# SDR HYIA20161205001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 1, 2016
- Submitted: December 5, 2016
- Operation: Air carrier
- Aircraft: [N401TJ](https://openairdocs.org/aircraft/N401TJ), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: 402C0109
- Aircraft time: 24,884 hours, 34,018 cycles
- Engine: Cont TSIO520VB
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Exhaust Valve
- Condition: Failed
- Location: Nr 5 Cylinder
- Part time: 2,306 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HYIA20161205001

## Discrepancy

PILOT REPORTED "LEFT ENGINE RUNNING ROUGH AND WON'T IDLE BELOW 500 RPM". UPON INSPECTION MAINTENANCE FOUND THE NR 5 CYLINDER WAS READING ZERO COMPRESSION DUE TO AN EXHAUST VALVE CRACKED IN HALF. MAINTENANCE REPLACED THE CYLINDER AND PISTON ASSEMBLY WITH NO FURTHER DEFECTS NOTED.

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