BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1(BLOCK 1)
NO YES NO

20 DEPRESSURIZE THE A (B)
41 OPEN THE CIRCUIT BREAKER HYDRAULIC SYSTEM. "ENG 1 THRUST REV CONT" WAIT A MINIMUM OF ("ENG 2 THRUST REV CONT" AND
NO
30 SECONDS."ENG 2 THRUST REV CONT-ALTN"). DOES THE "REVERSER" LIGHT
REMOVE THE ENGINE ACCES-SEE SHEET 4 GO OFF?SORY UNIT, M528, FROM THE E3(BLOCK 3) RACK.

YES
CLOSE THE CIRCUIT BREAKER
"ENG 1 THRUST REV CONT"21 OPEN THE CIRCUIT BREAKER ("ENG 2 THRUST REV CONT" AND "ENG 1 SYNC LOCK" ("ENG 2 SYNC "ENG 2 THRUST REV CONT-ALTN"). LOCK" AND "ENG 2 SYNC LOCK-
DO A CHECK FOR 28V DC ALTN"). BETWEEN CONNECTOR D1458A DISCONNECT THE L (R) (D1458B), PIN 21, AND GROUND.SLEEVE SYNC LOCK, CONNECTOR
 IF THERE IS 28V DC, D1008 OR D1016. REPLACE THE ENGINE ACCESSORY CLOSE THE CIRCUIT BREAKER UNIT, M528 (AMM 78-34-06/401). "ENG 1 SYNC LOCK" ("ENG 2 SYNC
IF THERE IS NOT 28V DC, LOCK" AND "ENG 2 SYNC LOCK-EXAMINE THE CIRCUIT FROM THEALTN"). ENGINE ACCESSORY UNIT, M528,
MOVE THE REVERSE THRUSTCONNECTOR D1458A (D1458B), LEVER FROM THE STOW POSITION,PIN 21, TO THE CONTROL CIRCUIT THEN PUT IT BACK IN THE STOW BREAKER. POSITION. REPAIR THE PROBLEMS THAT
IN LESS THAN 120 SECONDS YOU FIND. FROM THE TIME YOU PUT THEREVERSE THRUST LEVER BACK IN YES

THE STOW POSITION, DO A CHECK 42 DO A CHECK FOR GROUND AT
FOR 28V DC ON THE L (R) SLEEVE
SYNC LOCK, CONNECTOR D1008
OR D1016, PIN 1 (PIN 2,
GROUND)(WDM 78-32-51,-61).

IS THERE 28V DC?

NO
SEE SHEET 3 (BLOCK 21A)
THE L (R) SLEEVE SYNC LOCK, CONNECTOR D1008 OR D1016, PIN 2.
 IF THERE IS GROUND, REPLACE THE L (R) SLEEVE SYNCLOCK (AMM 78-34-10/401).

IF THERE IS NOT GROUND, EXAMINE THE CIRCUIT FROM THE L (R) SLEEVE SYNC LOCK, CONNECTOR D1008 OR D1016,PIN 2, TO GROUND.
REPAIR THE PROBLEMS THAT YOU FIND.

Reverser Does Not Retract. REVERSER UNLOCKED Light Stays On When Reverse Thrust Cancelled. Figure 108 (Sheet 2)
C97129
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIX LIGHT EAU ú

 71-00-50
 WITH SYNC LOCKS  ú  CONFIG  7
 ú  C01  Page 134
 ú  Jul 15/94 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 21)

NO
YES
21A OPEN THE CIRCUIT BREAKER
"ENG 1 SYNC LOCK" ("ENG 2 SYNC
LOCK" AND "ENG 2 SYNC LOCK-

ALTN").
REMOVE THE SYNC LOCK LATCH RELAY, R477 (R479).
 CLOSE THE CIRCUIT BREAKER "ENG 1 SYNC LOCK" ("ENG 2 SYNC LOCK" AND "ENG 2 SYNC LOCK-ALTN").
MOVE THE REVERSE THRUST LEVER FROM THE STOW POSITION,THEN PUT IT BACK IN THE STOW POSITION.
IN LESS THAN 120 SECONDS FROM THE TIME YOU PUT THEREVERSE THRUST LEVER BACK IN THE STOW POSITION, DO A CHECK FOR GROUND AT THE SYNC LOCK LATCH RELAY, R477 (R479), CONNECTOR D10634 (D10638), PIN Y2.
DID YOU GET A GROUND?

NO
NO
21B DO A CHECK FOR 28V DC AT THE SYNC LOCK LATCH RELAY,

R477 (R479), CONNECTOR D10634
(D10638), PINS A1 AND B1.
IS THERE 28V DC AT EACH PIN?
YES
42B EXAMINE THE CIRCUIT FROM

THE SYNC LOCK LATCH RELAY,
R477 (R479), CONNECTOR D10634
(D10638), PIN A1 OR B1, TO THE
CIRCUIT BREAKER "ENG 1 SYNC
LOCK" ("ENG 2 SYNC LOCK" AND
"ENG 2 SYNC LOCK-ALTN"). REPAIR THE PROBLEMS THAT YOU FIND.
1

43 REPLACE THE SYNC LOCK LATCH RELAY, R477 (R479).
IF THE PROBLEM CONTINUES, EXAMINE THE CIRCUIT FROM THESYNC LOCK LATCH RELAY, R477 (R479), TO THE SYNC LOCK, V148 OR V150 (WDM 78-32-51, -61).
REPAIR THE PROBLEMS THAT YOU FIND.

Reverser Does Not Retract. REVERSER UNLOCKED Light Stays On When Reverse Thrust Cancelled. Figure 108 (Sheet 3)
C97130
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIX LIGHT EAU ú
　
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