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* The latch roller mechanisms are unloaded
* The pressure seals deflect fully.
Seals
Seals around the door edges and handle shaft prevent pressure
loss.
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EFFECTIVITY
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DOORS - CARGO - COMPONENTS
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EFFECTIVITY
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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
* 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).
DOORS - CARGO - COUNTERBALANCE MECHANISM
EFFECTIVITY
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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.
DOORS - CARGO - COUNTERBALANCE MECHANISM
EFFECTIVITY
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