# SDR A8JA201502120020

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 12, 2015
- Submitted: February 13, 2015
- Operation: Air carrier
- Aircraft: N942RC
- Make and model: Lear 31A
- Registry model: [Lear 31A](https://openairdocs.org/model/learjet-31a) (OpenAirDocs)
- Aircraft serial: 107
- Aircraft time: 4,985 hours, 4,284 cycles
- System (JASC): [2740 · Stabilizer Control System](https://openairdocs.org/jasc/2740)
- Part: Trim System
- Condition: Malfunctioned
- Location: Horiz Stab
- Stage of operation: IN
- How discovered: C
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/A8JA201502120020

## Discrepancy

ON 2/12/2015 WHILE ON GND PREPARING FOR A RETURN FLIGHT, BEFORE ENG START, FLIGHT CREW MEMBERS WERE CONDUCTING PREFLIGHT CHECKS ON ACFT SYSTEMS.  FLIGHT CREW NOTICED AUTOPILOT WOULD NOT PASS INTERNAL CHECKS & THE RED PITCH TRIM LIGHTS WERE ILLUMINATED ON THE AUTOPILOT PANEL.  FURTHER INVESTIGATION REVEALED THE SEC PITCH TRIM CB WAS OPEN.  FLIGHT CREW REFERRED TO CHECKLIST & TRIED CLOSING CB ONLY TO HAVE IT TRIP WITHIN A FEW SECONDS.  FLIGHT CREW REVIEWED CHECKLIST, MEL & AFM, DETERMINED THAT TRIM SYS COULD NOT BE DEFERRED.  DISCUSSED ISSUE WITH MANUFACTURER & SUSPECT PITCH TRIM ADAPTER PN 065-5046-01.  ACFT WAS ISSUED SPECIAL FLIGHT PERMIT TO BE REPOSITIONED FOR TROUBLESHOOTING & REPAIRS.

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