# SDR 2003FA0000085

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 10, 2003
- Submitted: January 31, 2003
- Operation: General aviation
- Aircraft: N5JA
- Make and model: Beech 95-B55
- Registry model: [Beech 95-B55](https://openairdocs.org/model/beech-95-b55) (OpenAirDocs)
- Aircraft serial: TC942
- Engine: Cont IO470*
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Connecting Rod
- Part number: 628752
- Condition: Bent
- Location: Engine
- Part time: 3,386 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2003FA0000085

## Discrepancy

NR 5 CYLINDER WAS REMOVED FROM RIGHT ENGINE AFTER ROUGH OPERATION AT GROUND RUN UP AND COMPRESSION LOSS.  INSPECTION REVEALED BENT I BEAM SECTION OF CONNECTING ROD AND DAMAGE TO SKIRT OF PISTON.  FAILURE ANALYSIS DETERMINED CAUSE TO BE HYDROSTATIC LOCK DUE TO OVERPRIMING AT STARTUP.  NR 5 CYL OF RT ENGINE, NR 6 CYL OF LT ENGINE ARE MOST LIKELY TO HAVE THIS PROBLEM.  INDUCTION SYSTEM BALANCE TUBE NEEDS PROPERLY POSITIONED DRAIN FOR LT AND RT TO PREVENT THIS PROBLEM.

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