71-00-50
 ALL  ú  CONFIG  7 
 ú  C01  Page 101 
 ú  Jul 15/94 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL //////////////////////// 
Trouble Symptom_______________ Begin Trouble Shooting REVERSER Fault Light Comes On In Flight. Fig. 111 Block 1
 REVERSER Fault Light Fig. 112 Block 1
 Stays On When Reverser Is Retracted.
 Reverser Operates Normally.
 REVERSER Fault Lights Fig. 113 Block 1
 (VALVE DISAGREE, RESTOW, AND SLEEVE DISAGREE)
 Stay On When Reverser Is Retracted.
 Reverser Operates Normally.
 REVERSER Fault Lights Fig. 114 Block 1
 (VALVE DISAGREE AND RESTOW)
 Stay On When Reverser Is Retracted.
 Reverser Operates Normally.
 REVERSER Fault Light Fig. 115 Block 1
 (VALVE DISAGREE)
 Stays On When Reverser Is Retracted.
 Reverser Operates Normally.
 REVERSER Fault Light Fig. 116 Block 1
 (SLEEVE DISAGREE)
 Stays On When Reverser Is Retracted.
 Reverser Operates Normally.
 REVERSER Fault Light Fig. 117 Block 1
 Stays On When Reverser Is Retracted.
 Reverser Operates Normally.
 REVERSER Fault Lights Fig. 118 Block 1
 (ISO VLV OPEN AND RESTOW)
 Stay On When Reverser Is Retracted.
 Reverser Operates Normally.
 REVERSER Fault Lights Fig. 119 Block 1
 (ISO VLV OPEN OR CONT VLV DEPLOY)
 Stay On When Reverser Is Retracted.
 Reverser Operates Normally.
 REVERSER Fault Light Fig. 120 Block 1
 (SLEEVE DISAGREE)
 Stays On When Reverser Is Retracted.
 Reverser Operates Normally.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 71-00-50
 ALL  ú CONFIG 7 ú C01 Page 102 ú Jul 15/94 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL //////////////////////// 
Trouble Symptom_______________  Begin Trouble Shooting______________________ 
 REVERSER Fault Light  Fig. 121 Block 1 
 Comes On When Reverser Is Extended. 
 Reverser Operates Normally. 
 REVERSER Fault Lights  Fig. 122 Block 1 
 (SLEEVE DISAGREE AND RESTOW) 
 Come On When Reverser Is Extended. 
 Reverser Operates Normally. 
 REVERSER Fault Lights  Fig. 123 Block 1 
 (VALVE DISAGREE AND RESTOW) 
 Come On When Reverser Is Extended. 
 Reverser Operates Normally. 
 REVERSER Fault Light  Fig. 124 Block 1 
 (RESTOW) 
 Comes On When Reverser Is Extended. 
 Reverser Operates Normally. 
 REVERSER Fault Lights  Fig. 125 Block 1 
 (SLEEVE DISAGREE AND RESTOW) 
 Come On When Reverser Is Extended. 
 Reverser Operates Normally. 
 REVERSER UNLOCKED Light ON or ON  Fig. 126 Block 1 
 Intermittently in Flight Or On The Ground. 
 REVERSER Light Did Not Come ON. 
 Reverser Does Not Extend Within 5 Seconds  Fig. 127 Block 1 
 Or Does Not Retract Within 8 Seconds 
 When Using the Standby Hydraulic System.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 71-00-50
 ALL  ú CONFIG 7 ú C01 Page 103 ú Jul 15/95 
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 SYNC LOCK  
ENG 1 THR REV CONT SYS  
ENG 1 THR REV IND SYS  
ENG 2 SYNC LOCK  
ENG 2 SYNC LOCK-ALTN  
ENG 2 THR REV CONT SYS  
ENG 2 THR REV CONT SYS-ALTN  
ENG 2 THR REV IND SYS  
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION:  
ELECTRICAL POWER IS ON (AMM 24-22-00/201)  
HYDRAULIC POWER IS ON (AMM 29-15-00/201)  
 
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