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D633W101-BEJ Jan 05/2002
PASSENGER ENTRY DOOR SYSTEM -PROGRAMMING MECHANISM CHAIN
Purpose
The programming mechanism chain has these functions:
*
Correctly aligns the door to the airplane as the door opens and closes
*
Lets he door emergency power assist system (EPAS) open the door in emergencies.
Physical Description
The chain goes completely around the hinge arm.
The chain has two parts. One part of the chain connects to the snubber piston. It goes around the sprocket on the linear lift and connects to the EPAS actuator piston. The second part of the chain connects to the other end of the actuator piston. It goes around a sprocket on the hinge pin and connects to the other end of the snubber piston.
Idler sprockets let the chain follow the shape of the hinge arm.
Functional Description
The hinge arm turns on the hinge pin as the door opens and closes. The sprocket on the hinge pin does not turn. This causes the chain to move in relation to the hinge arm. The pistons of the EPAS actuator and the snubber pass the movement through to the other part of the chain.
The sprocket on the linear lift does not turn in relation to the door. The movement of the chain around the sprocket causes the door to move in relation to the hinge arm. This lets the door move forward and aft but not turn in relation to the airplane.
Training Information Point
Do not lubricate the chain. Its surface includes a dry lubricant. Liquid lubricants can collect dirt.
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D633W101-BEJ Sep 05/2002
PASSENGER ENTRY DOOR SYSTEM -PROGRAMMING MECHANISM CHAIN
EFFECTIVITY BEJ ALL 52-11-00
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D633W101-BEJ May 05/2002
PASSENGER ENTRY DOOR SYSTEM -SNUBBER
Purpose
The snubber controls the rate at which the door opens or closes.
Physical Description
The snubber attaches to the inboard side of the hinge arm. It has a piston and hydraulic fluid. The ends of the piston attach to the programming chain.
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777 AIRCRAFT MAINTENANCE MANUAL
PASSENGER ENTRY DOOR SYSTEM -SNUBBER
EFFECTIVITY BEJ ALL 52-11-00
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D633W101-BEJ Jan 05/2002
PASSENGER ENTRY DOOR SYSTEM -HOLD-OPEN MECHANISM
Purpose
The hold open mechanism holds the door in the full open position. You use the mechanism handle to pull the door closed.
Physical Description
The mechanism is on the hinge arm and has these components:
*
Handle
*
Hook
*
Catch
*
Spring
*
Push rod.
Functional Description
When the door is full open, the spring pushes the hook into the catch on the door cutout.
You pull on the handle to release the hook. The door closes if you continue to pull on the handle.
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PASSENGER ENTRY DOOR SYSTEM -HOLD-OPEN MECHANISM
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D633W101-BEJ Jan 05/2002
PASSENGER ENTRY DOOR SYSTEM -HANDLE MECHANISM AND MECHANICAL SWITCHES
Purpose
The door handle mechanism lets you open and close the door.
Physical Description
The door handle mechanism has these components:
*
Internal handle
*
Inner shaft
*
Outer shaft
*
External handle
*
External handle return spring
*
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本文链接地址：777 AMM 飞机维护手册 Doors 舱门(8)
