Single Scale Airspeed These airspeed indicators have unrestrained movements.These instruments are actuated by ram air and ambient atmospheric pressure obtained from the aircraft pitot and static pressure systems. A moveable pointer and a fixed dial indicate airspeed with the zero index at the 12 o?clock position. Temperature compensation is internal and there is no external zero adjustment. Pointer damping is internally adjustable. Note: Designed to meet the requirements of FAA TSO-C2b for a Type I instrument. Dual Scale Airspeed EA5171 Dual Scale Airspeed EA5172 Dual Scale Airspeed EA5173 |