777 AMM 飞机维护手册 动力装置 Power Plant PW 777 AIRCRAFT MAINTENANCE MANUAL(20)

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Lower Latch Adjustment
The latch beam, split line, and aft cowl hoop tie latches are all on the lower part of the T/R. You measure the force necessary to close these latches with a spring scale. If the force is not in the limits, you adjust the adjustment nut on the latch hook until the closing force is in the limits.
Load Share Latch Adjustment
The load share latches are on the aft, upper part of the T/R. You measure the force necessary to close these latches with a spring scale. If the force is not in the limits, you adjust the adjustment nut on the latch eye-bolt until the closing force is in the limits.
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ENGINE COWLING -THRUST REVERSER LATCH ADJUSTMENT -TRAINING INFORMATION POINTS

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PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

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POWERED DOOR OPENING SYSTEM (PDOS) -INTRODUCTION

The powered door opening system (PDOS) opens and closes the fan cowls and the thrust reversers. You can also use the PDOS to manually open and close the fan cowls and the thrust reversers.
The PDOS uses hydraulic power to open the fan cowls and the thrust reversers. Gravity closes the fan cowls and the thrust reversers.
You operate the PDOS with the actuation and control switches. Each fan cowl and each thrust reverser half has an actuation and control switch.
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POWERED DOOR OPENING SYSTEM (PDOS) -INTRODUCTION

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PDOS -GENERAL DESCRIPTION

The powered door opening system (PDOS) uses hydraulic power to open the fan cowls and the thrust reversers (T/R). It uses gravity to close them.
The PDOS has these components:
*
Actuation and control switches

*
Pump/power pack

*
Actuators.

Actuation And Control Switches
Each fan cowl and each T/R half has an actuation and control switch. Each switch has an up button and a down button. The up button opens the cowl and the down button closes the cowl. The switches permit 28v dc power to go to the pump/power pack solenoids.
Pump/Power Pack
The pump/power pack supplies hydraulic pressure to the actuators. It has a hydraulic reservoir and an electric hydraulic pump. The pump/power pack gets 115v ac power from the ground handling bus. The hydraulic fluid goes to an actuator when the related solenoid energizes.
The PDOS pump/power pack has a manual drive lug. When there is no airplane power, you can operate the solenoid valves and the manual drive lug to open the fan cowls and T/Rs. You operate only the solenoid valves to let gravity close the fan cowls and T/Rs.
　
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