# SDR 2000ZZZX174

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 13, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N430MC](https://openairdocs.org/aircraft/N430MC), registered now
- Make and model: Beech 200BEECH
- Aircraft serial: BB904
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: P3 Air Line
- Condition: Failed
- Location: Left Engine
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2000ZZZX174

## Discrepancy

DURING GROUND RUN-UP, THE LEFT ENGINE WOULD ONLY DEVELOP 89 PERCENT N1 (COMPRESSOR RPM).  INSPECTION OF THE FUEL CONTROL P3 AIR LINES REVEALED A LOOSE B-NUT AT THE PROP GOVERNOR.  LEAKAGE IN THIS LINE LIMITS THE FUEL CONTROL TO 80 PERCENT (MAXIMUM REVERSE N1).  THE SAFETY WIRE FOR THE B-NUT HAD BROKEN AND ALLOW THE B-NUT TO LOOSEN.  THERE IS NO REASON EVIDENT AS TO WHY THE SAFETY WIRE BROKE.

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