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AVM SYSTEM - AVM SIGNAL CONDITIONER
AVM SYSTEM - AVM SIGNAL CONDITIONER
EFFECTIVITY
GUN 001-099, 101-110, 115, 201-999 77-31-00
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-002
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AVM SYSTEM - AVM SIGNAL CONDITIONER
77-31-00
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D633A101-GUN Jun 10/2006
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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.
AVM SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 77-31-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-003
You use the BITE switches and display on the face of the signal
conditioner to navigate through its BITE menus. You can see or
erase fault data and in-flight vibration data. You also use the
BITE to make the AVM signal conditioner calculate an engine
balance solution. See the training information point pages in
this section for more information about the BITE.
GUN 111-114
You can also get data or erase data with a data bus analyzer.
See the section on the AVM signal conditioner for more
information.
GUN ALL
The program pins identify the engine model and the customer
options.
The signal conditioner gets electrical power from the 115v ac
transfer bus 2. An internal power supply changes the input to
24v dc.
AVM SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 77-31-00
Page 18
D633A101-GUN Jun 10/2006
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-003
AVM SYSTEM - FUNCTIONAL DESCRIPTION
AVM SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 111-113 77-31-00
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D633A101-GUN Jun 10/2006
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-003
AVM SYSTEM - FUNCTIONAL DESCRIPTION
AVM SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 114 77-31-00
Page 20
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-003
AVM SYSTEM - FUNCTIONAL DESCRIPTION
AVM SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-110, 115, 201-999 77-31-00
Page 21
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
　
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