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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
POWER PLANT - TROUBLE SHOOTING (MISCELLANEOUS OBSERVED PROBLEMS)
________________________________________________________________
1. General
_______
A. This section provides trouble shooting charts for miscellaneous problems not appropriate for any specific trouble shooting category.
2. Trouble Symptom Listing
_______________________ Trouble Symptom_______________ Begin Trouble Shooting
High Vibration Indication Fig. 101 Block 1 Bird Strike or FOD With Fig. 102 Block 1 Normal Parameters
Bird Strike or FOD With Fig. 103 Block 1 Abnormal Parameters Or Flameout
Bird Strike or FOD With Fig. 104 Block 1 Indications of Surge (Stall) N1 and N2 Rotors Locked Together Fig. 105 Block 1
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71-00-47
ALL ú ú C02 Page 101 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
115V AC ELECTRICAL POWER AVAILABLE ENGINE OPERATION MAY BE REQUIRED
HIGH VIBRATION INDICATION
YES
1
INTERROGATE THE AVM SYSTEM
20 REPLACE THE AVM SIGNAL
TO DETERMINE HIGH VIBRATION CONDITIONER
SOURCE AND CORRESPONDING (AMM 77-31-03/401).
ENGINE SPEED
(AMM 77-31-00/201).
RECORD FOR POSSIBLE USE IN ENGINE TRIM BALANCE (AMM 72-31-00/501).
AT THE AVM SIGNAL CONDITIONER, PUSH AND RELEASE THE 'TEST' BUTTON.
DOES 'A9' APPEAR IN THE DISPLAY WINDOW?
NO YES
2 DO AVM SIGNAL CONDITIONER
21 DO THE CORRECTIVE ACTION SELF-TEST (AMM 77-31-00/501). SPECIFIED IN AMM 71-00-54/101,
ARE THERE FAULT MESSAGES? FIG. 105, BLOCK 2.
NO YES
3 CHECK ENGINE INLET AND
EXHAUST AREAS FOR FOD AND/OR
METAL PARTICLES
(AMM 71-00-58/101, FIG. 108).
IS DAMAGE OR METAL PARTICLES FOUND?
NO YES
4 _______
WARNING
HEAVY GLOVES SHOULD BE WORN TO AVOID INJURY TO HANDS.
ROTATE FAN ROTOR BY HAND. IS THERE ANY BEARING ROUGHNESS, UNUSUAL NOISE, OR BINDING?
NOTE: LIGHT RUBBING OF SEALS AND SHROUDS IS NORMAL.
NO SEE SHEET 2
(BLOCK 5)
AIRPLANES WITHOUT AVM SIGNAL CONDITIONER S360N021-100, -102, -113, -213
AIRPLANES WITH AVM SIGNAL CONDITIONER S360N021-100, -102, -113, -213
High Vibration Indication
Figure 101 (Sheet 1)
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ú C01 Page 102
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 (BLOCK 4)
NO
YES
5 CHECK MAGNETIC CHIP
DETECTORS (AMM 79-00-00/601).
IS EVIDENCE OF INTERNAL
ENGINE FAILURE FOUND?
4TH-STAGE BLADES FOR UNLATCHED BLADES
SHINGLING/UNLATCHING (AMM 72-54-00/801).
(AMM 72-00-00/601).
IS SHINGLING/UNLATCHING
FOUND?
NO YES
11 BORESCOPE INSPECT BOOSTER,
HPC 3RD-,5TH-, AND 9TH-STAGE
BLADES, HPT BLADES AND LPT
1ST-STAGE BLADES
(AMM 72-00-00/601).
IS DAMAGE BEYOND ACCEPT-ABLE LIMITS FOUND?
NO YES YES
12 VISUALLY EXAMINE ENGINE
21 MAKE AN INSPECTION OF THE
31 REPAIR/REPLACE THE ENGINE
MOUNTS FOR SIGNS OF DISCOLORI-ENGINE MOUNTS (AMM 71-21-00/ MOUNT COMPONENTS OR REPLACE
ZATION, CRACKS, CORROSION, 601; 54-42-11,-12/201). THE ENGINE (AMM 71-00-02/
WEAR, LOOSE OR MISSING IS DAMAGE BEYOND ACCEPT-401).
FASTENERS, OR OTHER SIGNS OF ABLE LIMITS FOUND?
DAMAGE.
NO
IS DAMAGE FOUND?
NO
YES
YES
YES
SEE SHEET 3 (BLOCK 15)
High Vibration Indication Figure 101 (Sheet 2)
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