TASK 77-00-00-810-866
 Core Vibrations Higher than or Equal to 5.5 Units (2.2 Ips) on Engine 1 or 2
 1. Possible Causes
_______________
 - wiring, connectors and receptacles

 - No. 1 bearing vibration sensor (4002EV)

 - TRF vibration sensor (4003EV)

 - EVMU (2EV)

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific bristle brush
 No specific megohmeter
 No specific soft nose pliers

 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2011  *
 stoddard solvent (Ref. 70-30-00)

 C. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-11-00-210-001 Visual Inspection of the Air Intake Cowl AMM 71-50-00-210-001 Visual Inspection of the Power Plant Wire Harness AMM 72-31-00-290-002 Inspection of the High Pressure Compressor Rotor
 Assembly AMM 72-52-00-290-001 Borescope Inspection of the High-Pressure Turbine
 Blades (from the rear) 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 77-31-30-400-002 Installation 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 AMM 79-00-00-281-002 Check of the Electrical Master Chip Detector for
 Particles
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 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 79-00-00-281-003  Check of FWD, AFT Sump, AGB, and TGB scavenge screens
 AMM 79-35-00-040-042  Replacement of the Main Oil Supply Filter and Check of the Electrical Chip Detector Visual Indicator (pop-out)
 ASM 77-32/02
 3. Fault Confirmation
__________________
 A. Test
 (1) Read the advisory report <07> PRE EVENT and POST EVENT to confirm the interval of time.
 NOTE : Trouble shooting is required before next flight.
____
 4. Fault Isolation
_______________
 A. If momentary vibration on ECAM is greater than 5.5 units but in order of less than 1 minute and provided indication did not repeat during the flight or following flights:
 - no maintenance action is required.
 (1) If the fault symptom is identified on the lower ECAM display unit by the crew observation ENG1/2 - CORE VIB higher than or equal to 5.5 units with core vibration indication flashing green and greater than
 5.5 units for less than one minute, but intermittently repeated:
 (a) Do a check of the wiring, connectors and receptacles (Ref. ASM 77-32/02) between:

 - the No. 1 bearing vibration sensor (4002EV) and the EVMU (2EV),

 - the TRF vibration sensor (4003EV) and the EVMU (2EV).

 (b) Disconnect the harnesses from the No. 1 bearing and the TRF sensors.

 - do a check for damaged pins or connector oxidation (Ref. AMM TASK 71-50-00-210-001).
 1 If damage is found:
_ - repair or replace as required.
 2 If no damage is found:
_
 - do a cleaning of the connectors using a bristle brush with stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).
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 (c) Do an electrical test of the No. 1 bearing vibration sensor and the TRF vibration sensor:
 - disconnect the aircraft harness from the vibration sensor connectors. If necessary, use soft nose pliers.

 - measure the insulation resistance with a megohmeter 0-100 megohms, V=45VDC between: . pins 1 and 2 . pins 1 and 3 . pin 2 and connector body . pin 3 and connector body, the insulation resistance is expected to be greater than 20 megohms.
　
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