FORWARD LARGE CARGO DOOR SYSTEM -COMPONENT LOCATIONS -1
EFFECTIVITY BEJ ALL 52-34-00
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777 AIRCRAFT MAINTENANCE MANUAL
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FORWARD LARGE CARGO DOOR SYSTEM -COMPONENT LOCATIONS -2
Components on the Inside of the Door
The two lift mechanisms are near the upper forward and the
upper aft corners of the cargo door.
The two rotary actuators are near the upper, forward and the
upper, aft corners.
The lift manual drive is near the upper, forward corner.
The lift power unit is located near the top, center of the door.
The vent door is near the horizontal mid line of the cargo door,
near the aft edge.
The two pull-in hooks are at the forward and aft edges.
The vent door mechanism goes from the vent door to the lock
mechanism lock pawl on the aft latch cam.
The latch mechanism goes from the latch/hook power unit to the pull-in hooks and latch cams. The latch power unit is on the lower part of the door, near the
center.
Eight main latch cams are near the bottom of the door.
EFFECTIVITY
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The lock mechanism goes from the lock handle to lock pawls on the eight main latch cams at the bottom of the door. The mechanism also goes to the vent door interlock.
The lock handle assembly is near the center of the cargo door.
The latch manual drive is goes from the lock handle assembly to the latch/hook power unit.
The graphic does not show the location of the proximity sensors that do control functions. Their locations are shown at the component level.
General Description
This section describes the function of the components on the inside of the door as the door goes from the fully open position to the closed, latched, and locked position.
The motor in the lift power unit supplies the torque to lower the door. Torque can also come from the lift manual drive. The torque goes to the rotary actuators. The torque goes from the rotary actuators to the lift mechanism. The lift mechanism lowers the door.
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FORWARD LARGE CARGO DOOR SYSTEM -COMPONENT LOCATIONS -2
Electric power shifts from the lift power unit to the latch power unit when a proximity sensor senses the door is completely lowered. Torque goes from the latch power unit to the pull-in hooks. Movement of the pull-in hooks around the pull-in pins on the door cutout, pulls the door into the latch position.
After the door is pulled in, torque goes from the latch power unit to all of the latch cams. The cams turn around the latch pins. This latches the door. When a proximity sensor senses the door is latched, electric power is removed from the power unit.
Movement of the lock handle on the outside of the door to the lock position, locks the door. The lock action causes these actions to occurs on the inside of the door:
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Proximity sensors cause electric door operation to be disabled
*
The lock mechanism locks the main latch cams at the bottom of the door
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