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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-003
THIS PAGE IS INTENTIONALLY LEFT BLANK
AVM SYSTEM - FUNCTIONAL DESCRIPTION
77-31-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
General
The AVM signal conditioner has a front panel LED display and
four BITE switches. You use the BITE switches for navigation
through the BITE menus.
GUN 111-113
The display is normally off. The display comes on when you
push any of the BITE switches and power is available. The
display goes blank again in 15 minutes if you do not push any
BITE switches.
GUN 001-099, 101-110, 115, 201-999
The LED display is normally off. The display comes on when
you push any of the four BITE switches and both engines are off.
The display goes blank if one of these happens:
* No action on the push-buttons for 5 minutes
* One or both engines start
* YES switch is pushed at the TURN OFF DISPLAY? menu.
The BITE main menu has these five items:
* SELF TEST?
* FAULT HISTORY?
* FLIGHT HISTORY?
* BALANCE?
* TURN OFF DISPLAY?.
GUN 111-113
The BITE has a main menu with these four items:
* SELF TEST?
* FAULT HISTORY?
* FLIGHT HISTORY?
* BALANCE?.
The SELF TEST menu item shows when the display first comes
on. Push the NO switch to go to the next menu item. Use the YES
switch to enter the menu item. The BITE switches with the up
arrow and down arrow are inactive at this level of the BITE
menu.
GUN 001-099, 101-110, 115, 201-999
The SELF TEST menu shows when the display first comes on.
When you push the YES push-button, the self-test starts. When
you push the NO switch, the next menu item shows. The BITE
switches with the up arrow and down arrow are inactive at this
level of the BITE menu. At the last menu, push the NO switch to
return the display to the first menu.
GUN 001-099, 101-113, 115, 201-999
Always follow the fault isolation manual (FIM) procedure and
any necessary AMM procedures when you do AVM BITE.
AVM SYSTEM - AVM SIGNAL CONDITIONER BITE - MAIN MENU - TRAINING INFORMATION POINT
EFFECTIVITY
GUN 001-099, 101-113, 115, 201-999 77-31-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
77-31-00-114
SELF TEST?
The SELF TEST? menu selection causes the AVM signal
conditioner to do an internal self test. See the SELF TEST - TIP
page that follows in this section for more information on this
part of the BITE menu.
FAULT HISTORY?
The FAULT HISTORY? menu selection lets you see fault
(maintenance) messages that are in non-volatile memory.
See the FAULT HISTORY - TIP page that follows in this section
for more information on this part of the BITE menu.
FLIGHT HISTORY?
The FLIGHT HISTORY? menu selection lets you see vibration
data for the last 32 flights (cycles) for each engine. See the
FLIGHT HISTORY - TIP page that follows in this section for more
information on this part of the BITE menu.
BALANCE?
The BALANCE? menu selection lets you do these tasks:
* See fan and LPT imbalance data for the last 6 flights (cycles)
* See and modify balance weight information in AVM nonvolatile
memory
* Make the AVM signal conditioner calculate the balance
solution for 1 plane (fan only)
* Make the AVM signal conditioner calculate the balance
solution for 2 planes (fan and low pressure turbine).
See the BALANCE - TIP pages that follows in this section for
more information this part of the BITE menu.
GUN 001-099, 101-110, 115, 201-999
TURN OFF DISPLAY?
The TURN OFF DISPLAY? menu selection lets you exit the BITE
test or go to the next menu. You exit the BITE menu and the
display goes blank when you push the YES switch. The next
menu, SELF TEST, shows when you push the NO switch.
GUN 001-099, 101-113, 115, 201-999
Training Information Point
Although the 2 plane balance is a function of the AVM signal
conditioner, it is not an approved maintenance procedure for
the CFM56-7 engine. Refer to AMMII 71-00-00.
AVM SYSTEM - AVM SIGNAL CONDITIONER BITE - MAIN MENU - TRAINING INFORMATION POINT
EFFECTIVITY
GUN 001-099, 101-113, 115, 201-999 77-31-00
Page 24
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
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