# SDR CALA2019082301425

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 22, 2019
- Submitted: August 23, 2019
- Operation: Air carrier
- Aircraft: [N656UA](https://openairdocs.org/aircraft/N656UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25394
- Aircraft time: 108,021 hours, 16,659 cycles
- System (JASC): [2731 · Elevator Tab Control System](https://openairdocs.org/jasc/2731)
- Part: Warning Message
- Condition: False Activation
- Location: Horizontal Stab
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2019082301425

## Discrepancy

HORIZONTAL STABILIZER TRIM CONTROL SYSTEM EICAS MESSAGE, UNSCHED STAB TRIM DISPLAYED, UNSCHED STAB TRIM LGT ON WITH AUTOPILOT OFF. NEITHER STAB TRIM CUTOUT SWITCH RE-ESTABLISHED CONTROLLED STAB TRIM, ONLY RECEIVED THE MESSAGE WHEN USING ALTERNATE TRIM SWITCHES.  NO FAULT USING CONTROL WHEEL TRIM SWS. WHEN HAND FLYING. PERFORMED FIM TASK 27-09-00-815-813, PERFORMED TEST 65, NO FAULTS NOTED, TEST PASSED. PERFORMED TEST 30, TEST PASSED, NO FAULTS. AIRCRAFT REMAINS FULL CAPABILITY.

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