PASSENGER ENTRY DOOR SYSTEM -INTRODUCTION
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777 AIRCRAFT MAINTENANCE MANUAL
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PASSENGER ENTRY DOOR SYSTEM -COMPONENT LOCATIONS -WITH DOOR LINERS REMOVED
Components on the Inside of the Door -Lining Removed
The vent door mechanism is near the top of the door.
The mode select mechanism is on the forward, upper part of the door. The girt bar mechanism is on the bottom of door. The push/pull cable connects the mode select mechanism and the girt bar mechanism.
The door hinge connects the middle of the door to the forward side of the door cutout.
These components are on the door hinge:
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Programming chain mechanism
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Snubber
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Hold-open mechanism
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Emergency power assist system (EPAS) battery
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EPAS reservoir
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EPAS actuator.
The EPAS actuator does not show in this view. It is on the outboard side of the door hinge.
Components Outboard of the Door Hinge
The flight lock mechanism is near the forward edge of the door. It connects to the Latch mechanism.
The door handle mechanism is near the middle of the door. It connects to the latch mechanism and the vent door mechanism.
The latch mechanism goes across the middle of the door. It connects to the handle mechanism and the vent door mechanism.
Proximity Sensors and Mechanical Switches
The proximity sensors on the aft door latch and the vent door are components of the door warning system. See the door warning section for more information on the door warning system (SECTION 52-71). The proximity sensors (not shown) on the flight lock mechanism are components of the door system.
The EPAS uses these two mechanical switches:
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The mode select switch on the mode select mechanism
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The door open switch on the door handle mechanism.
Door Open Sequence
Movement of the lever on the mode select mechanism disarms the escape slide/raft and EPAS. The mode select switch on the mechanism is the component that disarms the EPAS. The push/ pull cable transmits mode select lever movement to the girt bar mechanism.
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PASSENGER ENTRY DOOR SYSTEM -COMPONENT LOCATIONS -WITH DOOR LINERS REMOVED
The door handle mechanism lets you unlatch the passenger entry door. The mechanical switch on the mechanism starts the EPAS if the mode select mechanism is in the armed position.
The vent door mechanism releases pressurization before the passenger entry door can unlatch completely. It also locks the latch mechanism if pressurization is too high for safe passenger entry door operation.
The latch mechanism lifts and unlatches the door.
The door moves up past the stops on the cutout and translates open on the hinge.
The programming chain mechanism keeps the inside of the door parallel to the airplanes longitudinal axis as the door opens.
The snubber controls the rate of movement of the door.
The hold-open mechanism holds the door in the completely open position.
The EPAS moves the door open in emergencies.
The girt bar mechanism locks the emergency escape slide/raft to the bottom of the door cutout when you open the door in emergencies.
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PASSENGER ENTRY DOOR SYSTEM -COMPONENT LOCATIONS -WITH DOOR LINERS REMOVED
EFFECTIVITY BEJ ALL 52-11-00 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(6)
