# SDR AOQ2006F00001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 11, 2006
- Submitted: March 20, 2006
- Operation: Air carrier
- Aircraft: N39TW
- Make and model: Lear 31A
- Registry model: [Lear 31A](https://openairdocs.org/model/learjet-31a) (OpenAirDocs)
- Aircraft serial: 047
- Engine: Garrtt TFE731*
- System (JASC): [3230 · Landing Gear Retraction/Extension System](https://openairdocs.org/jasc/3230)
- Part: Selector Valve
- Part number: 48C48641
- Condition: Intermittent
- Location: Ng Hyd Sys
- Part time: 4,442 hours
- Stage of operation: TO
- 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/AOQ2006F00001

## Discrepancy

NOSE GEAR UNSAFE LIGHT REMAINED ILLUMINATED UPON GEAR RETRACTION.  CREW RECYCLED GEAR AND ALL LIGHTS EXTINGUISHED.  MAINTENANCE INSPECTED LANDING GEAR SYSTEM AND FOUND NOSE LANDING GEAR TO BE LAGGING DURING OPERATION.  TROUBLESHOT SYSTEM TO GEAR SELECTOR VALVE.  REPLACED SELECTOR VALVE WITH NEW AND OPERATIONAL CHECK OF GEAR FOUND TO BE SATISFACTORY.  (K)

---
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.