# SDR 2004FA0000771

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2004
- Submitted: September 28, 2004
- Operation: General aviation
- Aircraft: [N19674](https://openairdocs.org/aircraft/N19674), registered now
- Make and model: Cessna 172L
- Registry model: [Cessna 172L](https://openairdocs.org/model/cessna-172l) (OpenAirDocs)
- Aircraft serial: 17260657
- Engine: Lyc O320E2D
- Propeller: Mcauly 1C160DTM
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder Head
- Part number: AEL65102ST041
- Part serial: 149618210021
- Condition: Failed
- Location: Engine
- Part time: 820 hours
- Stage of operation: NR
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2004FA0000771

## Discrepancy

STUDENT AND INSTRUCTOR WERE FLYING, HEARD LOUD BANG.  AC SHUTTERED, OIL PRESSURE STABLE, RPM DROPPED TO BOTTOM OF GREEN ARC, OIL PRESSURE STARTED DROPPING ON A PRECAUTIONARY APPROACH.  NORMAL LANDING, SHUT ENGINE DOWN AT SOUTH BAY AVIATION.  UPON INSP OF ENG IT WAS DETERMINED.  NR3 CYLINDER HEAD SEPARATED FROM CYLINDER.  REPLACED NR 3 CYLINDER ASSY.

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