55 RECORD EACH BITE MAINTENANCE MESSAGE THAT SHOWS UNTIL THE DISPLAY SHOWS FF. DO THE ACTION THAT
FOLLOWS EACH BITE MAINTENANCE MESSAGE.

____ RECORD EACH BITE MAINTENANCE MESSAGE BEFORE YOU PUSH THE "DATA" BUTTON AGAIN. EACH PUSH OF THE
NOTE:"DATA" BUTTON WILL SHOW YOU A NEW BITE MAINTENANCE MESSAGE AND WILL ERASE ALL THE BITE MAINTENANCE MESSAGES AFTER THE LAST BITE MAINTENANCE MESSAGE SHOWS.
PIN CONNECTIONS MUST BE COMPLETELY CLEANED TO CORRECT OR PREVENT AVM INDICATION PROBLEMS BEFORE YOU RECONNECT THEM.

* INCLUDES CONNECTORS ON ALL WIRING AND SHIELD ON VIBRATION SENSOR WIRING
AVM Indication Problem
Figure 104 (Sheet 9)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH S360N021-201 OR -202 AVM ú

 71-00-54
 SIGNAL CONDITIONERS  ú ú C02 Page 119 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
AVM INDICATION PROBLEM
PREREQUISITES
MAKE SURE THESE CIRCUIT BREAKERS ARE CLOSED: ENG VIBRATION MONITOR AIRPLANES WITH ENGINE INSTRUMENTATION SYSTEM (EIS); EIS SEC 1, EIS SEC 2, EIS SEC 3, EIS SEC 4;AIRPLANES WITH -201 EIS, PRESS IND SYS A,
PRESS IND SYS B;
AIRPLANES WITH -202 EIS, EIS SEC 5, EIS SEC 6

MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201)
EQUIPMENT: BRISTLE BRUSH
CONSUMABLE MATERIALS: STODDARD SOLVENT (CP 2011)
YES

1 DO THE VIBRATION
INDICATORS, N160 OR N161,
POINT TO THE BLUE LINE OR DOES
THE SECONDARY EIS, N183 SHOW A
BLANK DISPLAY OR ARE THERE LOG
BOOK REPORTS FOR SUCH
BEHAVIOR?

NO
SEE SHEET 11 (BLOCK 2)

43 DISCONNECT THE NO. 1
VIBRATION GREATER THAN 4 UNITS OF LESS THAN ONE MINUTE IN DURATION THAT REPEATED DURING THE FLIGHT OR ON SUBSEQUENT FLIGHTS?

NO SEE SHEET 11 (BLOCK 24)
AVM Indication Problem
Figure 104 (Sheet 10)

BEARING HARNESS FROM THE NO. 1 BEARING SENSOR, T332 AND THE TRF VIBRATION HARNESS FROM THE TRF SENSOR, T331.
EXAMINE THE RECEPTACLES AND CONNECTORS FOR DAMAGEDPINS AND CONTAMINATION OF THE PARTS THAT FOLLOW: . HARNESS CONNECTORS . VIBRATION SENSORS CONNECTORS
(AMM 77-31-02/601). . AVM
IF DAMAGED PINS ORCONNECTOR OXIDATION IS FOUND, REPAIR THE CIRCUIT IF IT IS NECESSARY (WDM 77-31-11).
 IF NO DAMAGE IS FOUND, CLEAN THE CONNECTORS WITH A BRISTLE BRUSH AND STODDARD SOLVENT (CP 2011).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. úAIRPLANES WITH S360N021-113 AVM SIGNAL ú

 71-00-54
 úCONDITIONERS, WITH AND WITHOUT EIS  ú ú C01.1 Page 120 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 10 FROM SHEET 10 (BLOCK 1) (BLOCK 23)

NO NO

YES
44 EXAMINE THE CIRCUIT BETWEEN THE AVM SIGNAL CONDITIONER, M1240, AND THE AVM INDICATORS, N160 OR N161

NO
OR THE SECONDARY EIS, N183.
EXAMINE THE CIRCUIT BETWEEN THE AVM SIGNAL CONDITIONER, M1240, AND THE ENG VIBRATION MONITOR CIRCUIT BREAKER (WDM 77-31-11).
YES
25 REPLACE THE AVM INDICATOR,

REPAIR THE CIRCUIT IF IT IS
N160 OR N161 NECESSARY.
(AMM 77-31-04/401), OR THE IF THE PROBLEM CONTINUES,
SECONDARY EIS, N183 REPLACE THE AVM INDICATOR,
(AMM 31-42-02/401). N160 OR N161

DOES THE DISCREPANCY (AMM 77-31-04/401), OR THECONTINUE?SECONDARY EIS, N183 (AMM 31-42-02/401).
NO
YES NO

2 PRESS AND RELEASE ONE OF
26 DISCONNECT THE ELECTRICAL
46 EXAMINE THE CIRCUIT
THE FOUR BUTTONS ON THE AVM CONNECTOR, D3228C FROM THE AVM BETWEEN THE AVM SIGNAL
SIGNAL CONDITIONER FOR THE SIGNAL CONDITIONER CONDITIONER, M1240, AND THE
SELF TEST (AMM 77-31-00/501).(WDM 77-31-11). ENG VIBRATION MONITOR CIRCUIT

IS THE DISPLAY BLANK? MEASURE FOR 115V AC AT BREAKER (WDM 77-31-11). CONNECTOR, D3228C, PIN 2
NO
(PIN 4, GROUND). IS 115V AC PRESENT?
　
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