# SDR CALA2021081801364

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2021
- Submitted: August 18, 2021
- Operation: Air carrier
- Aircraft: [N14731](https://openairdocs.org/aircraft/N14731), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28799
- Aircraft time: 69,785 hours, 24,597 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Warning Message
- Condition: Intermittent
- Location: Autopilot B
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2021081801364

## Discrepancy

AUTOPILOT A WILL NOT ENGAGE AUTOPILOT B ENGAGES BUT KICKS OFF AF TER STICKERS APPLIED NO GROUND TIME. DEFER REVIEWED FAULT HISTORY AND FOUND "AIL PRESS SW-1" FAULT, PERFORM ED LRU REPLACEMENT TEST "ROLL SENS" TEST, TEST PASSED. REF. FIM TASK 22-13 TASK 804. INTERMITTENT FAULT, PERFORMED LAND VERIFY T EST REF. AMM 22-11-00-700-801. TEST PASSED. AIRCRAFT UPGRADED TO FULL CAT CAPABILITY. PLACARDS REMOVED. OK TO CONTINUE.

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