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 (at less than 46% N2 RPM)  Fig. 111 Block 1
 ENGINE START switch remains in GRD position above
 cutout speed (47% N2 RPM)  Fig. 112 Block 1
 START VALVE OPEN light did not extinguish  Fig. 113 Block 1
 ALLOW ENGINE TO STABILIZE AT IDLE
 N2 idle rpm low  Fig. 114 Block 1
 N2 idle rpm high  Fig. 115 Block 1
 FF and EGT high  Fig. 116 Block 1
 Low N1 Idle Light Illuminated  Fig. 117 Block 1
 Engine Accelerated To High Idle  Fig. 118 Block 1
 No N2 indication or irregular N2 indication  AMM 71-00-54/101

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ú  Jul 12/01 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
NO N2 ROTOR ROTATION WHEN START INITIATED PREREQUISITES
MAKE SURE THESE CIRCUIT BREAKERS ARE OPEN AND ATTACH A DO-NOT-CLOSE TAG: ENGINE NO. 2 RIGHT IGNITION ENGINE NO. 2 LEFT IGNITION ENGINE NO. 1 RIGHT IGNITION ENGINE NO. 1 LEFT IGNITION
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201) PNEUMATIC POWER IS ON (AMM 36-00-00/201) PUT THE START LEVERS IN THE CUTOFF POSITION AIRPLANE ON AN OPEN AIR RAMP FOR AN APU START

NO
YES
DO THE PROCEDURE TO DRY
11 DISCONNECT ELECTRICAL CON-MOTOR THE ENGINE (AMM 71-00-00/ NECTOR D424 FROM THE V6 START 201). MOVE THE START SWITCH VALVE (WDM 80-11-11).TO THE GROUND POSITION. MEASURE FOR 28V DC AT CON-

 DOES THE START VALVE OPEN NECTOR, PIN 2 (PIN 1, GROUND). LIGHT COME ON? IS 28V DC PRESENT?

YES
NO 22 REPLACE THE APPROPRIATE SEE SHEET 2 ENGINE START SWITCH, S266 OR (BLOCK 2) S267 (WDM 80-11-02). IF THE PROBLEM CONTINUES, EXAMINE THE CIRCUIT FROM CON-NECTOR, ENG 1 (2) START VALVE, V6, PIN 2 (PIN 1, GROUND), THROUGH THE S2 ENG 1 (2), S266 (S267) START/IGNITION SWITCH, TO THE CB ENG 1 (2) START VALVE, FOR AN OPEN CIRCUIT (WDM 80-11-02). REPAIR THE PROBLEMS THAT YOU FIND.
1
No N2 Rotor Rotation When Start Initiated
Figure 101 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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)

YES
NO
YES

YES NO 24 REPLACE THE ENGINE STARTER (AMM 80-11-01/401). GO TO BLOCK 4.
NO ____DO NOT DO AN ENGINE
NOTE: START BEFORE BLOCK 4. YES
NO
4 DO THE APU OPERATION TEST 25 DO THE TROUBLESHOOTING OF
(AMM 49-11-00/501). THE APU FOR INDICATION
DID THE APU OPERATE PROBLEMS (AMM 49-00-00/101).
CORRECTLY?

YES
NO

5 MONITOR THE PNEUMATIC DUCT
26 DO THE TROUBLESHOOTING OF
PRESSURE INDICATOR ON THE THE APU FOR DUCT PRESSURE
OVERHEAD PANEL, P5. FLUCTUATIONS (AMM 49-00-00/
IS THE DUCT PRESSURE 101). STABLE?

YES SEE SHEET 3
(BLOCK 6)

No N2 Rotor Rotation When Start Initiated
Figure 101 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B06919
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 5)

YES

YES
6
SHUT DOWN THE APU
(AMM 49-11-00/501).

DO A CHECK OF THE MAGNETIC CHIP DETECTORS (AMM 79-00-00/ 601).
 ARE INDICATIONS OF AN ENGINE AND/OR GEARBOX FAILURE FOUND?

NO
NO
NO

7 MANUALLY TURN THE N2 ROTOR17 A NEW ENGINE (PRODUCTION
　
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