(i)  
Push and release the TEST button to stop the flight history.

 NOTE: The TEST button will start a self test and turns the
____ display off. This puts the AVM signal conditioner back to its standby mode.
 (j)  If there are high vibrations, do the troubleshooting that shows for High Vibration Indication (AMM 71-00-47/101).
 S 412-028-C00
 (2)  Close the electronic equipment access door, 1201L.
 TASK 77-31-00-972-031-C00
 3.  AVM SIGNAL CONDITIONER ENDEVCO S360N021-201, -202; Airborne Vibration Monitoring (AVM) System - System Test
________________________________________________________
 A.  General
 (1)  This is the system test procedure for the airborne vibration monitoring (AVM) signal conditioner.
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(2)  
Use this procedure for the AVM signal conditioner with this part number:

 (a)  
Boeing part number - S360N021-201, -202.

 (b)  
Vendor part number - Endevco 6672M201, 6672M202.

 (3)  
This AVM signal conditioner has a two (2) character display.

 (4)  
This procedure uses the Built-In Test Equipment in the AVM signal conditioner.

 (5)  
The AVM signal conditioner shows the Built-In Test Equipment Maintenance Messages first and then the flight history.

 (6)  
This procedure refers to the Built-In Test Equipment as the BITE.

 B. References
 (1)  
AMM 71-00-47/101, High Vibration Indication

 (2)  
AMM 71-00-54/101, AVM Indication Problem

 C. Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 D. Prepare to Read the BITE Maintenance Messages and the Flight History
 S 862-039-C00
 (1)  Make sure this circuit breaker on the circuit breaker panel, P6, is closed.
 (a)  ENG VIBRATION MONITOR
 S 012-034-C00
 (2)  Open the electronic equipment access door, 1201L.
 E. Read the BITE Maintenance Messages
 S 972-035-C00
 (1)  Do these steps to read the BITE Maintenance Messages:
 NOTE: If BITE Maintenance Messages are to be saved, you must record
____ them before you read the flight history. Flight history can not be read unless all BITE maintenance messages are deleted.
 (a)  Find the DATA button on the front of the AVM signal conditioner.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CAUTION:_______ RECORD THE BITE MAINTENANCE MESSAGES BEFORE YOU PUSH THE
 DATA BUTTON AGAIN.  YOU WILL ERASE ALL THE BITE
 MAINTENANCE MESSAGES WHEN YOU PUSH THE DATA BUTTON AFTER
 THE LAST BITE MAINTENANCE MESSAGE.  WHEN YOU READ FF, ALL
 BITE MAINTENANCE MESSAGES WERE DISPLAYED AND ONE MORE PUSH

 OF THE DATA BUTTON WILL DISPLAY THE FLIGHT HISTORY.
 (b)  Push and release the DATA button to show the most recent BITE maintenance message that was set.
 NOTE: You will have no indication of the total number of BITE
____ maintenance messages before they are erased. There are 5 different BITE maintenance messages. The AVM signal conditioner can keep 32 BITE maintenance messages in the storage memory. Each BITE maintenance message is recorded in the order of occurance.
 ~................................................................ | BITE MAINTENANCE MESSAGES | .................................................................. | MAINTENANCE MESSAGES | DESCRIPTION | .................................................................. | A9 | SELT TEST FAILURE | .................................................................. | B1 | SIGNAL LOSS - TACH N1, ENG 1 | .................................................................. | B2 | SIGNAL LOSS - TACH N2, ENG 1 | .................................................................. | B3 | SIGNAL LOSS - TACH N1, ENG 2 | .................................................................. | B4 | SIGNAL LOSS - TACH N2, ENG 2 | 2......................….........................................1
　
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