# SDR 99UAL900484

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 19, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N986UA
- Make and model: Boeing 737291
- Aircraft serial: 21748
- Engine: Pwa JT8D17
- System (JASC): [3211 · Main Landing Gear Attach Section](https://openairdocs.org/jasc/3211)
- Part: Beam
- Part number: 6546108X
- Condition: Fractured
- Location: Rt Mlg
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900484

## Discrepancy

DURING ROUTINE GEAR SWINGS, THE RIGHT MAIN GEAR WAS PINNED WHEN THE RIGHT MAIN GEAR WALKING BEAM (BOEING P/N 65-46108-X) FRACTURED TWO INCHES FROM THE OUTSIDE DIAMETER OF THE SLOTTED BEARING RACE.  *S/D*  THE RIGHT MAIN LANDING GEAR ACTUATOR WALKING BEAM FRACTURE WAS CAUSED BY STRESS CORROSION CRACKING INDUCED BY A CORROSION PIT.  REPLACED THE WALKING BEAM.

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