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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 the weight of the door
structure. One end of the hinge arm is splined to the door torque
tube hinge pin. The other end is pinned to the hinge link. The
hinge link is splined to the frame torque tube. The door torque
tube turns with the hinge arm. The frame torque tube turns with
the hinge link.
A guide arm mechanism programs the movement of the door
as it swings open or closed. A pin holds the rod end bearing of
the guide arm to an attach fitting in the door hinge support
structure. The other end of the guide arm is held by dual roller
bushings that follow tracks in upper and lower guide plates. The
guide arm pivots around a pin that connects the guide arm to
the hinge link on the frame torque tube.
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 rises into a detent in the upper guide plate. The pin is
concentric to the roller.
To close the door, you must release the hinge from lock. One of
these devices is used to release the hinge from lock:
* A yellow lever on the upper hinge guide arm
* A yellow pushbutton on the upper hinge guide arm
* A yellow release knob on the door frame between the upper
and lower hinges.
Push the lever or pushbutton, or lift on the release knob to
release the hinge from lock. A latch trigger on the guide arm
resets the lock mechanism.
DOORS - PASSENGER/CREW - AFT ENTRY DOOR UPPER HINGE ASSEMBLY
EFFECTIVITY
GUN ALL 52-10-00
Page 25
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-10-00-008
Spring-loaded retainers support pressure seals around the
hinge assembly.
A flap on the outside of the upper hinge assembly covers the
gap around the hinge cutouts. This flap is an aerodynamic seal.
It reduces noise and drag. A spring-loaded hinge attaches the
flap to a body frame.
DOORS - PASSENGER/CREW - AFT ENTRY DOOR UPPER HINGE ASSEMBLY
EFFECTIVITY
GUN ALL 52-10-00
Page 26
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-10-00-008
DOORS - PASSENGER/CREW - AFT ENTRY DOOR UPPER HINGE ASSEMBLY
DOORS - PASSENGER/CREW - AFT ENTRY DOOR UPPER HINGE ASSEMBLY
EFFECTIVITY
GUN ALL 52-10-00
Page 27
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-10-00-008
Purpose
The lower door hinge assembly does these functions:
* Slows (snubs) and stops the door at the ends of the swing
* Structurally holds the door.
Location
The lower hinge assembly is on the forward edge of the door.
General Description
The lower hinge assembly has these parts:
* Hinge arm
* Door snubber and stop assembly.
The lower hinge arm is a beam that holds the door structure.
One end of the hinge arm mates with the door torque tube hinge
pin in a bearing. The other end of the hinge arm attaches to the
frame torque tube spigot with an oval section and pinch bolt.
The door torque tube turns freely about the hinge arm. The
frame torque tube turns with the hinge arm.
A door snubber hydraulically slows (snubs) the door at the ends
of the swing.
The snubber is an oil filled, telescopic, orifice-type metering
device. It limits the rate of motion at the full extend and full
retract positions. As the door opens, it goes from fully retracted
to fully extended. The snubber is held by pins in its spherical
bearings. One pin holds the snubber to door structure. A second
pin holds the other snubber bearing to the frame torque tube
radius link.
The bottom frame torque tube spigot pins the radius link to the
frame torque tube. The radius link has a stop pin. Stop plates
limit the range of motion of the stop pin. At the door or fully open
positions, the stop pins contact the stop plates. This moves the
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