737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 (BLOCK 5)

YES

NO
7
DO THE MEC FUEL SHUTOFF
LEVER POSITION CHECK (CUTOFF
POSITION CHECK)(AMM 71-00-59/
101, FIG. 114).

IS THE CUTOFF POSITION CHECK CORRECT?

YES
YES

NO
27 DO A DRY MOTOR (AMM 71-00-00/201) FOR 90 SEC-ONDS. START THE ENGINE AGAIN.

NO
DOES THE PROBLEM CONTINUE?
YES
YES

11 DO THE FUEL NOZZLE LEAK

CHECK (AMM 71-00-59/101,
FIG. 115).
 IS DAMAGE/LEAKING NOZZLE
FOUND?

NO
YES

13 EXAMINE THE MAGNETIC CHIP

DETECTORS (AMM 79-00-00/601).
ARE SIGNS OF ENGINE OR
GEARBOX FAILURE FOUND?
NO
YES

15 EXAMINE THE FUEL FILTER(AMM 73-11-02/601) FOR

METALLIC MATERIAL.
IS UNUSUAL AMOUNT OF METALLIC MATERIAL FOUND?
NO

Instantaneous Lightup (Torching) with Start Lever Movement/Internal
Engine Fire After Shutdown
Figure 107 (Sheet 2)

A09643
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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SLOW START/HUNG START BEFORE STARTER CUTOUT; EGT USUAL
YES
NO
NO

YES
YES
3 DO THE PNEUMATIC LEAK TEST
(AMM 71-00-00/501, TEST 1) AND
EXAMINE START DUCT FOR TOO
MUCH LEAKAGE.
IS LEAKAGE FOUND?
NO
YES
NO

NO

5 DO THE MEC SPECIFIC GRAVITY SETTING CHECK
(AMM 71-00-58/101, FIG. 103).
IS THE SETTING WITHIN THE PERMITTED RANGE FOR THE FUEL?

YES
SEE SHEET 2 (BLOCK 6)

PREREQUISITES
ENGINE OPERATION

NO

21 ON CIRCUIT BREAKER PANEL

P6, OPEN APPLICABLE ENG LEFT
AND RIGHT IGNITION, AND ENG
START VALVE CIRCUIT BREAKERS.
OPEN LEFT FAN COWL PANEL AND DISCONNECT CONNECTOR D424 FROM START VALVE. CLOSE START YESVALVE CIRCUIT BREAKER.
POSITION APPLICABLE ENGINE START SWITCH TO GRD POSITION.
DO A CHECK FOR 28V DC ATRELAY CONNECTOR SOCKET 2 (AIRPLANE GROUND).
IS THERE 28V DC?
NO

22 DO THE TROUBLESHOOTING OF THE APU FOR DUCT PRESSURE
FLUCTIONS (AMM 49-00-00/101)
IS DUCT PRESSURE NORMAL?
YES

42 REPLACE THE APPLICABLE
START/IGNITION SWITCH, S266 OR
S267 (WDM 80-11-11).
PUT THE AIRPLANE BACK TO THE USUAL CONDITION.

43 REPLACE THE APPLICABLE N2
TACHOMETER RELAY, R357 OR R358
(WDM 80-11-11).
 PUT THE AIRPLANE BACK TO THE USUAL CONDITION.
Slow Start/Hung Start Before Starter Cutout; EGT Usual
Figure 108 (Sheet 1)

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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 (BLOCK 5)
YES

YES
6
EXAMINE ALL CDP TUBE
CONNECTIONS FOR LEAKS, AND CDP
TUBING FOR BLOCKAGE OR DAMAGE
(AMM 71-00-59/101, FIG. 104).

ARE LEAKS/BLOCKAGE/DAMAGE FOUND?

AND 9TH-STAGE PNEUMATIC DUCTING/VALVES FOR SIGNS OF LEAKS (AMM 71-00-58/101, FIG. 107).
ARE LEAKS FOUND?
COMPONENTS.

DO THE VSV ACTUATOR RIG CHECK (AMM 75-31-00/501), THEN (AMM 75-32-00/501). ADJUST THE VSV FEEDBACK CABLE IS THE RIG CHECK CORRECT? (AMM 75-31-02/501).

YES
YES

11 EXAMINE THE MAGNETIC CHIP
51 REPLACE THE ENGINE
DETECTORS (AMM 79-00-00/601). (AMM 71-00-02/401).
ARE SIGNS OF ENGINE OR
GEARBOX FAILURE FOUND?

NO SEE SHEET 3
(BLOCK 12)

Slow Start/Hung Start Before Starter Cutout; EGT Usual
Figure 108 (Sheet 2)

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