# SDR CA960110201

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Make and model: Doug C-54A
- Registry model: [Doug C-54A](https://openairdocs.org/model/douglas-c-54a) (OpenAirDocs)
- Engine: Pwa R20007M2
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve Seat
- Condition: Loose
- Location: Nr 8 Cylinder
- Stage of operation: CR
- Nature of condition: E, R
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA960110201

## Discrepancy

(CAN)IN CRUISE FLIGHT #4 ENGINE BEGAN TO RUN ROUGH ACCOMPANIED BY BACKFIRING THROUGH THE INDUCTION SYSTEM. THE ENGINE WAS SHUTDOWN. POST FLIGHT INSPECTION DISCLOSED THE #8 CYLINDER INTAKE VALVE SEAT HAD CA ME ADRIFT, PREVENTING THE INTAKE VALVE FROM CLOSING.

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