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G17596
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
POWER PLANT - TROUBLE SHOOTING (SURGE)
______________________________________
1. General
_______
A. This section provides trouble shooting charts for incidences of a surge (or stall) to determine cause of surge. References are made to 72-00-00 I/C inspection procedure to determine if surge caused damage to engine.
2. Trouble Symptom Listing
_______________________
Trouble Symptom_______________ Begin Trouble Shooting
Surge (Stall) During Fig. 101 Block 1 Steady-State or Transient Operation at or above idle
3. Trouble Shooting Tips
_____________________
A. Engine surges (stalls) are caused by an aerodynamic disruption of the normally smooth airflow through the compressor stages due to foreign object ingestion or damage (FOD), distorted airfoils, variable stator vanes (VSV) off schedule, etc.
B. A surge may be indicated by varying degrees of abnormal engine noises, accompanied by flame from the engine exhaust and possibly from engine inlet in severe cases, fluctuating performance parameters, sluggish or no throttle response, high EGT, and/or a rapid EGT rise when throttle is advanced.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES NONESURGE (STALL) DURING STEADY-STATE
____IF CAUSE OF SURGE (STALL) IS KNOWN (TAILWIND,NOTE:
OR TRANSIENT OPERA-
CROSSWIND, OR LOW AIRPLANE SPEED DURING TION AT OR ABOVE REVERSE THRUST), DO BLOCKS 1,2 AND 3 ONLY. IT IDLE IS NOT NECESSARY TO DO TROUBLESHOOTING FOR
IS THE SPECIFIC GRAVITY CORRECT?
Surge (Stall) During Steady-State or Transient Operation
at or above Idle
Figure 101 (Sheet 1)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1
(BLOCK 4)
NO
5
VISUALLY EXAMINE THE VSV YES
ACTUATION SYSTEM (AMM 72-35-00/
601). IS THE DAMAGE MORE THAN THE LIMITS FOUND?
NO NO
44 ADJUST THE VSV ACTUATOR (AMM 75-31-00/501), THEN ADJUST THE VSV FEEDBACK CABLE (AMM 75-31-02/501).
YES NO
6 DO THE VSV FEEDBACK CABLE 45 ADJUST THE VSV FEEDBACK
STATIC RIG CHECK (AMM 75-31-02/ CABLE (AMM 75-31-02/501).
501).
IS THE RIG CHECK CORRECT?
YES NO 47 ADJUST THE VSV ACTUATORS OR THE VSV STAGES (AMM 75-31-00/501).
YES NO
8 DO THE VBV FEEDBACK CABLE
STATIC RIG CHECK (AMM 75-32-05/
501).
IS THE RIG CHECK CORRECT?
YES SEE SHEET 3
(BLOCK 10)
Surge (Stall) During Steady-State or Transient Operation
at or above Idle
Figure 101 (Sheet 2)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2
(BLOCK 8)
YES
NO
10 DO THE VBV FEEDBACK CABLE
51 REPAIR/REPLACE THE VBV RESISTANCE CHECK (AMM 75-32-05/ FEEDBACK CABLE (AMM 75-32-05/ 501). 501).
IS THE RESISTANCE CHECK CORRECT?
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