# SDR AW42004F00000

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 23, 2004
- Submitted: April 12, 2004
- Operation: Air carrier
- Aircraft: [N3911G](https://openairdocs.org/aircraft/N3911G), registered now
- Make and model: Cessna 340A
- Registry model: [Cessna 340A](https://openairdocs.org/model/cessna-340a) (OpenAirDocs)
- Aircraft serial: 340A0230
- Engine: Cont TSIO520NB
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve
- Part number: SA643873
- Condition: Broken
- Location: Nr2 Cylinder
- Part time: 950 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: R, E, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AW42004F00000

## Discrepancy

DURING CRUISE, THE EGT INDICATION FOR THE NR 2 CYL OF THE RT ENGINE DROPPED TO ZERO.  THIS WAS ACCOMPANIED BY VIBRATION, SLIGHT LOSS OF MANIFOLD PRESSURE AND A SLIGHT DECREASE IN THE CHT AND EGT INDICATIONS FOR CYLINDERS NR 4 AND NR 5.  RETURNED TO DEPARTURE BASE.  ENGINE WAS NOT SHUT DOWN.  UPON COMPRESSION CHECK, NR 2 CYLINDER WAS FOUND WITH ZERO COMPRESSION.  A BORESCOPE INSPECTION REVEALED A FAILURE OF THE EXHAUST VALVE.  INSPECTION OF THE OTHER CYLINDERS ALSO SHOWED CONSIDERABLE DAMAGE TO NR 5 CYL AND MINOR DAMAGE TO SEVERAL OTHERS.  WHEN INDUCTION SYSTEM BALANCE TUBE WAS REMOVED, A PIECE OF VALVE WAS FOUND. (WP272003B2874)

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