# SDR 96ZZZX4379

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 18, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N3122U](https://openairdocs.org/aircraft/N3122U), registered now
- Make and model: Beech A36
- Registry model: [Beech A36](https://openairdocs.org/model/beech-a36) (OpenAirDocs)
- Aircraft serial: E2431
- System (JASC): [2820 · Aircraft Fuel Distribution System](https://openairdocs.org/jasc/2820)
- Part: O-Ring
- Part number: MS28775111
- Condition: Wrong Part
- Location: Drain Valve
- Part time: 95 hours
- Component: CCA3400
- Stage of operation: IN
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX4379

## Discrepancy

THE FUEL DRAIN VALVES MANUFACTURED BY CURTIS USE SPECIAL SEALS THAT ARE COMPOUNDED OF MATERIALS SPECIFICALLY DESIGNED TO RESIST AVIATION FUEL.  MORE IMPORTANTLY, THE SEALS ARE SPECIALLY SHAPED (MOST LOOK LIKE A SMALL PANCAKE WITH A HOLE IN THE MIDDLE) TO FIT CURTIS VALVES.  THE CORRECT REPLACEMENT SEAL FOR THIS VALVE IS P/N CCA1319.  GENERIC O-RINGS MAY NOT PROVIDE ADEQUATE SEALING OR PROTECTION AGAINST CHEMICAL ATTACK BY AVIATION FUEL.  IN-FLIGHT LEAKAGE COULD RESULT IN A REDUCTION OF AN AIRCRAFT'S RANGE OR ENDURANCE, OR CREATE FIRE HAZARD.

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