- if LPT Stage 4 blades shingling, use procedure (Ref. AMM TASK 72-54-00-290-006).
(2) If checks are correct:
- do a Cold Trim Balance per specific procedure Fan Trim Balance (Ref. AMM TASK 71-00-00-750-001).
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(3) If the same crew observation is still reported during following flight(s):
- do a relubrication of the fan blades mid-span shrouds and dovetails R (Ref. AMM TASK 72-21-00-210-004).
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TASK 77-00-00-810-863
Fan Vibrations Higher than or Equal to 4 Units and less than 6 Units on Engine 1 or 2
1. Possible Causes
_______________
- wiring, connectors and receptacles
- No. 1 bearing vibration sensor
- TRF vibration sensor
- EVMU
- fan blades
- LPT Stage 4 blades
- fan blades mid-span shrouds
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific bristle brush
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2011 *
Stoddard solvent (Ref. 70-30-00)
C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-00-00-750-001 Fan Trim Balance - 1 Sensor 3 Speed R AMM 72-21-00-210-004 Detailed Inspection and Relubrication of Fan Blade R Dovetails, Midspan Shrouds, Retainers, Spacers, R Dampers and Fan Disk Dovetail Slots
AMM 72-21-00-210-009 Inspect Fan Rotor Blades Installed on the Fan Disk AMM 72-54-00-290-006 Inspection of the Stage 4 Blades AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 77-31-30-000-002 Removal of the Turbine Rear Frame Vibration Sensor AMM 77-32-34-710-040 Operational Check of EVMU through CFDS AMM 77-32-34-860-041 Change the configuration of the Accelerometer ASM 77-32/02
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A. Test
(1) Not applicable, the fault is evident.
4. Fault Isolation
_______________
A. If the fault symptom is identified on the lower ECAM display unit by the crew observation: ENG 1(2)-FAN VIBRATION higher than or equal to 4 units and less than 6 units:
NOTE : Trouble Shooting is recommended at next maintenance opportunity
____ not interfering with Revenue Service operation.
(1) Do the following checks if no aircraft structure vibration/rumble was reported by reported by the crew.
NOTE : If momentary vibration on ECAM is greater than 4 units but in
____ order of less than 1 minute, no maintenance action is required provided indication is no associated with aircraft vibration felt by the crew and the indication did not repeat during the flight or following flights.
(a) Do a check of the wiring, connectors and receptacles between (Ref. ASM 77-32/02):
- the No. 1 vibration sensor (4002EV) to the EVMU (2EV)
- the TRF vibration sensor (4003EV) to the EVMU (2EV).
(b) Check for damaged pins or connector oxidation:
(c) Do an electrical test of the No. 1 bearing vibration sensor and the TRF vibration sensor:
1_ If damage is found, repair or replace as necessary.
2_ Do a cleaning of the connectors using a bristle brush with
Stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-
50-210-002).
1 Disconnect the aircraft harness from the vibration sensor. If 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 发动机指示(86)
