# SDR UIEA2017052200830

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 15, 2017
- Submitted: May 23, 2017
- Operation: Air carrier
- Aircraft: [N475MC](https://openairdocs.org/aircraft/N475MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29252
- Aircraft time: 74,783 hours, 13,617 cycles
- System (JASC): [3233 · Landing Gear Actuator](https://openairdocs.org/jasc/3233)
- Part: Actuator
- Part number: 65B825854
- Part serial: B067
- Condition: Failed
- Location: Nlg
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2017052200830

## Discrepancy

GEAR DISAGREE EICAS MESSAGE. NOTED BY FLIGHT CREW THAT NOSE GEAR INDICATION REMAINED DASHED OUT. NLG NEVER INDICATED UP. GEAR SWING AND TROUBLESHOOTING. REPLACED DOOR OPERATED SEQUENCE VALVE, GEAR OPERATED SEQUENCE VALVE, PRIMARY LOCK SENSOR, AND NLG RETRACT ACTUATOR. PERFORMED LANDING RETRACTION TEST. ALL TESTS PASSED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.