# SDR HYIA20180430001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 27, 2018
- Submitted: April 30, 2018
- Operation: Air carrier
- Aircraft: [N256CA](https://openairdocs.org/aircraft/N256CA), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: 402C0606
- Aircraft time: 23,934 hours
- Engine: Cont TSIO520VB
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Exhaust Valve
- Condition: Broken
- Location: Engine
- Part time: 310 hours
- Stage of operation: CL
- How discovered: O
- Nature of condition: E, R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HYIA20180430001

## Discrepancy

PILOT REPORTED IN CLIMB POWER, AIRCRAFT YAWED AND SEVERE ENGINE VIBRATION ENSUED. UPON INSPECTION MAINTENANCE FOUND THE CYLINDER TO HAVE ZERO COMPRESSION AND THE EXHAUST VALVE BROKEN AT THE STEM. THE CYLINDER WAS REPLACED WITH NO FURTHER DEFECTS NOTED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.