(2) If this indication was not associated to the ECAM warning ENG 2 N2 OVERLIMIT, and not associated to any engine malfunction such as N1 auto acceleration, N1 OVERLIMIT, N1 fluctuations:
(a) no action is required, the indication is spurious.
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- do the applicable trouble shooting procedure. Refer to the crew observation entry or ECAM warning entry ATA 77.
(3) If the fault becomes repetitive:
- inspect the HJ7/HJ8 harness and associated connectors to the N2 speed sensor and ECU for signs of looseness, damage or contamination. Clean, repair or replace as required (Ref. AMM TASK 73-21-50-000-008) and (Ref. AMM TASK 73-21-50-400-008) and (Ref. AMM TASK 73-21-50-000-009) and (Ref. AMM TASK 73-21-50-400-009).
(a) If nothing is found:
- replace the SENSOR-N2 ROTATIONAL SPD (4001EV) (Ref. AMM TASK 77-11-20-000-002) and (Ref. AMM TASK 77-11-20-400-002).
(b) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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TASK 77-00-00-810-916
Vibration with Noise at approximately 51% N1 on Engine 1
1. Possible Causes
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2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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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
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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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| | N1 bearing vib sensor | TRF vib sensor |
|-----|---------------------------------|---------------------------------|
| N1% | One Shot | One Shot | One Shot | One Shot |
| | coefficient | coefficient | coefficient | coefficient |
| | cmg/mils da | lag phase degrees | cmg/mils da | lag phase degrees |
|-----|-------------|-------------------|-------------|-------------------|
| 96 | 205 | 160 | 305 | 185 |
| 92 | 235 | 175 | 330 | 225 |
| 88 | 300 | 200 | 400 | 245 |
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