# SDR 2016FA0000402

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 31, 2016
- Submitted: August 31, 2016
- Operation: General aviation
- Aircraft: [N4818D](https://openairdocs.org/aircraft/N4818D), registered now
- Make and model: Cessna 172N
- Registry model: [Cessna 172N](https://openairdocs.org/model/cessna-172n) (OpenAirDocs)
- Aircraft serial: 17272367
- Aircraft time: 2,679 hours
- Engine: Lyc O360A4M
- Engine time: 1,168 hours
- Propeller: Snsnch 76EM8
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder Head
- Part number: LW12427
- Part serial: 114482
- Condition: Cracked
- Location: Nr 1
- Part time: 1,168 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2016FA0000402

## Discrepancy

ENGINE FOUND TO MAKE WHISTLING SOUND WHEN PROP PULLED THROUGH ON PRE-FLIGHT. INSPECTION FOUND THE NR 1 CYLINDER HEAD CRACKED AFT OF THE INTAKE VALVE. CRACK LENGTH APPROXIMATELY 2 INCHES IN LENGTH.  THIS CYLINDER PRESSURE CHECKED GOOD 5.98 HOURS EARLIER WHEN IT WAS FOUND THAT THE NR 3 CYLINDER HAD THE SAME CRACK AND NEEDED TO BE REPLACED.

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