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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
ENGINE IN HIGH IDLE
28V DC ELECTRICAL POWER
ON GROUND WHEN SET
AIRPLANE IN CONFIGURATION FOR USUAL START
FOR LOW IDLE
NO
1
OPEN IDLE CONT CIRCUIT 2 REPAIR/REPLACE ELECTRICAL BREAKER ON PANEL P6. DISCON-WIRING BETWEEN CIRCUIT BREAKER NECT ELECTRICAL CONNECTOR PANEL P6 AND IDLE RESET D3016 FROM IDLE RESET SOLE-SOLENOID (WDM 73-23-11). NOID. IF THE PROBLEM CONTINUES,
CLOSE IDLE CONT CIRCUIT REPLACE THE MEC (73-21-01). BREAKER. MEASURE THE VOLTAGE BETWEEN PINS 2 AND 4.
IS THE VOLTAGE í21.5V?
YES
3 REPLACE IDLE RESET SOLENOID (73-21-03).
IF THE PROBLEM CONTINUES, REPLACE THE MEC (73-21-01).
Engine in High Idle on Ground when Set for Low Idle
Figure 118
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ENGINE IN LOW IDLE PREREQUISITES
ON GROUND WHEN SET 28V DC ELECTRICAL POWER
FOR HIGH IDLE AIRPLANE IN CONFIGURATION FOR USUAL START
BREAKER ON PANEL P6. DISCON-WIRING BETWEEN CIRCUIT BREAKER
NECT ELECTRICAL CONNECTOR PANEL P6 AND IDLE RESET
D3016 FROM IDLE RESET SOLE-SOLENOID (WDM 73-23-11).
NOID. IF THE PROBLEM CONTINUES,
MEASURE THE VOLTAGE REPLACE THE MEC (73-21-01).BETWEEN PINS 2 AND 4. IS THE VOLTAGE .21.4V?
SOLENOID (73-21-03).
IF THE PROBLEM CONTINUES, REPLACE THE MEC (73-21-01).
Engine in Low Idle on Ground when Set for High Idle
Figure 119
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ú C02 Page 136
ú Jul 15/98
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES NONE
NO N2 INDICATION OR IRREGULAR N2 INDICATION AT OR ABOVE IDLE
No N2 Indication or Irregular Indication at or Above Idle
Figure 120
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A10006
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
POWER PLANT - TROUBLE SHOOTING (POWER AND ENGINE RESPONSE)
__________________________________________________________
1. General
_______
A. This section provides trouble shooting charts for engine operation faults occurring at above idle power levels. Above idle faults not covered in this section include Surge (71-00-43), Bird Strike/FOD (71-00-47), and High Vibration Indication (71-00-47).
B. If the fault is not found when you use this trouble-shooting procedure, it is recommended you do Test No. 12, Engine Run Diagnostic Test (AMM 71-00-00/501), to find additional data to help you correct the problem.
2. Trouble Symptom Listing
_______________________
Trouble Symptom_______________ Begin Trouble Shooting
Slow/Hung Acceleration Fig. 101 Block 1
No Response To Thrust
Lever Movement Fig. 102 Block 1
Cannot Get Takeoff Power
With PMC Off; PMC On OK or
Cannot Get Takeoff Power
With PMC On and PMC Off Fig. 103 Block 1
Cannot Get Takeoff Power
With PMC On; PMC Off OK Fig. 103A Block 1
High EGT On Takeoff - Nacelle
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