777 AMM 飞机维护手册 发动机排气 Engine Exhaust PW 777 AIRCRAFT MAINTENANCE MANUAL(4)

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The isolation valve (IV) and directional control valve (DCV) supply hydraulic power to the actuators.
The hydraulic actuators move the T/R sleeves to the extended or retracted position.
The sync shafts keep the movement of the hydraulic actuators together. The sync lock/manual drive unit locks the sync shafts when the sleeves are in the retracted position.
The EEC monitors the T/R sleeve position with a rotary variable differential transformer (RVDT) to control the thrust lever interlock actuator and to schedule thrust.
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ENGINE EXHAUST SYSTEM -GENERAL DESCRIPTION

*

The thrust lever interlock actuator prevents the full movement of Hydraulic power system
* PSS. position.
the reverse thrust lever until the T/R sleeves are in the correct
The test enable switch permits the operation of the TRAS for maintenance when the engine is not in operation.
The electrical load management system (ELMS) contains the TRAS relays.
Thrust Reverser Indicating and Fault Detection System

The T/R indicating and fault detection system monitors the TRAS. It uses the proximity sensor system (PSS) and the EEC to send the T/R sleeve, IV, DCV, and lock position status to the airplane information management system (AIMS).
The PSS receives signals from the actuator lock proximity sensors, the SL proximity sensors, and the proximity DCV sensor. The EEC receives signals from the RVDT and the T/R hydraulic pressure switch.
Interfaces
These are the engine exhaust system interfaces:
*
AIMS

*
ELMS

*
EEC

*
Engine data interface unit (EDIU)

 

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TURBINE EXHAUST SYSTEM -INTRODUCTION
Purpose

The turbine exhaust system makes an exit duct for the turbine exhaust.
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TURBINE EXHAUST SYSTEM -GENERAL DESCRIPTION

General

The turbine exhaust system uses a collector/nozzle to control the direction of the turbine exhaust and to make maximum thrust from the exhaust.
　
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