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Reverse the operations to lower the door.
latch and Lock Operations
Insert the drive tool in the latch manual drive socket. Turn it in the latch direction. The door latches.
Close the handle. Check that the vent door closes. The door is locked if the vent door is closed.
Training Information Point
The door must be unlatched before you lift the door with the lift manual drive.
The door must be full down before you can latch the door with the latch manual drive.
Look through each witness ports along the bottom edge of the door for latch and lock indications. The latch and lock components are black. The indications and target are yellow.
The door is latched if the indication arrow on each latch cam points to the target on each latch fitting. The door is locked if you see all of the door locked circle on each lock pawls.
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FORWARD LARGE CARGO DOOR SYSTEM -MANUAL OPERATION

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FORWARD LARGE CARGO DOOR SYSTEM -MECHANICAL FUNCTIONAL DESCRIPTION

Unlock
Release of the cargo door lock handle starts the unlock operation.
The lock handle connects to the lock mechanism. The lock mechanism has a vent door interlock. Open movement of the lock handle releases the vent door from the vent door interlock. The vent door spring moves the vent door open if the airplane is not pressurized.
The vent door connects to the vent door mechanism. The vent door mechanism connects to the lock mechanism. Movement of the vent door and the lock handle cause the lock mechanism to turn. It moves the lock pawls away from the latch cams. This unlocks the door.
Unlatch
With the door unlocked, the latch power unit or the latch manual drive can unlatch the door. The dog drive connection between the rotary actuator and the lift mechanism leaves free play sufficient to let the pull-in hooks move the door.
Torque goes through linkage to the latch cams and pull-in hooks. The latch cams turn from around the latch pins. The pull-in hooks turn from around the pull-in pins. The door is unlatched and can open.
Lift and Lower Movement
With the door unlatched, the hinge power unit or the lift manual drive supplies torque. Power goes through the rotary actuators and lift mechanism to move the door up and down.
Latch
The latch power unit or the latch manual drive can latch the door when the door is fully down. The dog drive connection between the rotary actuator and the lift mechanism leaves free play sufficient to let the pull-in hooks move the door.
Torque goes through linkage to the pull-in hooks, and the latch cams. The pull-in hooks turn around the pull-in pins. This pulls the door in to where the latch cams can turn around the latch pins. The door latches.
Lock
Return of the lock handle to the close position locks the door. The movement of the handle moves the lock mechanism. The lock pawls move into a position that will not let the latch cams turn. Linkage from the lock mechanism to the vent door closes the vent door. Linkage from the lock handle moves the vent door interlock to a position that will not let the vent door open. The door is locked.
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FORWARD LARGE CARGO DOOR SYSTEM -MECHANICAL FUNCTIONAL DESCRIPTION

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FORWARD LARGE CARGO DOOR SYSTEM -ELECTRICAL FUNCTIONAL DESCRIPTION

General
Sensors on the door give inputs to the proximity sensor electronics unit (PSEU). The PSEU uses the inputs to turn on door position indication lights, and enable door control relays.
　
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