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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 11)
EXAMINE THE BOOSTER, HPC 3RD-, (AMM 71-00-02/401).
5TH- AND 9TH-STAGE BLADES,
COMBUSTION CHAMBER AND HPT
BLADES (AMM 72-00-00/601).
IS DAMAGE MORE THAN THE LIMITS FOUND?
Slow Start/Hung Start Before Starter Cutout; EGT Usual
Figure 108 (Sheet 3)
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H55128
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SLOW START/HUNG PREREQUISITES
START AT OR AFTER ENGINE OPERATION CAN BE NECESSARY
STARTER CUTOUT; EGT
USUAL
GRAVITY SETTING CHECK GRAVITY (AMM 71-00-58/101, (AMM 71-00-58/101, FIG. 103). FIG. 103).
IS THE SETTING WITHIN THE PERMITTED RANGE FOR THE FUEL?
YES YES
2 EXAMINE ALL CDP TUBING
CONNECTIONS FOR LEAKS, AND CDP
TUBING FOR BLOCKAGE OR DAMAGE
(AMM 71-00-59/101, FIG. 104).
ARE LEAKS, BLOCKAGE OR
DAMAGE FOUND?
NO NO
3 DO THE VSV FEEDBACK CABLE 33 ADJUST THE VSV FEEDBACK
STATIC RIG CHECK CABLE (AMM 75-31-02/501).
(AMM 75-31-02/501).
IS THE RIG CHECK CORRECT?
YES
NO
34 REPLACE THE CIT SENSOR (AMM 73-21-02/401).
YES NO
5 CFM56-3-B1/B2 ENGINES;35 ADJUST THE VSV ACTUATORS
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
6 DO THE CHECK OF THE 5TH-
STAGE START BLEED SYSTEM
(AMM 75-34-00/501).
IS THE 5TH-STAGE START BLEED VALVE SERVICEABLE?
NO SEE SHEET 2
(BLOCK 7)
Slow Start/Hung Start at or After Starter Cutout; EGT Usual
Figure 108A (Sheet 1)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 (BLOCK 6)
PUMP (AMM 73-11-01/401).
Slow Start/Hung Start at or After Starter Cutout; EGT Usual
Figure 108A (Sheet 2)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES NONE
HOT/IMPENDING HOT START OR INDICATIONS OF SURGE (STALL) DURING START
YES
1 VISUALLY EXAMINE THE
ENGINE INLET AND EXHAUST AREAS
FOR OBVIOUS SIGNS OF DAMAGE.
IS DAMAGE FOUND?
NO YES
3 DO THE "HOT START OF AN ENGINE" PROCEDURE IN THE
"ENGINE OPERATIONS ABOVE
LIMITS AND HIGH ENGINE STRESS
INSPECTION" (AMM 72-00-00/
601).
IS DAMAGE MORE THAN THE
LIMITS FOUND?
NO
NO
5 DO THE MEC SPECIFIC GRAVITY SETTING CHECK
(AMM 71-00-58/101, FIG. 103).
IS THE SETTING CORRECT?
YES
YES
7 EXAMINE THE CBP TUBE AND
CONNECTIONS FOR LEAKS, DAMAGE,
OR BLOCKAGE (AMM 71-00-59/101,
FIG. 105).
ARE DAMAGE, BLOCKAGE OR
LEAKS FOUND?
NO
NO
YES
SEE SHEET 2 (BLOCK 9)
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