# SDR P9KA2011F00167

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 20, 2011
- Submitted: July 20, 2011
- Operation: Air carrier
- Aircraft: [N777DH](https://openairdocs.org/aircraft/N777DH), registered now
- Make and model: Dhav DHC2MK1
- Aircraft serial: 47
- Aircraft time: 18,696 hours
- Engine: Pwa R985AN14B
- Engine time: 10,688 hours
- Propeller: Hartzl HCB3R304
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Exhaust Valve
- Part number: 71166
- Condition: Cracked
- Location: Engine
- Part time: 1,157 hours
- Component: Cylinder, Pwa
- Component part number: 399353
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P9KA2011F00167

## Discrepancy

ON ENGINE SHUTDOWN A SUCKING SOUND WAS HEARD AS ENGINE DIED.  CYLINDER COMPRESSION CHECK WAS 0/80.  AFTER STAKING THE VALVE THE COMPRESSION WAS STILL 0/80.  AIR WAS HEARD COMING FROM THE EXHAUST PIPE.  AFTER REMOVING THE EXHAUST STACK FROM THE CYLINDER,  A CRACK AROUND THE VALVE STEM WAS NOTICED BY THE MX.  CYLINDER WAS REMOVED FROM THE ACFT AND A SERVICEABLE CYLINDER WAS INSTALLED.  VALVE WAS REMOVED FROM CYLINDER AND A CRACK WAS SEEN AROUND ABOUT 2/3 OF THE VALVE FACE. THE VALVE REMAINED INTACT.

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