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by cross-bolt sleeves. The center section of the tube is held in
monoball frame bearings. The ends of the torque tube are
bolted to oval spigots. The spigot ovals mate with the hinge
arms.
Coil springs on the torque tubes wind up when the door moves
to the fully open or closed position. This does two things:
* Helps the operator begin to open or close the door
* Helps snub the door at the end of travel.
The spring load is neutral at an intermediate door position.
DOORS - PASSENGER/CREW - FORWARD ENTRY DOOR TORQUE TUBES
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DOORS - PASSENGER/CREW - FORWARD ENTRY DOOR TORQUE TUBES
DOORS - PASSENGER/CREW - FORWARD ENTRY DOOR TORQUE TUBES
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-10-00-005
Purpose
The door torque tubes provide these functions:
* Structural support to the door and hinges
* Pivital axis for door and hinges
* Structural reaction member for the door cocking crank
pushrod (door torque tube only)
Location
The door system has these two torque tubes:
* Door torque tube in the door
* Frame torque tube in the door frame.
To get access to the door torque tube, remove the door liner
and access panel.
To get access to the frame torque tube, remove the access
panel on the exterior of the airplane between the upper and
lower hinges.
Door Torque Tube - General Description
The door torque tube has several short sections held together
by cross-bolt sleeves. The center section is held in the central
door casting bearings by two castle nuts. The ends of the torque
tube cross-bolt to hinge pins. Hinge arm bearings hold the
hinge pins.
Frame Torque Tube - General Description
The frame torque tube has several short sections held together
by cross-bolt sleeves. The center section of the tube is held in
monoball frame bearings. The ends of the torque tube bolt to
oval spigots. The spigot ovals mate with the hinge arms.
DOORS - PASSENGER/CREW - AFT ENTRY DOOR TORQUE TUBES
EFFECTIVITY
GUN ALL 52-10-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-10-00-006
DOORS - PASSENGER/CREW - AFT ENTRY DOOR TORQUE TUBES
DOORS - PASSENGER/CREW - AFT ENTRY DOOR TORQUE TUBES
EFFECTIVITY
GUN ALL 52-10-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-10-00-006
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DOORS - PASSENGER/CREW - AFT ENTRY DOOR TORQUE TUBES
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The upper hinge assembly does these functions:
* Supports the weight of the door
* Controls the motion (swing and rotation) of the door as it
opens and closes.
Location
The upper hinge assembly is on the forward edge of the door.
General Description
The upper hinge assembly has these parts:
* Hinge arm
* Guide arm assembly
* Hinge lock mechanism.
The upper hinge arm is a beam that holds and supports the
door structure.
One end of the hinge arm mates with the door torque tube
hinge. The other end of the hinge arm attaches to the frame
torque tube spigot with an oval section and pinch bolt. The
hinge arm turns with the door torque tube. The frame torque
tube turns with the hinge arm.
The door rotates as it swings open or closed. A guide arm
mechanism programs the door rotation. This is a pantagraph
mechanism. A pin holds the spherical bearing of the guide arm
to door structure. The other end is held by these devices:
* Roller that follows S-tracks in upper and lower guide plates
* Radius link that is connects the guide arm to the frame
torque tube spigot.
Door motion toward open stops when the guide arm roller
bottoms out in the guide plate S-tracks.
A latch mechanism in the guide arm locks the upper door hinge
in the wide open position. When the door is fully open, a spring
loaded pin goes into a detent in the upper guide plate. The pin is
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