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 THE CONTINUE? SECONDARY EIS, N183 (AMM 31-42-02/401).
NO

YES
NO

2 PRESS AND RELEASE THE
26 DISCONNECT THE ELECTRICAL
46 EXAMINE THE CIRCUIT
"TEST" BUTTON 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?
YES

YES

3 THE DISPLAY WILL SHOW 88

BRIEFLY.
UPON A SUCCESSFUL TEST COMPLETION, THE DISPLAY WILL BE BLANK.
 DOES 88 REMAIN ON OR CODE A9 SHOW?
NO

SEE SHEET 8 (BLOCK 4)
AVM Indication Problem Figure 104 (Sheet 7)
F64697
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 7
(BLOCK 3)
NO

YES

4 INTERROGATE THE AVM SIGNAL

SEE SHEET 9
CONDITIONER TO GET THE BITE (BLOCK 55)
MAINTENANCE MESSAGES (AMM 77-31-00/201). ARE THERE BITE MAINTENANCE MESSAGES PRESENT?

NO
YES
5 SWAP THE AVM INDICATORS,
49 REPLACE THE AVM INDICATOR, N160 OR N161 N160 OR N161 (AMM 77-31-04/401), OR DO THE (AMM 77-31-04/401), OR THE BITE PROCEDURE FOR THE SECONDARY EIS, N183 SECONDARY EIS, N183 (AMM 31-42-02/401). (AMM 23-42-00/501).
DOES THE DISCREPANCY FOLLOW THE INDICATOR OR ARETHERE FAULTS DETECTED?

NO YES YES

6 INTERROGATE THE AVM SIGNAL 27 INSTALL THE ALTERNATE 50 EXAMINE THE WIRING AND
CONDITIONER TO GET THE RECENT NO. 1 BEARING (NOB) VIBRATION CONNECTORS BETWEEN THE AVM
FLIGHT HISTORY (FFCCV) SENSOR, T332 SIGNAL CONDITIONER, M1240 AND
(AMM 77-31-00/201). (AMM 77-31-01/401). THE FFCCV SENSOR, T332

DOES THE FLIGHT HISTORY DOES THE HIGH VIBRATION (WDM 77-31-11). CONSISTENTLY SHOW HIGHCONTINUE TO SHOW UP ON ONE ORVIBRATION OR "00" ON ONE OR TWO OF CN1 OR CN2? TWO OF CN1 OR CN2?
NO
____IT IS POSSIBLE THAT THE
NOTE: FLIGHT HISTORY WILL DISPLAY "00" FOR ALL PARAMETERS FOR ONE OR TWO ENGINES AND NOT HAVE AN AVM INDICATION SYSTEM ANOMALY.

NO YES YES

7 INTERROGATE THE AVM SIGNAL 28 REPLACE THE TRF VIBRATION 52 EXAMINE THE WIRING AND
CONDITIONER TO GET THE RECENT (CORE) SENSOR, T331 CONNECTORS BETWEEN THE AVM
FLIGHT HISTORY (AMM 77-31-02/401). SIGNAL CONDITIONER, M1240 AND
(AMM 77-31-00/201). DOES THE HIGH VIBRATION THE CORE SENSOR, T331

DOES THE FLIGHT HISTORY CONTINUE TO SHOW UP ON ONE OR(WDM 77-31-11). CONSISTENTLY SHOW HIGHTWO OF TN1 OR TN2? VIBRATION OR "00" ON ONE OR
NO
TWO OF TN1 OR TN2?
____IT IS POSSIBLE THAT THE
NOTE: FLIGHT HISTORY WILL DISPLAY "00" FOR ALL PARAMETERS FOR ONE OR TWO ENGINES AND NOT

NO
HAVE AN AVM INDICATION
54 EXAMINE THE WIRING AND
SYSTEM ANOMALY.  AVM SIGNAL CONDITIONER, M1240 SECONDARY EIS, N183 AND THE INDICATOR, N160 OR N161, OR CONNECTORS BETWEEN THE AVM (WDM 77-31-11). 
Figure 104 (Sheet 8) AVM Indication Problem 

L03318
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 71-00-54
 SIGNAL CONDITIONERS, WITH AND WITHOUT ú EIS ú C02 Page 118 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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