« Previous Next »

T-45 Motor Drive Card

Technical Information

Catalogue No: C0629
Category: Flight Control
Object Type: Module/Sub-Assembly/Component
Object Name: T-45 Motor Drive Card
Part No: 7501-00105
Serial No: 00026
Manufacturer: GEC Avionics
Division: Flight Controls [FCD]
Platform(s): T-45 Goshawk
Year of Manufacture: circa 1989
Dimensions: Width (mm): 170
Height (mm): 95
Depth (mm): 24
Weight (g): 163
Location: Rack RAA03 [Main Store]

Type No. 7501-00105
Ser. No. 00026
K0656 A2A2
GEC Avionics Limited


A yaw damper is a device used on many aircraft (usually jets and turboprops) to damp (reduce) the rolling and yawing oscillations known as the Dutch roll mode. It consists of yaw-rate sensors and a processor that provides a signal to an actuator connected to the rudder. The use of a yaw damper helps provide a better ride by preventing the uncomfortable yawing and rolling oscillation. On some aircraft it is mandatory for the yaw damper to be operational at all times during flight above a specified altitude.
The T-45 is fitted with a yaw-damping system which takes effect, below 250kts, for stability on the approach through the "burble" (caused by superstructure vortices) over the round-down. This card is a module of the computer for yaw damping and it drives the actuator motor.

The module is also marked MRB/230/4311 (MRB stands for Material Review Board)

Click to enlarge
Related Items: