# SDR CALA2026012013112

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 18, 2026
- Submitted: January 20, 2026
- Operation: Air carrier
- Aircraft: [N76515](https://openairdocs.org/aircraft/N76515), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31623
- Aircraft time: 54,922 hours, 19,958 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Indicator
- Condition: Faulted
- Stage of operation: CR
- 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/CALA2026012013112

## Discrepancy

ON DEPARTURE SPEED TRIM FAIL LIGHT ILLUMINATED TWO TIMES. COULD NOT ENGAGE A/P CMD A OR B. DEBRIEFED CREW, CREW FOUND THE AUTOPILOT STAB TRIM SWITCH IN THE CUTOFF POSITION. THEY STATED THEY MUST OF MISSED IT ON THEIR PREFLIGHT CHECK. BUT THE SPEED TRIM INOP CAME ON AND OFF 2 TIMES DURING THE FLIGHT. PERFORMED SPEED/STAB TRIM SURFACE TEST REF. BITE LIBRARY TEST 22-11-00. GROUND CHECKS GOOD. PERFORMED DFCS BITE PROCEDURE 22-11 TASK 801. GROUND CHECKS GOOD.  PERFORMED THE DFCS LAND VERIFY TEST IAW MM 22-11-00. GROUND CHECKED GOOD. THE AIRCRAFT IS FULL CAT III CAPABLE.

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