« Previous Next »

VC10 Triple Yaw Damper Indicator

Technical Information

Catalogue No: C0571
Category: Flight Control
Object Type: Indicator/Instrument
Object Name: VC10 Triple Yaw Damper Indicator
Part No: 5434-A-2
Serial No: 039/65
Manufacturer: Elliott Bros (London) Ltd
Division: Unknown
Platform(s): VC10
Year of Manufacture: 1965
Dimensions: Width (mm): 66
Height (mm): 141
Depth (mm): 168
Weight (g): 1,390
Location: Triple Shelf Unit, RH (indicators) [Main Store]

Triple Yaw Damper Ind.
Type No. 5434-A-2
Ref. No. V.A.A.S.202(ET)
Ser. No. 039/65
Rig Use Only.


Yaw dampers are fitted to each section of the rudder, and it is possible to operate them without engaging either of the autopilots. Under autopilot control, the yaw damper on the bottom section of
rudder is controlled by one autopilot, and that on the middle section by the other autopilot, the other two sections in either case being slaved to the master. The third yaw damper is not associated with an autopilot; it is provided mainly as a standby.
The Triple Yaw Damper Indicator comprises three meters each providing the pilot with an indication of surface activity due to its associated damper. A preflight test facility is incorporated in the Indicator Unit.

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.

Modern digital yaw dampers are part of an integrated digital autopilot system. They use accelerometers and rate sensors to determine the aircraft's motion. It then runs the numbers through special algorithms to determine what rudder inputs need to be made in order to damp any Dutch roll and to coordinate a turn. It then provides those rudder commands to a servo or hydraulic system which operates the rudder. The yaw damper is also known as a Stability Augmentation System.

Click to enlarge
Related Items: