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 THE SYNC 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 OnWhen Reverse Thrust Cancelled. Figure 110 (Sheet 3)
C97138
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIXTEEN LIGHT EAU ú

 71-00-50
 WITH AND WITHOUT SYNC LOCKS  ú CONFIG 7 ú C01 Page 143 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 2)

YES YES YES

3 DISCONNECT PLUG D3052

44 REPLACE THE CONTROL VALVE
(D3056), FROM THE REVERSER

MODULE FOR THE THRUST
CONTROL VALVE MODULE, M1173

REVERSER, M1173 (M1174)
(M1174)(WDM 78-32-11,-21).
(AMM 78-34-01/401).
NO IS THERE CONTINUITY

IF THE PROBLEM CONTINUES,
BETWEEN THE PLUG, PIN 7, AND

REPLACE THE HYDRAULIC FUSES
GROUND?
TO THE THRUST REVERSER (AMM 78-34-07/401).

NO
45 REPAIR THE OPEN CIRCUIT FROM THE REVERSER CONTROL VALVE MODULE, M1173 (M1174), PLUG D3052 (D3056), PIN 2, TO SPLICE SM100 (SM99)

NO YES

4 DISCONNECT THE PLUG FROM
23 EXAMINE THE ADJUSTMENT OF
THE CONTROL STAND, CONNECTORTHE REVERSER ARM SWITCH, S824
D5148 (WDM 78-32-11,-21). (S826)(AMM 78-34-05/201).

IS THERE CONTINUITY IS THE ADJUSTMENT OK? BETWEEN THE RECEPTACLE, PINS 4
NOAND 5 (1 AND 2)?
YES YES
24 DO A CONTINUITY TEST FROM THE REVERSER CONTROL VALVE MODULE, M1173 (M1174), PLUG D3052 (D3056), PIN 7, TO THE ENGINE ACCESSORY UNIT, M528, PLUG D1458A (D1458B),PIN 24 (WDM 78-32-11,-21).

IS THERE CONTINUITY?
NO
48 REPLACE THE ENGINE ACCES-SORY UNIT, M528 (AMM 78-34-06/ 401).

Reverser Does Not Retract. REVERSER UNLOCKED Light Stays On When Reverse Thrust Cancelled. Figure 110 (Sheet 4)
C97139
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIXTEEN LIGHT EAU ú

 71-00-50
 WITH AND WITHOUT SYNC LOCKS  ú CONFIG 7 ú C01 Page 144 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 4 (BLOCK 3)
YES
YES

5 DISCONNECT PLUG D3052

25 IS THERE CONTINUITY
BETWEEN PLUG D3052 (D3056),
PIN 6, AND GROUND
(WDM 78-32-11,-21)?

NO
50 REPAIR THE OPEN CIRCUIT BETWEEN THE PLUG, PIN 6, AND GROUND GD3044-DC (GD3042-DC) (WDM 78-32-11,-21).

(D3056), FROM THE REVERSER CONTROL VALVE MODULE, M1173(M1174)(WDM 78-32-11,-21).

SWITCH, S825 (S827) (AMM 78-34-05/201).

Reverser Does Not Retract. REVERSER UNLOCKED Light Stays On When Reverse Thrust Cancelled. Figure 110 (Sheet 5)
C97140
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIXTEEN LIGHT EAU ú

 71-00-50
 WITH AND WITHOUT SYNC LOCKS  ú CONFIG 7 ú C01 Page 145 ú Jul 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
MAKE SURE THESE CIRCUIT BREAKERS ARE CLOSED:
ENG 1 THR REV CONT SYS
　
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