# SDR 9JLA2022011833916

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 12, 2022
- Submitted: January 18, 2022
- Operation: Air carrier
- Aircraft: [N87SK](https://openairdocs.org/aircraft/N87SK), registered now
- Make and model: Lear 45LEAR
- Aircraft serial: 45317
- Aircraft time: 4,740 hours, 3,563 cycles
- System (JASC): [7830 · Engine Thrust Reverser](https://openairdocs.org/jasc/7830)
- Part: Unlock Switch
- Part number: DS1594
- Condition: Faulty
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D, H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9JLA2022011833916

## Discrepancy

THE FLIGHT CREW REPORTED THAT DURING PERFORMING TR CHECKS PRIOR TO TAKEOFF RECIEVING A LH REV FAULT CAS MESSAGE. THE MESSAGE COULD NOT BE CLEARED. OPERATIONS WERE CONTIUNED PER MEL 78-30-01-02. DURING THE MAINTENANCE EVENT THE MX TEAM TROUBLESHOT AND DETERMINE THE INBD AND OTBD LATCH/UNLATCH SWITCHES (S2 AND S4) WERE FAULTY AND WERE REPLACED WITH NEW SWITCHES. RIGGING AND OPS CHECKS WERE SATISFACTORY. THIS CLEARED THE MEL AND THE AIRCRAFT WAS RETURNED TO SERVICE.

---
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.