PASSENGER ENTRY DOOR SYSTEM -LATCH MECHANISM -LATCH CRANK FUNCTION
EFFECTIVITY BEJ 008-999; BEJ 001-007 POST SB 777-52-0031 52-11-00
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PASSENGER ENTRY DOOR SYSTEM -LATCH MECHANISM -LATCH CRANK FUNCTION
EFFECTIVITY BEJ 001-007 PRE SB 777-52-0031 52-11-00
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777 AIRCRAFT MAINTENANCE MANUAL
THIS PAGE IS INTENTIONALLY LEFT BLANK
52-11-00
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PASSENGER ENTRY DOOR SYSTEM -LATCH MECHANISM -SECONDARY LIFT FUNCTION
Functional Description
The secondary lift works with the door attach fitting and the lift sleeve.
The lift plate is part of the lift sleeve. The lift sleeve is held by the hinge arm. It can turn but cannot move up and down.
The secondary lift roller arm connects to the door attach fitting. The roller fits above the lift sleeve lift plate.
Rotation of the latch torque tube to open the door, pulls down on the secondary lift. The roller arm roller pushes down on the lift plate. This causes the outboard end of the roller arm to moves up. This lifts the door attach fitting which lifts the door.
When the door is closed, the secondary lift works against aerodynamic forces or airplane movement that try to lift the door. When the door lifts on the end of the roller arm, the roller arm pushes down on the push rod. The rod push on the torque tube rotates the tube in the door close direction.
EFFECTIVITY BEJ ALL 52-11-00
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PASSENGER ENTRY DOOR SYSTEM -LATCH MECHANISM -SECONDARY LIFT FUNCTION
EFFECTIVITY BEJ ALL 52-11-00
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PASSENGER ENTRY DOOR SYSTEM -VENT DOOR MECHANISM -INTRODUCTION
Purpose
The vent door mechanism:
*
Releases pressurization to prevent damage when the passenger entry door opens
*
Will not let the passenger entry door unlatch if differential pressurization is above 0.21 psi.
Physical Description
The vent door mechanism has these components:
*
Vent door
*
Interlock rod
*
Interlock roller arm
*
Interlock cam
*
Drive rod
*
Spring (3)
*
Hinge shaft.
Functional Description -Vent Door
In the passenger entry door closed position, the drive rod holds the vent door closed. The initial movement of the door handle pulls down on the drive rod which releases the vent door. The springs open the vent door if differential pressurization is below
0.125 psi.
When the vent door opens the interlock rod pushes down on the roller arm. The roller arm moves the roller away from the interlock cam so the cam will let the latch torque tube turn.
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PASSENGER ENTRY DOOR SYSTEM -VENT DOOR MECHANISM -INTRODUCTION
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PASSENGER ENTRY DOOR SYSTEM -VENT DOOR MECHANISM -INTERLOCK FUNCTION
Pressurization Lockout Function
When differential pressurization is above 0.125 psi, the vent door springs cannot open the vent door. The interlock rod continues to hold the interlock roller arm up. The interlock roller will not let the interlock cam turn. The latch torque tube cannot turn to unlatch the passenger entry door. 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(10)
