(4) If the vibration continues with engine N1 vib less than 2 units, cold trim balance the engine using the vectorial method with the 51% N1 speed only, using current vib manual input option, according to EVMU flight data print.
NOTE : In SCREWS TO CHANGE menu, push the line key adjacent to the
____ UPDATE indication to memorize the EVMU calculation.
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R **ON A/C 051-051,
R A. Balance the engine with the CFM Trim Balance Software, using the actual
R flight data prints :
R (1) Cold trim balance the engine using One Shot method (2 sensors, 5
R speeds) (Ref. AMM TASK 71-00-00-750-001)
R - Dispatch the aircraft.
R (2) If the vibration continue, Cold trim balance the engine using
R Vectorial method (Ref. AMM TASK 71-00-00-750-001)
R - Dispatch the aircraft.
R (3) If the vibration continue with engine N1 vib higher than 2 units, go
R to step(2)
R (4) If the vibration continue with engine N1 vib less than 2 units, Cold
R trim balance the engine using Vectorial method with the 51 % N1 speed
R only : input only 51% N1 data into the software.
R - Dispatch the aircraft.
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TASK 77-00-00-810-917
Vibration with Noise at approximately 51% N1 on Engine 2
1. Possible Causes
_______________
2. Job Set-up Information
______________________
A. Referenced Information
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REFERENCE DESIGNATION
-------------------------------------------------------------------------------
R AMM 71-00-00-750-001 Fan Trim Balance - 1 sensor 3 speed AMM 77-32-34-750-001 Fan Trim Balance with the EVMU (one Shot Method) AMM 77-32-34-750-001 Fan Trim Balance with the EVMU (Vectorial Method) AMM 77-32-34-860-042 Acquire Unbalance Data During the Flight and Read Unbalance Data
3. Fault Confirmation
__________________
A. Prior to perform the fault isolation, the flight vibration data must be available for the engine speeds listed below:
---------------------------------------------| N1 SPEED | | | ---------------------| | | | A319 | A321 | N1 tolerance | Time | | A320 | | | | ---------------------------------------------| 51% | 51% | 2% | 15sec.| | 64% | 64% | 2% | 15sec.| | 84% | 88% | 2% | 15sec.| | 88% | 92% | 2% | 15sec.| | 92% | 96% | 2% | 15sec.| ---------------------------------------------
- if these data are not available acquire these values and do the fault isolation at the first opportunity (Ref. AMM TASK 77-32-34-860-042).
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4. Fault Isolation
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R **ON A/C 001-049, 052-099, 101-149, 151-199, 201-299, 301-399, 401-499,
A. Balance the engine with the EVMU using the flight data as follows:
NOTE : For information, hereafter are the CFM56-5B One Shot Coefficients:
____
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