71-00-42
 ALL  ú
 ú  C02  Page 120
 ú  Jul 12/01 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1(BLOCK 13)

NO
NO

14 DO THIS PROCEDURE: "MEC" FUEL SHUTOFF LEVER POSITION

CHECK (AMM 71-00-59/101,
FIG. 114).
IS THE FUEL SHUTOFF LEVER POSITION WITHIN LIMITS?
YES

Flameout with Normal Operation After Restart
Figure 109 (Sheet 2)

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 71-00-42
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 ú  C02  Page 121
 ú  Nov 15/97 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FLAMEOUT WITH PREREQUISITES UNSUCCESSFUL RESTART 28V DC ELECTRICAL POWER DUE TO LOW/NO FUEL FLOW

YES
1
EXAMINE THE MAGNETIC CHIP
DETECTORS (AMM 79-00-00/601).

ARE INDICATIONS OF INTER-NAL ENGINE/GEARBOX FAILURE FOUND?

REPLACE THE BYPASS VALVE (AMM 28-22-61/401).

CLEAN/REPAIR/REPLACE THE CDP TUBE AS NECESSARY.

DO THE CORRECTIVE ACTION (AMM 71-00-59/101, FIG. 103). 101, FIG. 103). IS CONTAMINATION OR BLOCKAGE FOUND?

NO SEE SHEET 2
(BLOCK 6)

Flameout with Unsuccessful Restart due to Low/No Fuel Flow
Figure 110 (Sheet 1)

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 71-00-42
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 ú  C02  Page 122
 ú  Nov 15/97 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1
(BLOCK 5)

NO NO
6
LOOK TO SEE IF THE FUEL
53 REPLACE THE FUEL PUMP PUMP IMPELLER TURNS (AMM 73-11-01/401). (AMM 71-00-59/101, FIG. 102).
DOES THE IMPELLER TURN?

YESNO7
MANUALLY TURN THE N2 ROTOR
55 REPLACE THE ENGINE
(AMM 72-00-00/201).(AMM 71-00-02/401).

REMOVE A BORESCOPE PLUG (S6 THRU S8) AND OBSERVE IF THE N2 ROTOR BLADES TURN (AMM 72-00-00/601).
 DOES THE N2 ROTOR TURN NORMALLY?

ARE LEAKS FOUND? NO

SEE SHEET 3 (BLOCK 15)
Flameout with Unsuccessful Restart due to Low/No Fuel Flow
Figure 110 (Sheet 2)

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 71-00-42
 ALL  ú
 ú  C02  Page 123
 ú  Mar 15/98 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 13)

NO
NO

15 DO THIS PROCEDURE: "MEC"FUEL SHUTOFF LEVER POSITION

CHECK (AMM 71-00-59/101,
FIG. 114).
IS THE FUEL SHUTOFF LEVER POSITION WITHIN LIMITS?

YES

NO

17 REMOVE THE MEC

65 REPLACE THE FUEL PUMP
(AMM 73-21-01/401).
WITH THE MEC REMOVED, TURN THE N2 ROTOR(AMM 72-00-00/201) AND MAKE SURE THE FUEL PUMP OUTPUT SHAFT (MEC DRIVE SHAFT) TURNS NORMALLY IN BOTH DIRECTIONS.
DOES THE SHAFT TURN NORMALLY?

YES
(AMM 73-11-01/401).
NO

19 REMOVE THE FUEL PUMP
(AMM 73-11-01/401) AND
MANUALLY TURN N2 ROTOR

(AMM 72-00-00/201).
 DOES GEARBOX DRIVE SHAFT TO FUEL PUMP TURN NORMALLY IN THE TWO DIRECTIONS?

(AMM 73-11-01/401).
LOOK TO SEE IF THE MEC INPUT SHAFT CAN BE TURNED BYHAND WITHOUT BINDING OR UNUSUAL NOISES. IF NOT, REPLACE THE MEC (AMM 73-21-01/ 401).
Flameout with Unsuccessful Restart due to Low/No Fuel Flow
Figure 110 (Sheet 3)

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