|Object Name:||T-45 Motor Drive Card|
|Division:||Flight Controls [FCD]|
|Year of Manufacture:||circa 1989|
|Location:||Rack RAA03 [Main Store]|
Type No. 7501-00105
Ser. No. 00026
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)