# SDR 9JLA2021111731071

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 11, 2021
- Submitted: November 17, 2021
- Operation: Air carrier
- Aircraft: [N851GK](https://openairdocs.org/aircraft/N851GK), registered now
- Make and model: Bombdr CL6002D15
- Aircraft serial: 5643
- Aircraft time: 5,674 hours, 4,055 cycles
- System (JASC): [2200 · Auto Flight System](https://openairdocs.org/jasc/2200)
- Part: Autopilot Sys
- Part number: 8220182001
- Part serial: 182
- Condition: Failed
- Stage of operation: IN
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9JLA2021111731071

## Discrepancy

THE FLIGHT CREW REPORTED THAT DURING AIRCRAFT POWERUP THE NO2 YAW DAMPENER DISPLAYED INOPERATIVE. THE MAINTENANCE VENDOR TROUBLESHOT AND DETERMINED THE AUTO-PILOT CONTROLLER WAS DEFECTIVE AND WAS REPLACED WITH AN OVERHAULED CONTROLLER. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.

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