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* An idler crank
* A cam with a roller track
* A cable drum and cable.
When the door is closed, the spring-loaded roller is
compressed and on high cam (on the cam nose).
The spring force extends the roller. This action causes the cam
to turn.
The cam turns on a shaft that is common to the cable drum.
When the cam turns, the cable drum also turns.
As the cable drum turns, it retrieves (pulls in) a cable. The cable
runs through a pulley to a ceiling bracket in the cargo
compartment. As the cable shortens by the winding action of
the cable drum, it lifts the door.
An uplock detent in the cam track holds the door in the fully
open position. The door stays in the open position until you pull
downward on the bungee lanyard to close the door.
A nut on the ceiling bracket end of the cable adjusts the cable
(to take up cable stretch).
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Training Information Point
The entire threads of the adjustment fitting should engage the
spring-loaded roller rod. If the thread engagement is not
sufficient, the spring force can strip the fitting threads. This
would cause the fitting to fly off the end of the rod with a great
force.
Secure the baggage in the cargo compartments with the cargo
nets and/or inner cargo panel door properly. This will keep the
baggage from contact with the door and its mechanisms.
If loose baggage contacts the door cable, it can cause the cable
to come out of the door pulley. This can jam the counterbalance
mechanism. If you must free such a jam and return the cable to
the pulley, be careful. The counterbalance can remove the
cable slack very quickly and with great force.
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DOORS - CARGO - COUNTERBALANCE MECHANISM
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General Description
You open and close the cargo door manually. The door has
hinges on their upper edge, and swings open in a upward and
inward motion. A counterbalance mechanism in the door helps
lift the door and holds it in an uplock position.
You can open the door from inside or outside of the cargo
compartment.
Exterior Operation
To open the cargo door from outside the airplane, pull the
handle fully out of its recess and turn the handle
counterclockwise. This disengages the door latch
mechanisms. The door then moves inboard by the action of
the counterbalance mechanism. When the door is free of the
latch mechanisms, return the handle to its recess. When you
begin to push the door open, the door counterbalance will lift
the door to the fully open position and hold it there.
An adjustable nylon safety strap is on the ceiling of the cargo
compartment. You can use it to hold the cargo door in the open
position if necessary.
Before you close the door from outside of the airplane, examine
these things:
* The cargo nets should be secure to prevent cargo from
contact with the door components
* The door frame should be clear of obstruction.
To close the door, do these steps:
* Pull the soft-grip bungee lanyard at the forward edge of the
door. This will pull the door out of uplock and lower the door
until you can reach the handle.
* When you have the handle, release the lanyard and the
bungee will retract it back into the cargo compartment.
* Turn the handle counterclockwise so that the door latch
rollers will enter their latch tracks.
* Pull the door to the closed position with the handle.
* Turn the handle clockwise to fully close and latch the door.
* Return the handle to its recess.
Interior Operation
You can open and close the cargo doors from inside the cargo
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