# SDR AU971566

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 27, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Make and model: Boeing 767277
- System (JASC): [3232 · Landing Gear Door Actuator](https://openairdocs.org/jasc/3232)
- Part: Piston Seat
- Part number: 21ANSETTSN
- Condition: Fractured
- Location: Nlg Valve
- Stage of operation: CL
- Nature of condition: E, J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AU971566

## Discrepancy

(AUS) AFTER TAKE-OFF, THE GEAR DOOR DISAGREE MESSAGE WARNING DISPLAYED AND EXCESSIVE NOSE GEAR VIBRATIONS WERE FELT DURING GEAR RETRACTION.  GROUND INVESTIGATION FOUND THAT THE NLG PRIORITY VALVE'S PISTON SEAT ASSEMBLY PNO 01715201B2-1 HAD FRACTURED PREVENTING BALL PNO MS134359 FROM SEATING.

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