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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
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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 001-099, 101-110, 115, 201-999 77-31-00
Page 9
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
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
for these engine areas:
* Fan/low pressure compressor (LPC)
* High pressure compressor (HPC)
* High pressure turbine (HPT)
* Low pressure turbine (LPT).
Engine Vibration Data History
The AVM signal conditioner holds engine vibration data
information for the last 32 flights (engine cycles) of each
engine. A new flight starts when one engine speed is more than
45 percent N2. The flight stops when both engines go less than
45 percent N2. You can see this data in the FLIGHT HISTORY
MENU on the display. See the FLIGHT HISTORY - TIP page in
this section for more information.
AVM SYSTEM - AVM SIGNAL CONDITIONER
EFFECTIVITY
GUN ALL 77-31-00
Page 10
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
Balance Function
The AVM signal conditioner uses engine vibration data
(historical) in non-volatile memory to calculate one-plane (fan)
and two-plane (fan and LPT) balance solutions. You use the
BITE display and switches to operate the balance function and
to see the solutions. See the BALANCE - TIP pages in this
section for more information.
GUN 001-099, 101-113, 115, 201-999
AVM System BITE and Fault History
A test occurs each time the AVM signal conditioner gets initial
electrical power or when you start a test from the SELF TEST
MENU on the display. See the SELF TEST - TIPS page in this
section for more information.
The AVM signal conditioner does a test to monitor these items:
* Internal circuits
* N1 signal from engine 1 and engine 2
* N2 signal from engine 1 and engine 2.
The AVM signal conditioner keeps up to 32 fault (maintenance)
messages in its non-volatile memory. You can see this data on
the display in the FAULT HISTORY MENU. See the FAULT
HISTORY - TIP page in this section for more information.
GUN 114
AVM System BITE and Fault History
A test occurs each time the AVM signal conditioner gets initial
electrical power or when you start a test from the SELF TEST
menu on the display. See the SELF TEST - TIPS page in this
section for more information.
The AVM signal conditioner does a test to monitor these items:
* Internal circuits
* N1 signal from engine 1 and engine 2
* N2 signal from engine 1 and engine 2.
The AVM signal conditioner keeps fault (maintenance)
messages in its non-volatile memory. You can see this data
on the display in the SYSTEM FAULTS menu. See the SYSTEM
FAULTS - TIP page in this section for more information.
GUN 111-114
Data Access
These are the two methods to see or erase the engine vibration
　
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