Service difficulty report · Actuator · Bolkms BK117C2

Difficulty date
October 30, 2025
Submitted
October 30, 2025
Operation
General aviation
Filed by
QR9R369D
M1 Support Services
Make and model
Bolkms BK117C2
Aircraft serial
9821
Aircraft time
3,707 hours
Part
Actuator
Part number
41800876400
Part serial
710529
Condition
Warning Light
Location
Yaw
Stage of operation
TO
How discovered
V
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

YAW ACTUATOR CAUTION LIGHT ILLUMINATED AT TAKEOFF AND WOULD NOT EXTINGUISH. A TEST FLIGHT EVAL FOUND DURING TAKEOFF TO A HOVER; YAW FAILURE INDICATION DISPLAYED IN PFD WITH ACTUATOR CAUTION APPEARING IN CAD. RESET SYSTEM AND SAME FAILURE OCCURED ON FOLLOWING TAKEOFF TO HOVER. REMOVED AND REPLACED SEMA ACTUATOR IAW AMM 67-20-00, 4-14.