High Starting Fuel Flow
Figure 104
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
FUEL FLOW IS NOT
ENGINE OPERATION OR ENGINE MOTORING CAN BE NECESSARY
STABLE DURING START
YES
NO
7 DO THE CIT SENSOR TEST
(AMM 71-00-00/501, TEST 11).
IS THE CIT SENSOR SERVICE-ABLE?
YES
Fuel Flow is Not Stable During Start
Figure 105
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ENGINE WILL NOT PREREQUISITES
START ON ONE 115V AC ELECTRICAL POWER; ENGINE OPERATION MAY BE
IGNITION SYSTEM REQUIRED
1
PERFORM IGNITION SYSTEM AUDIBLE CHECK ON FAILED SYSTEM (71-00-59, FIG. 109).
IS SPARK HEARD?
NO
11 REPLACE IGNITER PLUG
(74-21-02). REPEAT AUDIBLE
CHECK.
IS SPARK HEARD?
YES
(73-11-04) OR REPLACE ENGINE (71-00-02) AS REQUIRED.
Engine will not Start on One Ignition System
Figure 106
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
INSTANTANEOUS PREREQUISITES
LIGHTUP (TORCHING) NONE
WITH START LEVER
MOVEMENT/INTERNAL
ENGINE FIRE AFTER
SHUTDOWN
YESYES
1
VISUALLY EXAMINE ENGINE
INLET AND EXHAUST AREAS FOR
OBVIOUS SIGNS OF DAMAGE.
NO
IS DAMAGE FOUND?
YESNO 23 DO THE INSPECTION FOR ENGINE FIRE, HIGH NACELLE TEM-PERATURE, OR USE OF FIRE EXTINGUISHING AGENTS(AMM 72-00-00/601).
IS DAMAGE MORE THAN THE LIMITS FOUND?
NO
25 REPAIR/REPLACE THE COMPO-NENTS AS NECESSARY. CONTINUE TO DO TROUBLESHOOTING AT BLOCK 5.
YES
3 DO THE INSPECTION FOR
ENGINE FIRE, HIGH NACELLE TEM-PERATURE, OR USE OF FIRE
EXTINGUISHING AGENTS
(AMM 72-00-00/601).
IS DAMAGE MORE THAN THE LIMITS FOUND?
SEE SHEET 2
(BLOCK 7)
Instantaneous Lightup (Torching) with Start Lever Movement/Internal
Engine Fire After Shutdown
Figure 107 (Sheet 1)
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CFM56 ENGINES
