# SDR UIEA2014062400249

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 24, 2014
- Submitted: June 28, 2014
- Operation: Air carrier
- Aircraft: [N747BC](https://openairdocs.org/aircraft/N747BC), registered now
- Make and model: Boeing 747-4J6
- Registry model: [Boeing 747-4J6](https://openairdocs.org/model/boeing-747-4j6) (OpenAirDocs)
- Aircraft serial: 25879
- Aircraft time: 36,237 hours, 9,933 cycles
- System (JASC): [3250 · Landing Gear Steering System](https://openairdocs.org/jasc/3250)
- Part: Metering Valve
- Part number: 2670005M7
- Part serial: 1890E
- Condition: Faulty
- Location: Nlg Steering
- Stage of operation: TO
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2014062400249

## Discrepancy

DURING THE TAKEOFF ROLL EXPERIENCED MEDIUM TO SEVERE NOSE WHEEL VIBRATIONS.  BEGAN AT APPROXIMATELY 30KTS & DID NOT STOP UNTIL LONG AFTER GEAR RETRACTION.  ACCOMPLISHED FIM 32-51-00 FIGURE 403.  R & R STEERING METERING VLV IAW AMM 32-51-04.

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