# SDR PNSA990704

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 31, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N7811](https://openairdocs.org/aircraft/N7811), registered now
- Make and model: Grumav G21A
- Aircraft serial: B122
- Engine: Pwa R985*
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Condition: Broken
- Location: Engine
- Stage of operation: CR
- Nature of condition: E, K
- Precautionary procedure: E, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/PNSA990704

## Discrepancy

ENGINE BEGAN TO VIBRATE IN CRUISE AND SUBSEQUENTLY LOST OIL PRESSURE.  SECURED ENGINE AND LANDED AIRCRAFT.  ENGINE REPLACED DUE TO CASE DAMAGE FROM BROKEN CYLINDER HOLD DOWN STUDS.

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