frame adjacent to an upper latch roller track. The
switch senses the position of its associated door latch roller.
When the door is latched, it causes the warning light on P5
forward overhead panel to go off.
An orange pennant is on the door liner above the window.
Manually secure it across the window when the door escape
slide is armed. This is a visual indication to someone outside
the airplane that the door slide is armed.
　
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