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lift the door. An uplock detent in the counter balance
mechanism holds the door in the fully open position. A door
snubber makes sure the door does not fall quickly if the counter
balance mechanism fails.
A manual strap device in the cargo compartment ceiling can be
used to hold the door in the fully open position.
A bungee lanyard with a soft-grip handle on the door makes it
easy to lower the door.
Door Warning
The cargo doors have an interface with the door warning
system. Each door has a switch on its latch mechanism, and a
warning light on the P5 forward overhead panel.
Access Panels and Liners
Two panels on the exterior door skin give access to the door
latch mechanisms. Through these panels, you can open the
door if the handle mechanism fails.
An interior insulation blanket on the door does these things:
* Protects the door internal components
* Reduces noise and thermal transmission.
Removal of the door insulation and access panels gives access
to the door internal components. This is for inspection,
lubrication, and service of the internal components.
DOORS - CARGO - INTRODUCTION
EFFECTIVITY
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DOORS - CARGO - INTRODUCTION
DOORS - CARGO - INTRODUCTION
EFFECTIVITY
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DOORS - CARGO - INTRODUCTION
DOORS - CARGO - INTRODUCTION
EFFECTIVITY
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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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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
　
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