# SDR QR9R2025060600002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 6, 2025
- Submitted: June 6, 2025
- Operation: General aviation
- Filed by: [M1 Support Services, repair station QR9R369D](https://openairdocs.org/faa-repair-station/QR9R369D/m1-support-services.md) (OpenAirDocs)
- Make and model: Bolkms BK117C2
- Aircraft serial: 9769
- Aircraft time: 4,506 hours
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Ahrs
- Part number: 42000332460
- Part serial: 5441
- Condition: Failed
- Location: Zone 200
- Stage of operation: HO
- How discovered: O
- Nature of condition: F
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QR9R2025060600002

## Discrepancy

AT IDLE DURING HOVER TAXI, COPILOTS ATTITUDE INDICATOR LEANED, ATT DISPLAYED ON PFD BOTH SIDES. AHRS DISC APPEARED ON CAD. PILOT SWITCHED AHRS SWITCH TO POSITION 1 AND BOTH PFDS FAILED; SWITCHED TO AHRS 2 AND BOTH PFDS WORKED. REMOVED AND REPLACED #1 AHRS IAW AMM 34-22-00, 4-1. FUNCTIONAL TEST COMPLETED OK IAW AMM 34-22-00, 5-1.

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