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 ALL  ú ú C02 Page 101 ú Jul 12/99 
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL //////////////////////// 
Trouble Symptom_______________  Begin Trouble Shooting______________________ 
 Flameout With No Restart 
 Attempt for Non-Engine 
 Related Reasons  Fig. 112 Block 1 
 N1 and N2 RPM 
 Not Stable  Fig. 113 Block 1 
 Fig. 114 NOT USED 
 PMC INOP Light On  Fig. 115 Block 1 
 Throttle Stagger or N1 Is Not At Target 
 For Throttle Hold During Takeoff  Fig. 116 Block 1 
 Throttle Stagger or N1 Is Not At Target 
 in All Phases of Flight Not Known  Fig. 117A Block 1 
 Throttle Stagger or N1 Is Not At Target 
 at Climb or Cruise  Fig. 117B Block 1 
 Throttle Stagger or N1 Is Not At Target 
 in Approach  Fig. 117C Block 1 
 N1 RPM Out of Limits During MEC 
 Part Power Trim Test  Fig. 118 Block 1 
 Differential Engine Acceleration 
 From Low Idle  Fig. 119 Block 1 
 Slow/Hung Deceleration  Fig. 120 Block 1 
 Engine Speeds High During High 
 Altitude Descent  Fig. 121 Block 1 
 Reverse %N1 Lower Or Higher Than 
 Expected  Fig. 122 Block 1
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL //////////////////////// 
PREREQUISITES ENGINE OPERATION CAN BE NECESSARY 
SLOW/HUNG ACCELERATION
LIMITS FOUND?
NO NO
4 DO THE SPECIFIC GRAVITY 
SETTING CHECK (AMM 71-00-58/ 
101, FIG. 103). 
IS THE SETTING WITHIN THE PERMITTED RANGE OF THE FUEL?
YES YES 
5 DO A CHECK OF THE CDP TUBE 
INCLUDING TUBE DRAIN HOLES FOR 
LEAKS, DAMAGE, AND BLOCKAGE. 
CHECK INLET TO THE CDP/CBP 
SENSOR FOR BLOCKAGE 
(AMM 71-00-59, FIG. 104). 
ARE LEAKS, DAMAGE OR BLOCKAGE FOUND?
NOYES
6 VISUALLY EXAMINE THE VSV 
36 REPAIR/REPLACE THE VSV 
ACTUATOR SYSTEM (AMM 72-35-00/ ACTUATION SYSTEM COMPONENTS. 
601) FOR DAMAGE. 
IS DAMAGE MORE THAN THE LIMITS FOUND? 
NO 
YES 
NO SEE SHEET 2 
(BLOCK 8)
Slow/Hung Acceleration 
Figure 101 (Sheet 1)
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 ú  C01  Page 103 
 ú  Mar 15/99 
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL //////////////////////// 
FROM SHEET 1 
(BLOCK 7) 
NO 
YES
8 VISUALLY EXAMINE THE 5TH-
38 REPAIR/REPLACE THE
AND 9TH-STAGE PNEUMATIC COMPONENTS. 
DUCTING/VALVES FOR SIGNS OF 
LEAKS (AMM 71-00-58/101, 
FIG. 107). 
ARE LEAKS FOUND?
NO NO
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