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SYNC LOCK" ("ENG 2 SYNC LOCK" REMOVE THE SYNC LOCK LATCH AND "ENG 2 SYNC LOCK-ALTN") OR RELAY, R477 (R479). FROM PIN A1 OR B1, TO THE CIR-
CLOSE THE CIRCUIT BREAKER CUIT BREAKER "ENG 1 SYNC LOCK""ENG 1 SYNC LOCK" ("ENG 2 SYNC ("ENG 2 SYNC LOCK" AND "ENG 2 LOCK" AND "ENG 2 SYNC LOCK-SYNC LOCK-ALTN"). ALTN"). REPAIR THE PROBLEMS THAT
MOVE THE L (R) REVERSE YOU FIND. THRUST REVERSE LEVER TO THE REVERSE IDLE POSITION.
 DO A CHECK FOR 28V DC ATCONNECTOR D10634 (D10638),PIN A1 AND B1.
 IS THERE 28V DC AT EACH PIN?
YES
24B 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 Extend. REVERSER UNLOCKED Light Does Not Come On.
Reverse Interlock Does Not Release.
Figure 103 (Sheet 3)

C97098
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIX LIGHT EAU ú

 71-00-50
 WITH SYNC LOCKS  ú  CONFIG  7
 ú  C01  Page 114
 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 3)

NO NO NO

4 DEPRESSURIZE THE A (B)

12 DISCONNECT PLUG D3052 25 REPAIR THE OPEN CIRCUIT HYDRAULIC SYSTEM.(D3056) FROM THE REVERSER CON-FROM THE REVERSER CONTROL WAIT A MINIMUM OF TROL MODULE, M1173 (M1174) VALVE MODULE, M1173 (M1174), 30 SECONDS. (WDM 78-32-11,-21). PLUG D3052 (D3056), PIN 2, TO DOES THE "REVERSER" LIGHT IS THERE 28V DC BETWEEN SPLICE SM100 (SM99), IN THE GO OFF?PIN 2 AND GROUND?P6-2 CIRCUIT BREAKER PANEL (WDM 78-32-11,-21).
YES  YES YES

SEE SHEET 5  13 IS THERE CONTINUITY
26 REPLACE THE REVERSER CON-
(BLOCK 5)  BETWEEN PLUG D3052 (D3056), TROL VALVE MODULE, M1173 PIN 7, AND GROUND
(M1174)(AMM 78-34-01/401). (WDM 78-32-11,-21)?
NO
YES

14 DISCONNECT THE PLUG FROM 27 REPAIR THE OPEN CIRCUIT THE CONTROL STAND, CONNECTOR FROM THE REVERSER CONTROL D5148P (WDM 78-32-11,-21).VALVE MODULE, M1173 (M1174),
IS THERE CONTINUITY PLUG D3052 (D3056), PIN 7, TO
BETWEEN THE RECEPTACLE, PINS 4 THE REVERSER ARM SWITCH, S824
AND 6?  (S826), OR FROM THE ARM SWITCH
TO SPLICE SM101 (SM98).
NO
NO
15 EXAMINE THE ADJUSTMENT OF 28 ADJUST THE SWITCHTHE REVERSER ARM SWITCH, S824 (AMM 78-34-05/201). (S826)(AMM 78-34-05/201).
IS THE ADJUSTMENT OK?
YES
29 REPLACE THE SWITCH (AMM 78-34-05/201).
Reverser Does Not Extend. REVERSER UNLOCKED Light Does Not Come On.
Reverse Interlock Does Not Release.
Figure 103 (Sheet 4)

C97099
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SIX LIGHT EAU ú

 71-00-50
 WITH SYNC LOCKS  ú  CONFIG  7
 ú  C01  Page 115
 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 4)

YES NO YES

5 DISCONNECT PLUG D3052
16 DISCONNECT THE PLUG FROM 30 REPAIR THE OPEN CIRCUIT
(D3056) FROM THE REVERSER CON-THE CONTROL STAND, CONNECTOR FROM THE REVERSER CONTROL
TROL MODULE, M1173 (M1174) D8315 (D8313) VALVE MODULE, M1173 (M1174),
(WDM 78-32-11,-21). (WDM 78-32-11,-21). PLUG D3052 (D3056), PIN 4, TO

IS THERE 28V DC BETWEEN IS THERE CONTINUITY SPLICE SM100 (SM99), IN THE
PIN 4 AND GROUND? BETWEEN THE RECEPTACLE, PINS 4 P6-2 CIRCUIT BREAKER PANEL
AND 5 (22 AND 23)? (WDM 78-32-11,-21).

YES
NO

NO
17 EXAMINE THE ADJUSTMENT OF 31 ADJUST THE SWITCH THE REVERSER CONTROL SWITCH,(AMM 78-34-04/201). S828 (S829)(AMM 78-34-04/201).
IS THE ADJUSTMENT OK?
YES
32 REPLACE THE SWITCH (AMM 78-34-04/201).
NO

6 IS THERE CONTINUITY 33 REPAIR THE OPEN CIRCUIT
BETWEEN PLUG D3052 (D3056), FROM THE REVERSER CONTROL
PIN 5, AND GROUND VALVE MODULE, M1173 (M1174),
　
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