# SDR 0913200601

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 10, 2006
- Submitted: September 13, 2006
- Operation: Air carrier
- Aircraft: [N535MC](https://openairdocs.org/aircraft/N535MC), registered now
- Make and model: Boeing 747-2F6B
- Registry model: [Boeing 747-2F6B](https://openairdocs.org/model/boeing-747-2f6b) (OpenAirDocs)
- Aircraft serial: 21833
- Aircraft time: 88,366 hours, 18,275 cycles
- System (JASC): [7710 · Power Indicating System](https://openairdocs.org/jasc/7710)
- Part: Sensor
- Part number: 473271
- Part serial: SIM02355
- Condition: Failed
- Location: Nr 4 Engine
- Stage of operation: TO
- How discovered: V
- Nature of condition: N
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/0913200601

## Discrepancy

(MIA) - WHEN SETTING POWER ABOVE 70 PERCENT NR 4 ENGINE N1 WENT OFF SCALE LOW.  ABORTED BELOW 60 KTS AND WHEN PULLED BACK NR 4 N1 CAMBE BACK.  DID NOT ACCOMPLISH HIGH ENERGY STOP.  REMOVED AND REPLACED NR 4 ENGINE N1 TACH TRANSMITTER.  OPERATIONAL CHECK SATISFACTORY IAW MM 77-12-01, AIRCRAFT RETURN TO SERVICE.

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