# SDR YAAA20150409013

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 9, 2015
- Submitted: April 9, 2015
- Operation: Air carrier
- Aircraft: N7318U
- Make and model: Cessna 207A
- Registry model: [Cessna 207A](https://openairdocs.org/model/cessna-207a) (OpenAirDocs)
- Aircraft serial: 20700396
- Aircraft time: 19,295 hours
- Engine: Cont IO520F
- Engine time: 5,648 hours
- Propeller: Hartzl PHCC3YF1
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder Head
- Part number: SA52006A1
- Part serial: PMA526B1413414
- Condition: Cracked
- Location: Nr 4
- Part time: 749 hours
- Component: Engine, Cont, IO520F
- Component part number: IO520F
- Stage of operation: IN
- How discovered: B
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/YAAA20150409013

## Discrepancy

DURING 100HR INSPECTION BORESCOPING ENG, FOUND NR 4 CYLINDER CRACKED AT LOWER SPARKPLUG BOSS.

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