|Object Name:||Helicopter Air Data Probe|
|Year of Manufacture:||1979|
|Location:||Rack RAA10 [Main Store]|
Airspeed and Direction Sensor
Contract No. DAAK 50-77-C-0002
Date of Mfr Mar 79
Ser No. 0008
BHT No. 209-071-305
The Airspeed and Direction Sensor (AADS) forms part of the Helicopter Air Data System (HADS) together with the High Integration Air Data Computer (HIADC). The system outputs accurate air data over the entire flight envelope (forwards, rearwards, sideways and vertical) of a helicopter to a variety of avionics systems.
The AADS is a swivelling probe with pitot and static ports and an integrated air temperature sensor to provide accurate measurement in three axes. The HIADC receives pneumatic and air temperature inputs from the AADS; corrects for systematic errors and computes air data parameters for output on a serial bus.
The AADS is mounted on a boom under the rotor and the pressure head is mounted on gimbals to allow alignment with the local airflow. At high forward speeds it acts like conventional pitot-static probe but at low airspeeds the rotor downwash becomes the dominant factor and the unique characteristics of this swivelling probe provide a solution. The system was fitted to a variety of Helicopters such as the AH-64D, Cobra and EH101.
The unit shown is an early unit dating from March 1979.
The unit shown is Serial No. 0008 and was certainly being advertised in 1995 but probably predates this.