PASSENGER ENTRY DOOR SYSTEM -DOORS AND SEALS
Purpose
The passenger entry doors and seals close and seal the external access to the passenger compartment.
Physical Description
The door has these components:
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Outer skin
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Acoustic seal
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Inner skin
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Frames
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Intercostals
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Beams
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Stops
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Pressure seal.
Part of the blade-type pressure seal attaches to the bottom edge and corners of the door. The other part of the seal attaches to the sides and top of the door cutout.
The tube-type acoustic door seal attaches to the top door beam.
Functional Description
The door is a plug-type. The door stops fit against cutout stops. The stops prevent the outward movement of the door when the airplane is pressurized.
The pressure door seal prevents flow of cabin air to the outside.
The acoustic door seal reduces the outside noise that enters the cabin.
Training Information Point
The pressure seal depressor (not shown) on the forward side of doors one left and one right may have one or two holes in the area 40 to 50 inches above the cabin floor. These holes help control air noise. Do not block these holes. If a new depressor is installed, drill the same size holes in the same location on the new depressor.
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PASSENGER ENTRY DOOR SYSTEM -DOORS AND SEALS
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PASSENGER ENTRY DOOR SYSTEM -DOOR HINGE
Purpose
The hinge connects the door to the airplane and lets the door open and close.
Physical Description
The door hinge has these components:
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Hinge support fitting
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Hinge arm
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Lift sleeve
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Linear lift
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Door attach fitting
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Bumpers (2)
The hinge support fittings connect the hinge arm to the door cutout. The upper fitting has a sprocket for the programming chain.
The door attach fitting connects the door to the linear lift. The linear lift connects to the hinge arm. It has a sprocket for the programming chain. The programming chain is described later in this section.
Functional Description
As the door opens or closes:
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The hinge arm turns on the hinge support fittings
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The door turns and moves up and down on the linear lift.
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777 AIRCRAFT MAINTENANCE MANUAL
PASSENGER ENTRY DOOR SYSTEM -DOOR HINGE
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PASSENGER ENTRY DOOR SYSTEM -DOOR HINGE -LINEAR LIFT FUNCTION
Linear Lift Functional Description
The linear lift piston moves up and down inside the main shaft. The door counterbalance spring is inside the main shaft. It pushes the piston up.
The top of the piston connects to the door attach fitting. A slider that moves up and down on the main shaft connects to the bottom of the door attach fitting.
The force of the counterbalance spring helps the latch mechanism lift the door. The movement of the piston inside the main shaft makes sure the door lift is vertical.
Training Information Point
Do not lubricate the linear lift. Its surface includes a dry lubricant. Liquid lubricants can collect dirt.
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PASSENGER ENTRY DOOR SYSTEM -DOOR HINGE -LINEAR LIFT FUNCTION 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 Doors 舱门(7)
