777 AMM 飞机维护手册 Equipment and Furnishings(36)

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Packboard
The packboard is a composite tray (Kevlar honeycomb) which attaches to the door with two fittings and a latch. Fabric lacing covers hold the folded slide/raft in the packboard until released by the cover release mechanism. When the release mechanism opens, the folded slide/raft falls out of the packboard.
Slide/Raft
The slide/raft is an inflatable structure made of coated Nylon fabric. Upper and lower air chambers support the slide/raft floor. An inflation cylinder and two aspirators inflate the air chambers. A manual handle (not shown) operates the inflation mechanism if the slide/raft fails to inflate automatically. Relief valves (not shown) keep internal pressure to a limit.
The girt and girt bar attach the slide/raft to the airplane doorway. The girt is part of the escape slide. Speed-lacing attaches the girt to the girt bar. After ditching, remove the speed-lacing to release the inflated slide/raft from the airplane.
EFFECTIVITY BEJ ALL  25-66-00 
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D633W101-BEJ  Sep 05/2002 

 

DOOR-MOUNTED ESCAPE SYSTEM -ESCAPE SLIDE PACK -INTRODUCTION

EFFECTIVITY BEJ ALL  25-66-00 
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D633W101-BEJ  Jan 05/2002 

DOOR-MOUNTED ESCAPE SYSTEM -ESCAPE SLIDE PACK -PACKBOARD FUNCTIONAL DESCRIPTION

Cover Release
Tension on the girt pulls on the cover release cable. The cable disengages the disc from the release mechanism. The shaft rotates and causes the pins to release the lacing cover ball ends. With the bottom of the lacing cover released from the packboard, the folded slide/raft falls away from the packboard.
Training Information Point
A lanyard attaches a safety pin to the lacing cover. Install the pin to lock the release mechanism during removal or installation of the escape slide pack. When you return the airplane to its usual condition, be sure to remove the pin from the release mechanism. The inboard side of the lacing cover has a stowage pouch for the pin.
EFFECTIVITY BEJ ALL  25-66-00 
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D633W101-BEJ  Jan 05/2002 

 

DOOR-MOUNTED ESCAPE SYSTEM -ESCAPE SLIDE PACK -PACKBOARD FUNCTIONAL DESCRIPTION

EFFECTIVITY BEJ ALL  25-66-00 
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D633W101-BEJ  Jan 05/2002 

DOOR-MOUNTED ESCAPE SYSTEM -ESCAPE SLIDE PACK -SLIDE/RAFT FUNCTIONAL DESCRIPTION

Slide/Raft Inflation
The inflation cylinder holds a mixture of carbon dioxide and nitrogen at 3000 psig. A gage shows how much pressure is in the cylinder. A pressure relief valve protects the cylinder from excessive pressure. The relief valve opens at 4500 psig. A fusible plug protects the inflation cylinder from high temperatures. The plug opens at 174F (79C).
Tension on the inflation cable rotates the inflation valve to the open position. The pressure regulator (internal) reduces the pressure to 550 psig. Gas flows through the hoses, check valves, aspirator nozzles, then into the slide raft air chambers.
The gas flow through the aspirator nozzle creates a venturi effect in the aspirator. The flapper valve opens and ambient air flows through the aspirator to help inflate the slide/raft.
When pressure inside the slide/raft reaches a specified value, the flapper valves close. Gas continues to flow from the cylinder into the slide raft. When the slide/raft is at the correct operating pressure (2.6 psig), relief valves open to prevent overpressurization.
Training Information Point
Hold the aspirator flapper valves open to deflate the slide/raft after an inflation test.
You must install the safety pin to lock the inflation valve during removal or installation of the escape slide pack. When you return the airplane to its usual condition, be sure to remove the pin from the valve. The slide pack lacing cover has a stowage pouch for the pin.
The pressure gage makes allowance for temperature changes. The pointer moves with pressure changes. The green band moves with temperature changes. If the pointer is within the green band, the cylinder pressure is correct for the cylinder temperature.
EFFECTIVITY BEJ ALL  25-66-00 
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D633W101-BEJ  Sep 05/2002 

 

DOOR-MOUNTED ESCAPE SYSTEM -ESCAPE SLIDE PACK -SLIDE/RAFT FUNCTIONAL DESCRIPTION

EFFECTIVITY BEJ ALL  25-66-00 
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D633W101-BEJ  Jan 05/2002 

DOOR-MOUNTED ESCAPE SYSTEM -BUSTLE

Purpose
The bustle is the door lower liner. It is a cover for the slide/raft and makes the installation look good.
Physical Description
The bustle is a crushed core shell covered on both sides with graphite composite. Tedlar laminate covers the inboard side. A window in the bustle lets you see the slide pack pressure gauge. Rubstrips protect the bustle from galley service carts.
Two latches hold the top of the bustle to the door. The latches have a hinge which allows the bottom of the bustle to move inboard. Alignment fittings hold the bottom of the bustle in position against the door.
　
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