# SDR 2009FA0000510

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 9, 2009
- Submitted: June 9, 2009
- Operation: General aviation
- Aircraft: N1244S
- Make and model: Cessna 337H
- Registry model: [Cessna 337H](https://openairdocs.org/model/cessna-337h) (OpenAirDocs)
- Aircraft serial: 33701892
- Aircraft time: 6,495 hours, 2,051 cycles
- Engine: Cont IO360*
- System (JASC): [7300 · Engine Fuel and Control](https://openairdocs.org/jasc/7300)
- Part: Air Filter
- Part number: P107736
- Condition: Defective
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2009FA0000510

## Discrepancy

UPON RECEIVING INSP OF NEW MFG AIR FILTERS PN P107336 IT WAS FOUND THAT 3 OUT OF 4 NEW FILTERS HAD A DEFECTIVE SEALING SURFACE CAUSING THE SEALING/MATING SURFACE TO CRACK AND CRUMBLE. THIS DEFECTIVE SEALING SURFACE COULD POTENTIALY ENTER THE ENGINE INLET. THE DEFECTIVE FILTERS HAVE A LIGHT GREY COLOR TO THE SEALING SURFACE. THE REPLACEMENT FILTERS THAT WERE LATER RECEIVED, INSPECTED, AND FOUND TO BE IN SERVICEABLE CONDITION HAD A DARK GREY ALMOST BLACK SEALING SURFACE. SUSPECT THAT THE DEFECTIVE FILTERS HAD IMPROPER MATERIAL ON THE SEALING SURFACE OR WAS IMPROPERLY CURED.

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