SDR QR9R2025060600002

Service difficulty report · Ahrs · Bolkms BK117C2

Difficulty date: June 6, 2025
Submitted: June 6, 2025
Operation: General aviation
Filed by: QR9R369D
M1 Support Services
Make and model: Bolkms BK117C2
Aircraft serial: 9769
Aircraft time: 4,506 hours
System (JASC): 3460 · Flight Management Computing Hardware System
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

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

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.