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* 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.
Training Information Point
See PASSENGER/CREW section in this chapter for more
information on the operation of the galley service door.
(SECTION 52-10)
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DOORS - SERVICE - GALLEY SERVICE DOORS
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Purpose
The crew door separates the flight compartment from the
passenger compartment.
Location
The crew door is at the entrance to the flight compartment.
General Description
The crew door is not a pressure door. It swings open into the
passenger compartment. The door has a mechanical and an
electric lock.
The door has these components:
* Hinges
* Light seals
* Door handle with mechanical (key) lock
* Blowout panels
* Emergency exit panels
* View hole with lens
* Mirror
* Licence and certificate holder
* Door stop mechanisms.
The door is in a frame assembly. The door handle bolt engages
a frame strike assembly. The frame strike has an electric lock. A
lighted, alternate action push-button switch on the P8 panel
controls the electric lock.
Hinges and Light Seals
Hinges attach the door to the frame on the left side of the door.
Seals around the door decrease light and noise transmission.
Door Handle and Lock Mechanisms
The door handle turns to disengage the door bolt from the door
frame strike assembly. The door handle has a mechanical keytype
lock.
When you lock the handle, it does not turn from the passenger
　
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