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Latch tracks
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Stop pads.
Stops on the bottom of the door cutout mate with hooks on the bottom of the door.
Components near the Door Cutout
The internal door control switch is in the cargo compartment ceiling, in line with the middle of the door cutout.
The P44 external cargo door control panel is forward of the door cutout.
Training Information Point
The internal cargo door control switch and the door control switch on the external cargo door control panel let you operate the door electrically.
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AFT SMALL CARGO DOOR SYSTEM -COMPONENT LOCATIONS -1
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777 AIRCRAFT MAINTENANCE MANUAL
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AFT SMALL CARGO DOOR SYSTEM -COMPONENT LOCATIONS -2
Components on the Inside of the Door
Stops on the top of the door mate with hooks on the top of the door cutout.
These are the components on each side of the door:
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Two guide rollers
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Ten stop pins
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Five ditching stops.
The manual drive flexible shaft goes from the drive socket to the hinge PDU on the airplane structure.
The hinge arms attach the door to the rotary actuator.
The rotary actuators attach to the airplane structure. Torque tubes attach the actuators to the hinge power drive unit.
Hooks on the bottom of the door mate with stops on the bottom of the door cutout.
The two hinge arms on the top of the door attach the door to the rotary actuators on the door cutout.
The bungee is below the lift/latch PDU.
The lift/latch torque tube has latch cranks on each end.
EFFECTIVITY
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The lift/latch power drive unit (PDU) is near the center of the door.
The lockout torque tube has lockout cams (not shown) on each end.
The vent door push rod goes from the lift/latch torque tube to the vent door.
The graphic does not show the location of the proximity sensors that do control and indication functions. Their locations are shown at the component level.
General Description
Pressurization and ditching loads are transmitted from the door to the airplane structure by:
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Hooks
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Stops
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Stop pins
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Ditching stops.
The following tells what the components on the inside of the door do as the door goes from the latched to the fully open position.
The cargo door PDUs get electric power from the ground handling bus when that bus has power. Manual drives can also supply power.
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AFT SMALL CARGO DOOR SYSTEM -COMPONENT LOCATIONS -2
The arming and control switches can send electric power to the lift/latch PDU when a proximity sensor senses the door is not lifted. Force from the PDU actuator goes through cranks, torque tubes, and push rods to these components:
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Vent door
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Latch cranks
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Lockout cams.
The latch cranks lift the door out of the latched (plug) position. The bungee helps move the cranks to the full lift position when the bungee is past center on the lift/latch torque tube. At the end of the door lift, the lockout cams lock the door to the hinge arms so they will rotate the door outward and upward.
Electric power shifts from the lift/latch PDU to the hinge PDU when a proximity sensor senses the door is lifted. Torque tubes transmit torque from the PDU to the rotary actuators. The rotary actuators move the hinge arms so they will rotate the door outward and upward.
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