*
The lock mechanism holds the vent door closed.

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FORWARD LARGE CARGO DOOR SYSTEM -COMPONENT LOCATIONS -2

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FORWARD LARGE CARGO DOOR SYSTEM -COMPONENT LOCATIONS -3

Components on the Door Cutout
The hinge is along the top of the door cutout.
The two pull-in pins are on the forward and aft side of the door
cutout.
Eight main latch pins are along the bottom of the door cutout.

Components Near the Door Cutout
The internal door control switch is in the cargo compartment ceiling, near the forward end of the door cutout.
The P43, external cargo door control panel is forward of the door cutout.
General Description
The door rotates on the hinge as it opens and closes.
The pull-in hooks on the door engage the pull-in pins to pull the door into position where it can be latched.
The latch cams on the bottom of the door turn around the latch pins to latch the door.
Training Information Point
The internal cargo door control switch and the door control switch on the P43, external cargo door control panel, let you operate the door electrically.
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FORWARD LARGE CARGO DOOR SYSTEM -COMPONENT LOCATIONS -3

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FORWARD LARGE CARGO DOOR SYSTEM -DOOR AND DOOR SEAL

Purpose
The door and door seals close and seal the external access to the forward cargo compartment.
Physical Description
The door is a non-plug, structural load carrying type. It has inner and outer skins, beams, frames, intercostals, and a hinge.
The blade type pressure seal goes completely around the edge of the door.
Functional Description
The continuous, piano-type hinge attaches the door to the airplane. Latches and locks hold the door closed. The door is part of the airplane load carrying structure when it is latched and locked.
The door pressure seal prevents air flow from the cargo compartment to the outside.
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FORWARD LARGE CARGO DOOR SYSTEM -DOOR AND DOOR SEAL

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FORWARD LARGE CARGO DOOR SYSTEM -LIFT POWER UNIT

Purpose
The lift power unit supplies the power to open and close the door.
Physical Description
The unit has these components:
*
Connection to the lift manual drive

*
A three phase, 115/200v ac, 400 Hz motor with a brake

*
A gear box

*
Two drive shafts.

Functional Description
The motor supplies torque through the gearbox and torque tubes to rotary actuators.
The gearbox gets torque from the lift manual drive when you lift and lower the door manually.
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FORWARD LARGE CARGO DOOR SYSTEM -LIFT POWER UNIT

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FORWARD LARGE CARGO DOOR SYSTEM -LIFT MANUAL DRIVE

Purpose
The lift manual drive lets you manually lift and lower the door.
Physical Description
The lift manual drive has two 3/8-inch square drive sockets. A drive shaft goes from the socket on the forward edge of the door, through a gear box, to the lift power unit. A short shaft connects the socket on the outside of the door to the gear box.
　
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