True Altitude. True Safety. Radar Altimeters FreeFlight Systems' certified radar altimeters work consistently in the harshest environments including rotorcraft low altitude hover and terrain transitions. RA-4000 RA-4500 * TSO-certified and STC approved * Integrates with compatible glass cockpit displays to display DH and Height above altitude * RS-232 capable * NVG display available * NVG display available * TSO-certified and STC approved * ARINC 429 capable dallasavionics.com 800-527-2581/214-320-9770 ISO 9001:2015 / AS9100 Rev Dhttp://www.dallasavionics.com