777 AMM 飞机维护手册 发动机排气 Engine Exhaust PW 777 AIRCRAFT MAINTENANCE MANUAL(13)

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Rubstrips are mounted on the circumference of the torque box as a wear surface for the fan cowl panels and the translating sleeves.
The inner wall (or fan duct cowl) provides part of the duct for the fan air exhaust. The inner wall also covers engine core.
Aft Cowl
The aft cowl is located at the aft end of the fan duct cowl and there is a left and right aft cowl for each engine. The each aft cowl has two pressure relief doors, bulb-type fire seals, a hoop-tie strap and tension latch, a load share strap and tension latch, frame assemblies and the skin panels. Two tension latches are mounted on the on the left aft cowl and two latch hook bolts are mounted on the right aft cowl. There are no hydraulic and electronic components in the aft cowl.
The primary purpose of the aft cowl assembly is to provide a load share structure for the engine and also to provide a smooth surface for the fan air which exits the fan duct.
The one piece bulb type fire seal on the thrust reverser upper bifurcation extends aft to the aft cowl. These fire seals help to contain an under cowl fire.
The aft cowl covers the turbine exhaust case of the engine. There are two types of aft cowl structures; the first type is a conventional skin with frames and stringers which are held together with fasteners. The second type uses an waffle-grid structure which reduces the number of fasteners and stringers. The waffle-grid structure superseded the conventional structure.

EFFECTIVITY BEJ ALL  78-31-00 
Page 13 
D633W101-BEJ  Jan 05/2004 

 

THRUST REVERSER SYSTEM -COMPONENTS

There are two pressure relief doors on each aft cowl. The pressure relief doors are hinged to open to release the under cowl air pressure from a duct burst when the pressure exceeds the door latch load.
The load share and hoop-tie straps fit in the channel formed by the frames mounted on the aft cowl. The forward hoop-tie straps are connected to support rod that is suspended from brackets mounted on the bottom of the strut. The aft load share straps are connected to a cross-tie assembly that is mounted on the engine turbine case located aft of the aft engine mount. The hoop-tie support rod is adjusted to the correct length when they are installed or replaced and are not adjusted in-service.
There are stop plates on the tension latch housings on the left and right aft cowls. The stop plates are adjusted with shims.
EFFECTIVITY BEJ ALL  78-31-00 
Page 14 
D633W101-BEJ  Jan 05/2004 

PW4000 SERIES ENGINES

 

777 AIRCRAFT MAINTENANCE MANUAL

 

THRUST REVERSER SYSTEM -COMPONENTS

EFFECTIVITY BEJ ALL  78-31-00 
Page 15 
D633W101-BEJ  May 05/2003 

 

THRUST REVERSER SYSTEM -TENSION LATCHES

General

Tension latches hold the left and right thrust reverser (T/R) halves together. There are four types of tension latches:
　
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