71-00-42
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A10953
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES NONE
NOTE:  IT IS POSSIBLE FOR TAKEOFFS WITH PMC OFF CONDITIONS TO BE RELATED WITH HIGH EGT AND N1 BLOOM PAST TAKEOFF TARGET. IF TAKEOFF WAS WITH PMC OFF, MAKE SURE THE CORRECT COCKPIT PROCEDURES WERE FOLLOWED.
ENGINE WATER WASH IS AN EFFECTIVE MEANS TO RESTORE ENGINE PERFORMANCE AND MAY HELP TO REDUCE EGT ON TAKEOFF. THIS PERFORMANCE IMPROVEMENT IS EFFECTIVE BUT TEMPORARY. THIS MAINTENANCE ACTION IS NOT EXPECTED TO BE A LONG TERM FIX FOR HIGH EGT OR ENGINE DETERIORATION.
HIGH EGT ON
IF COMPLETE TROUBLESHOOTING HAS BEEN DONE, AND TAKEOFF - NACELLE
ENGINE DETERIORATION IS SHOWN BY CRUISE TREND,
TEMPERATURE USUAL  POWER ASSURANCE, IT IS NOT NECESSARY TO DO THIS PROCEDURE AGAIN (AMM 72-00-00/601).
YES REPAIR/REPLACE THE ENGINE
(AMM 71-00-02/401). IF FOD
FOUND, REFER TO BIRDSTRIKE/
FAILURE.  FOD TROUBLESHOOTING (AMM 71-00-47).

SERVICEABLE?
STATIC RIG CHECK (AMM 75-31-02/501). IS THE RIG CHECK CORRECT?

YES
SEE SHEET 2(BLOCK 11)
High EGT On Takeoff - Nacelle Temperature Usual
Figure 104 (Sheet 1)

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1(BLOCK 9)

YES
NO

11 DO THE VSV FEEDBACK CABLE
TRAVEL AND PULL (RESISTANCE)
CHECKS (AMM 75-31-02/501).

ARE THE CHECKS CORRECT?

CHECK CORRECT?

YES NO
17 DO THE VBV FEEDBACK CABLE
PULL (RESISTANCE) CHECK
(AMM 75-32-05/501).
IS CABLE OPERATION WITHIN THE CHECK CORRECT LIMITS?

YESNO

19 DO THE CIT AND T2 SENSOR
49 REPLACE THE T2 OPERATIONAL TEST (AMM 73-21-09/401) OR CIT
(AMM 71-00-00/501, TEST SENSOR (AMM 73-21-02), AS
NO. 11).APPLICABLE.
ARE THE SENSORS SERVICE-ABLE?

YES NO
21 DO THE HPTCC VALVE CHECK
(AMM 75-24-00/501).
IS THE HPTCC CHECK COR-RECT?

YES NO

23 DO THE PART POWER TRIM
53 ADJUST THE MEC POWER TRIM RUN (AMM 71-00-00/501, TEST (AMM 71-00-00/501, TEST
NO. 6).NO. 6).
IS (PMC OFF) N2 CORRECT?

YES SEE SHEET 3
(BLOCK 25)

High EGT On Takeoff - Nacelle Temperature Usual
Figure 104 (Sheet 2)

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 23)

CAL CHECK (AMM 77-21-00/501).
IS THE EGT INDICATING SYSTEM OPERATION CORRECT?

YES
YES
27 DO THE PNEUMATIC SYSTEM LEAKAGE TEST (AMM 71-00-00/

501, TEST NO. 1).
ARE LEAKS FOUND?

NO
YES
29 USE A BORESCOPE AND EXAMINE THE BOOSTER, HPC

3RD-, 5TH-, AND 9TH-STAGE
BLADES, COMBUSTION CHAMBER
AND HPT BLADES (AMM 72-00-00/
601).
IS DAMAGE MORE THAN THE LIMITS FOUND?

MOTOR (AMM 75-32-01/401).
IF THE PROBLEM CONTINUES, REPLACE THE MEC (AMM 73-21-01/ 401).
High EGT On Takeoff - Nacelle Temperature Usual
Figure 104 (Sheet 3)

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A11007
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
　
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