# SDR NOCA03812

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 29, 2012
- Submitted: May 3, 2012
- Operation: Air carrier
- Aircraft: [N767NA](https://openairdocs.org/aircraft/N767NA), registered now
- Make and model: Boeing 767324
- Aircraft serial: 27570
- System (JASC): [7700 · Engine Indicating System](https://openairdocs.org/jasc/7700)
- Part: Sensor
- Part number: 8TJ163AAB1
- Part serial: GDBC0239
- Condition: Inoperative
- Location: Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NOCA03812

## Discrepancy

ACFT HAD AN AIR-TURNBACK DUE TO RIGHT ENGINE N1 ERRATIC JUMPIMG BETWEEN 88.2 - 82.0 N2 JUMPING BETWEEN 94.3 - 94.9 STBY ENGINE INDICATOR MATCHED EICAS DISPLAY.  REMOVED AND REPLACED N1 SPEED SENSOR AS PER MM 77-12-01 OPS CHECK AND LEAK CHECK GOOD, REMOVED AND REPLACED N2 SPEED SENSOR AS PER MM 77-12-02 REMOVED AND REPLACED CIT SENSOR AS PER MM 73-21-02 ALL OPS CHECK AND LEAKS CHECK GOOD

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