# SDR ZESA20160331001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 30, 2016
- Submitted: March 31, 2016
- Operation: Air carrier
- Aircraft: N36UP
- Make and model: Lear 31A
- Registry model: [Lear 31A](https://openairdocs.org/model/learjet-31a) (OpenAirDocs)
- Aircraft serial: 238
- Aircraft time: 1,848 hours, 1,501 cycles
- System (JASC): [3234 · Landing Gear Selector](https://openairdocs.org/jasc/3234)
- Part: Switch
- Part number: 8858K44
- Condition: Jammed
- Location: Cockpit
- Part time: 1,848 hours, 1,501 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ZESA20160331001

## Discrepancy

AFTER TAKEOFF THE COPILOT ATTEMPTED TO PUT THE GEAR UP & THE SWITCH WOULD NOT RELEASE FROM THE DOWN POSITION.  THEY RETURNED TO THE AIRPORT THEY TOOK OFF FROM.  FURTHER INVESTIGATION FOUND THE GEAR HANDLE IS A KNOB, PN 0813502-1, ON A TOGGLE SWITCH PN 8858K44.  THE KNOB IS ATTACHED & SCREWED ONTO THE TOGGLE PORTION OF THE SWITCH THAT HAS A SPRING LOADED TOGGLE, TURN THE KNOB TO TIGHT & IT WILL JAM THE SPRING MECHANISM.  THE KNOB WAS ADJUSTED & THE SPRING MECHANISM WAS RELEASED TO OPERATE CORRECTLY.

---
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.