# SDR 2001F00006

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 22, 2001
- Submitted: June 4, 2001
- Operation: Air carrier
- Aircraft: [N57MH](https://openairdocs.org/aircraft/N57MH), registered now
- Make and model: Lear 55LEAR
- Aircraft serial: 55113
- System (JASC): [3230 · Landing Gear Retraction/Extension System](https://openairdocs.org/jasc/3230)
- Part: Uplock
- Part number: 24170161
- Condition: Corroded
- Location: Nlg
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2001F00006

## Discrepancy

AS PART OF A SCHEDULED INSPECTION BEING PERFORMED, AN EMERGENCY EXTENSION CHECK OF THE LANDING GEAR WAS PERFORMED.  NITROGEN WAS HEARD LEAKING FROM THE LEFT SIDE NOSE WHEEL WELL AREA.  FURTHER TROUBLESHOOTING REVEALED THE NOSE LANDING GEAR UPLOCK ACTUATOR (PNEUMATIC) TO BE LEAKING BY THE PISTON SHAFT AREA.  CONSIDERABLE CORROSION WAS FOUND INTERNALLY (PISTON SPRING & CYLINDER SHAFT AREA).

---
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.