No N2 Rotor Rotation When Start Initiated
Figure 101 (Sheet 3)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
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 PUT THE AIRPLANE ON A OPEN AIR RAMP FOR AN APU
START
OPEN THE FAN COWL PANELS (AMM 71-11-02/201)
1
Slow N2 Rotor Rotation When Start Initiated
Figure 101A (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B06579
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1
(BLOCK 1)
NO
NOYES
2
MONITOR THE PNEUMATIC
DUCT PRESSURE INDICATOR.
DOES THE DUCT PRESSURE
YES
CHANGE FREQUENTLY?
NONO
15 SHUTDOWN THE APU 26 REPLACE THE MISC SWITCHING (AMM 49-11-00/501). MODULE, M278, FOUND IN THE SEE SHEET 3
DO THE CHECK OF THE MISC E3-2 ELECTRICAL EQUIPMENT (BLOCK 3)
SWITCHING MODULE, M278 (ENGINE SHELF (AMM 52-71-31/401).
STARTER PROTECTION CIRCUIT)
THAT FOLLOWS:
1.
OPEN THE CIRCUIT BREAKERS
THAT FOLLOW: APU GENERATOR CONTROL (C6) ON THE P6-4 PANEL APU CONTROL (C33) ON THE P6-5 PANEL.
2.
TURN THE APU BLEED VALVE TO THE ON POSITION
3.
TURN THE APU MASTER SWITCH, S248, TO THE ON POSITION
4.
MOVE THE ENGINE NO. 1 START SWITCH, S266, TO THE GROUND POSITION
5.
WHEN YOU MOVE THE ENGINE NO. 1 START SWITCH TO THE GROUND POSITION, DO YOU HEAR A "CLICK" AT THE LOAD CONTROL VALVE IN THE APU COMPARTMENT?
YES
NO
16
27 REPLACE THE MISC SWITCHING
1.
MOVE THE ENGINE NO. 1 START MODULE, M278, FOUND IN THE SWITCH, S266, TO THE OFF E3-2 ELECTRICAL EQUIPMENT POSITION SHELF (AMM 52-71-31/401).
2.
MOVE THE ENGINE NO. 2 START SWITCH, S267, TO THE GROUND POSITION
3.
WHEN YOU MOVE THE ENGINE NO. 2 START SWITCH TO THE GROUND POSITION, DO YOU HEAR A "CLICK" AT THE LOAD CONTROL VALVE IN THE APU COMPARTMENT?
YES
Slow N2 Rotor Rotation When Start Initiated
Figure 101A (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 2)
NO
NO
3
DO THE APU OPERATION TEST
(AMM 49-11-00/501).
DID THE APU OPERATE CORRECTLY?
YES NO4
DO THE PNEUMATIC LEAK TEST (AMM 71-00-00/501, TEST NO. 1) AND LOOK FOR LARGE LEAKAGE SOURCES IN THE STARTER DUCT.
ARE LEAKAGE SOURCES FOUND?
YES
29 DO THE TROUBLESHOOTING OF THE APU INDICATION PROBLEMS DURING APU OPERATION AND APU BLEED AIR PROBLEMS (AMM 48-00-00/101).
30 DO THE LOW PNEUMATIC DUCT PRESSURE CHECK.
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