# SDR CALA2026102920643

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 29, 2026
- Submitted: October 29, 2026
- Operation: Air carrier
- Aircraft: [N68891](https://openairdocs.org/aircraft/N68891), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 42196
- Aircraft time: 34,281 hours, 12,765 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [2200 · Auto Flight System](https://openairdocs.org/jasc/2200)
- Part: Smyd
- Part number: 285A1010112
- Part serial: F17659
- Condition: Faulted
- Location: Nr 1
- Part time: 14,093 hours, 4,852 cycles
- Stage of operation: CL
- 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/CALA2026102920643

## Discrepancy

YAW DAMPER DISENGAGED AUTOMATICALLY, YAW DAMPER LIGHT CAME ON AFTER TAKEOFF,  THE YAW DAMPER LIGHT ILLUMINATED AND SPD LIM ON CA PFD SPEED TAPE. PERFORMED SMYD TEST, NR 1 HAD FAULT 27-31013. PERFORMED ADIRU BITE TEST, TESTED GOOD.  SMYD TEST #2 TEST GOOD.  SWAPPED ADIRU 1 & 2. TEST ON SMYD NR 1 SAME RESULTS.  RESWAPPED ADIRUS TO ORIGINAL POSITION.  NEEDS NEW SMYD NR 1 IAW FIM 27-32 TASK 817.    REMOVED AND REPLACED SMYD NR 1 IAW AMM 27-32-42. BITE TESTED GOOD.

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