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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-30-00-005
General
These are the cargo door components:
* Door liner
* Hinges
* Door handle mechanisms
* Door warning switch
* Counter balance
* Snubber
* Bungee lanyard
* Door seals.
Door Liner
The door liner protects the internal components of the door. It
also reduces noise and heat transmission. Access panels in the
liner give access for inspection, service, and lubrication of the
door mechanisms.
Hinges
Two hinges on the upper edge of the door do these things:
* Give pivotal structural support of the upper edge of the door
* Limit the deflection of the door when the airplane is
pressurized.
Door Handle Mechanism
There are two handles for operation of the door. They engage
the door latch mechanisms. The interior handle projects beyond
the inboard door liner and is in constant engagement with a
handle shaft. The exterior handle is spring loaded into a faired
recess on the door skin. The exterior handle engages the
handle shaft with a spline when you pull the handle out of the
recess.
The handle shaft transmits the motion to the latch torque tube
with a control rod. The torque tube turns the latch roller arms
into the roller fittings on the door frame.
The latch fittings are overcenter devices that hold the door
closed when the plane is unpressurized.
Door Warning Switch
Each cargo door has a pin-type microswitch on one of its latch
fittings. The switches do these things:
* Supply ground discrete signals to the door warning system
when the doors are closed and latched. This causes the
warning light (FWD CARGO or AFT CARGO) on P5 forward
overhead panel to go out
* Supply ground discrete signals to the cargo compartment
light system. When the doors are closed and latched, the
cargo compartment lights go out.
DOORS - CARGO - COMPONENTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Centering Devices
Centering rollers in the door frame align the door between door
pads as the door closes. This closely aligns the stop fittings
between the door and frame.
Stop Fittings
When the airplane is unpressurized, the latch mechanisms hold
the door closed. In the unpressurized condition, there is a slight
clearance between the stop pin and their pressure pads.
Pressurization of the airplane causes the door to move
outboard slightly. This causes these things to happen:
* The stop pins seat on their pads, and transmit door pressure
loads to the airplane structure
* The latch roller mechanisms are unloaded
* The pressure seals deflect fully.
Seals
Seals around the door edges and handle shaft prevent pressure
loss.
DOORS - CARGO - COMPONENTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-30-00-010
DOORS - CARGO - COMPONENTS
DOORS - CARGO - COMPONENTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-30-00-010
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DOORS - CARGO - COMPONENTS
52-30-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The cargo door counterbalance does these things:
* Reduces the force required to lift the cargo door to the open
position
* Holds the cargo door up in the fully open position.
Location
The counterbalance mechanism main assembly is inside the
door structure. Remove the door liner and insulation to get
access to the main counterbalance assembly.
The counterbalance cable runs from the main assembly to a
door pulley, and then to a ceiling bracket. The ceiling bracket
attaches to aircraft primary structure.
General Description
The counterbalance is a spring-loaded mechanical device that
offsets the weight of the door.
The main counterbalance assembly and cable pulley are on the
door structure. The counterbalance attaches to a cargo
compartment ceiling bracket with a cable.
The main assembly has these parts:
* An assembly frame
* A spring-loaded roller
　
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