IS THE T2 SENSOR SERVICE-ABLE?

YES
NO

5 DO THE MEC POWER LEVER IDLE POSITION CHECK

(AMM 71-00-59/101, FIG. 107).
IS THE IDLE POWER POSITION CHECK CORRECT?

YES
YES
7 EXAMINE ALL CDP TUBE CON-NECTIONS FOR LEAKS, AND CDP

TUBE FOR BLOCKAGE OR DAMAGE
(AMM 71-00-59/101, FIG. 105).
ARE LEAKS/BLOCKAGE/DAMAGE FOUND?

NO
YES
9 EXAMINE THE PS12 TUBE/

MANIFOLD FOR LEAKS, BLOCKAGE,
AND DAMAGE (AMM 71-00-59/101,
FIG. 106).
 ARE LEAKS/BLOCKAGE/DAMAGE FOUND?
NO

Low N2 RPM at Low Idle
Figure 114

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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
ENGINE OPERATION

1

High N2 RPM at Low Idle
Figure 115

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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL FLOW AND EGT  PREREQUISITES 
HIGH AT USUAL IDLE  NONE 
N2 

YES1 LOOK FOR SUBSTANTIAL AIR
LEAKS IN 5TH- AND 9TH-STAGE
PNEUMATIC DUCTING, HPT CLEAR-

ANCE CONTROL TUBES, AND HPT-
LPT COOLING AIR TUBES
(AMM 71-00-58, FIG. 107).
ARE LEAKS FOUND

NO
YES
3 DO THE 5TH-STAGE BLEED
SYSTEM CHECK (AMM 75-34-00/
501).

IS THE BLEED VALVE SERV-ICEABLE?

NO
NO

5 DO THE VSV FEEDBACK CABLE
STATIC RIGGING CHECK
(AMM 75-31-02/501).

IS THE RIG CHECK CORRECT?

(AMM 71-00-00/501, TEST 11). (AMM 73-21-02/401). IS THE CIT SENSOR SERVICE-ABLE?

YES YES

11 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?

NO SEE SHEET 2
(BLOCK 13)

Fuel Flow and EGT High at Usual Idle N2
Figure 116 (Sheet 1)

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 (BLOCK 11)

DOES THE PROBLEM CONTINUE?

(AMM 75-31-00/501). DOES THE PROBLEM CONTINUE?
YES

Fuel Flow and EGT High at Usual Idle N2
Figure 116 (Sheet 2)

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A10013
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
LOW N1 IDLE LIGHT ILLUMINATED
PREREQUISITES NONE

Low N1 Idle Light Illuminated
Figure 117

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