777 AMM 飞机维护手册 发动机指示 Engine Indicating PW 777 AIRCRAFT MAINTENANCE MANUAL(13)

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The No. 1 bearing accelerometer connector is on the fan frame hub at the 7:00 position. The No. 1 bearing accelerometer is inside the engine. The E-flange accelerometer is on the
intermediate  case  at  the  10:30  position.  The  P-flange 
accelerometer is  on  the tur bine exhaust  case  at  the 9:00 
position. 

The accelerometers make electrical charge signals that change in proportion to the engine vibration level. The signals go to the RCC.
Remote Charge Converter
The RCC amplifies accelerometer charge signals and changes the signals into voltage signals. It sends the voltage signals to the AVM signal conditioner unit.
The RCC is in the engine strut. You remove the forward No. 3 fairing to get access to it.
The RCC has self-test circuits to continually monitor vibration amplitude and phase accuracy.
EFFECTIVITY BEJ ALL  77-31-00 
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ENGINE INDICATING -AVM -ACCELEROMETERS AND REMOTE CHARGE CONVERTER

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ENGINE INDICATING -AVM -SIGNAL CONDITIONER UNIT

General
The AVM signal conditioner unit uses vibration and speed signals from engine sensors to calculate engine vibration levels. The signal conditioner unit also does these functions:
*
Compares the N1 and N2 vibration levels to find which is highest

*
Keeps in memory the vibration data for the last six flight legs

*
Calculates engine balance solutions

*
Self-test.

Each engine has one AVM signal conditioner unit. The signal conditioner units are in the main equipment center.
Maintenance Connector
The AVM signal conditioner unit has a maintenance connector on the front. The maintenance connector supplies alternative access for the engine balancing system (EBS) and for data loading. Normal access for these functions is on the MAT.
EFFECTIVITY BEJ ALL  77-31-00 
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ENGINE INDICATING -AVM -SIGNAL CONDITIONER UNIT

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ENGINE INDICATING -AVM -FUNCTIONAL DESCRIPTION

General
The AVM system uses vibration and speed signals to calculate engine vibration data and engine balancing system (EBS) data.
Accelerometers
The three engine accelerometers make electrical charges from engine vibration in the radial direction. They send signals proportional to engine vibration to the RCC.
Remote Charge Converter
The RCC changes the accelerometer charge signals into voltage signals. The RCC amplifies the signals and sends them to the AVM signal conditioner unit.
　
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