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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-000
AIRBORNE VIBRATION MONITORING (AVM) SYSTEM - GENERAL DESCRIPTION
AIRBORNE VIBRATION MONITORING (AVM) SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 111-113 77-31-00
Page 3
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
77-31-00-000
AIRBORNE VIBRATION MONITORING (AVM) SYSTEM - GENERAL DESCRIPTION
AIRBORNE VIBRATION MONITORING (AVM) SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 114 77-31-00
Page 4
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
77-31-00-000
AIRBORNE VIBRATION MONITORING (AVM) SYSTEM - GENERAL DESCRIPTION
AIRBORNE VIBRATION MONITORING (AVM) SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-110, 115, 201-999 77-31-00
Page 5
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
77-31-00-000
General
The AVM system has two vibration sensors (accelerometers)
on the engine and one signal conditioner in the EE
compartment.
Vibration Sensors
The number 1 bearing vibration sensor is inside the engine.
You cannot see this sensor with the engine on the airplane. You
get access to this sensor during engine overhaul. An electrical
connector attaches to this sensor wiring at the fan case. This
connection is aft of the engine oil tank, just above the engine
nameplate.
The fan frame compressor case vertical (FFCCV) vibration
sensor is on the rear fan frame at the 3:00 position. You open
the right fan cowl and the right thrust reverser cowl to get
access to this sensor.
AVM Signal Conditioner
The AVM signal conditioner is on the E3-2 shelf.
AVM SYSTEM - COMPONENT LOCATION
EFFECTIVITY
GUN ALL 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
77-31-00-001
AVM SYSTEM - COMPONENT LOCATION
AVM SYSTEM - COMPONENT LOCATION
EFFECTIVITY
GUN 111-113 77-31-00
Page 7
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
77-31-00-001
AVM SYSTEM - COMPONENT LOCATION
AVM SYSTEM - COMPONENT LOCATION
EFFECTIVITY
GUN 114 77-31-00
Page 8
D633A101-GUN Jun 10/2006
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-001
AVM SYSTEM - COMPONENT LOCATION
AVM SYSTEM - COMPONENT LOCATION
EFFECTIVITY
GUN 001-099, 101-110, 115, 201-999 77-31-00
Page 9
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-001
Purpose
The AVM signal conditioner has these functions:
* Calculates vibration of each engine and supplies a signal to
the common display system (CDS)
* Keeps historical engine vibration data in memory for each
engine
* Gives you vibration balance solutions that help you do
engine trim balance operations
* Isolates AVM system failures and keeps failure data in
memory.
General
The front face of the AVM signal conditioner has BITE that lets
you do these functions:
* See or erase fault history data
* See or erase flight history data
* Operate the balance function
* Start an internal self test of the AVM signal conditioner.
The red LED display shows up to 3 lines of data, 8 characters
wide. See the AVM SIGNAL CONDITIONER BITE -TIP pages in
this section for more information.
Vibration Calculations
The AVM signal conditioner continuously calculates vibration
data for several areas of each engine. The highest vibration for
each engine shows on the CDS.
The AVM signal conditioner uses inputs from these components
to calculate vibration levels:
* Vibration sensors (2)
* N1 speed sensor
* N2 speed sensor.
The AVM signal conditioner continuously calculates vibration
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