# SDR 96ZZZX4625

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 20, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N22640](https://openairdocs.org/aircraft/N22640), registered now
- Make and model: Robsin R22BETA
- Aircraft serial: 0502
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Transmission
- Part number: A0061
- Condition: Leaking
- Location: M/R
- Part time: 2,120 hours
- Stage of operation: IN
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX4625

## Discrepancy

DURING PRE-FLIGHT INSPECTION, PILOT NOTICED A PUDDLE OF OIL (BLUE IN COLOR) ON THE GROUND BENEATH THE HELICOPTER.  INSPECTION OF THE HELICOPTER BY A MAINTENANCE TECHNICIAN REVEALED TRANSMISSION OIL WAS  LEAKING FROM THE LOWER TRANSMISSION HOUSING COVER PARTING SURFACE.  INSPECTION OF TRANSMISSION COVER AFTER DISASSEMBLY REVEALED POROSITY IN AREA OF O-RING SEALING SURFACE OF THE COVER.  THE O-RING SHOWS INDICATION OF POROSITY TRANSFER MARKS IN O-RING.

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