What was found
AIRCRAFT HAD ENGINE FAILURE AT 79 FLIGHT HOURS. THE NR 1 CYLINDER EXHAUST VALVE SEAT CAME LOOSE FROM THE CYLINDER AND CAUSED SIGNIFICANT DAMAGE TO THE ENGINE. THE OUTSIDE DIAMETER OF THE EXHAUST VALVE SEAT WAS FOUND UNDERSIZED. (X)
- Difficulty date
- July 14, 2000
- Submitted
- July 14, 2000
- Operation
- General aviation
- Aircraft
- N2638U
- Make and model
- Cessna T206H
- Aircraft serial
- T20608061
- Engine
- Lyc TIO540AF1A
- System (JASC)
- 8530 · Reciprocating Engine Cylinder Section
- Part
- Valve Seat
- Condition
- Loose
- Location
- Exhaust
- Stage of operation
- CR
- How discovered
- V
- Nature of condition
- R
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.