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71-00-41
ALL ú
ú C02 Page 109
ú Jul 15/94
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES ENGINE START MAY BE REQUIRED
NO N1 ROTOR ROTATION VISUALLY OBSERVED DURING START ATTEMPT
YES
1
VISUALLY CHECK ENGINE
INLET AND EXHAUST AREAS FOR
OBVIOUS SIGNS OF DAMAGE.
IS DAMAGE FOUND INDICATIVE OF ENGINE FAILURE?
NO
YES
2 VISUALLY CHECK FAN BLADES FOR EVIDENCE OF INTERFERENCE/
BINDING WITH FAN CASE ABRAD-
ABLE SHROUD.
IS INTERFERENCE FOUND?
NO
SEE SHEET 2 (BLOCK 3)
17 REPLACE ENGINE (71-00-02).
No N1 Rotor Rotation Visually Observed During Start Attempt
Figure 102 (Sheet 1)
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71-00-41
ALL ú ú C02 Page 110 ú Nov 15/92
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1
(BLOCK 2)
NO
NO YES
3
WARNING
11 EXAMINE THE FWD AND AFT
SUMP MAGNETIC CHIP DETECTORS
HEAVY GLOVES SHOULD BE WORN TO (AMM 79-00-00/601).
PREVENT PERSONAL INJURY WHEN ARE INDICATIONS OF ENGINE
YOU TURN N1 ROTOR.
FAILURE FOUND?
TRY TO MANUALLY TURN N1
NO
ROTOR.
DOES N1 ROTOR TURN FREELY
YES
WITHOUT UNUSUAL NOISES?13 WAIT AT LEAST 30 MINUTES
AND TRY TO MANUALLY TURN N1
NOTE:LIGHT RUBBING OF SEALS
ROTOR.
AND SHROUDS IS USUAL.
DOES N1 ROTOR TURN FREELY YES WITHOUT UNUSUAL NOISES?
NO NO
15 DO AN ENGINE DRY MOTOR FOR ONE MINUTE (AMM 71-00-00/201). DOES N1 ROTOR TURN FREELY YESWITHOUT UNUSUAL NOISES?
YES
5 EXAMINE THE FWD AND AFT
SUMP MAGNETIC CHIP DETECTORS
(AMM 79-00-00/601).
ARE INDICATIONS OF ENGINE
FAILURE FOUND?
NONO
YES
No N1 Rotor Rotation Visually Observed During Start Attempt
Figure 102 (Sheet 2)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
NO STARTING FUEL 28V DC ELECTRICAL POWER
FLOW; N2 ROTATES
NO
1
WITH THE ENGINE STOPPED,
PUT THE APPLICABLE START
LEVER TO THE IDLE POSITION.
DOES THE FUEL VALVE CLOSED LIGHT ON THE PILOTS' OVERHEADPANEL P5 COME ON FROM DIM TO BRIGHT THEN GO OFF?
YES
NO
3 DO THE MEC FUEL SHUTOFF LEVER POSITION CHECK (IDLE
POSITION CHECK)(AMM 71-00-59/
101, FIG. 114).
IS THE IDLE POSITION CHECK CORRECT?
(AMM 73-21-01/401).
No Starting Fuel Flow; N2 Rotates
Figure 103
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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
HIGH STARTING FUEL FLOW ENGINE OPERATION CAN BE NECESSARY
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