# SDR ZESA20120411001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 30, 2012
- Submitted: April 11, 2012
- 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: 1,640 hours, 1,301 cycles
- System (JASC): [2742 · Stabilizer Actuator](https://openairdocs.org/jasc/2742)
- Part: Actuator
- Part number: 3135540014
- Part serial: 109
- Condition: Failed
- Location: Stab Trim
- Part time: 208 hours, 175 cycles
- Stage of operation: DE
- How discovered: O
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ZESA20120411001

## Discrepancy

DURING DESCENT, TRIED TO USE PRIMARY HORIZONTAL STABILIZER TRIM AND IT WOULD NOT TRIM TO NOSE UP, ONLY DOWN.

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