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data and fault history data:
* Use the front panel BITE and display
* Use an ARINC 429 databus analyzer and an optional test
box.
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The test box makes it easier for you to read and erase data
when you use an ARINC 429 databus analyzer. You can use the
databus analyzer without the test box.
See part 2 of the AMM or FIM for complete procedures.
GUN 001-099, 101-110, 115, 201-999
Data Access
To get access to the engine vibration data, use the BITE
switches and the front panel display. The display is activated
when you push one of the four BITE switches.
See part 2 of the AMM or FIM for complete procedures.
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AVM SYSTEM - AVM SIGNAL CONDITIONER
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General
The AVM system uses these inputs to calculate engine vibration
levels:
* N1 speed sensor
* N2 speed sensor
* No. 1 bearing vibration sensor
* Fan frame compressor case vertical (FFCCV) vibration
sensor.
The highest engine vibration level for each engine continuously
shows on the common display system (CDS). The AVM system
also keeps system fault data and historical vibration data in its
non-volatile memory.
Vibration Sensors
The vibration sensors are self-exciting piezoelectric crystals.
The sensors supply a small electrical signal output. The output
level changes when the engine structure moves in the radial
direction. The output difference is proportional to the vibration
level of the engine.
You remove and replace the no. 1 bearing vibration sensor
during an engine overhaul.
AVM Signal Conditioner
The signal conditioner uses the speed sensor inputs and the
vibration signals to calculate vibration levels for these engine
components:
* Low pressure compressor (LPC)
* High pressure compressor (HPC)
* Low pressure turbine (LPT)
* High pressure turbine (HPT).
The highest vibration signal continuously goes to the DEUs on
an ARINC 429 databus to show on the CDS. This information
also goes to the flight data acquisition unit (FDAU). The FDAU
sends the data to the flight data recorder.
The signal conditioner holds vibration data for the last 32 flights
in its non-volatile memory. A new flight starts when both
engines are less than 45 percent N2 and one engine goes more
than 45 percent N2. A flight ends when both engines are less
than 45 percent N2.
The signal conditioner also keeps AVM system fault codes in its
non-volatile memory.
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You use the BITE switches and display on the face of the signal
　
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