L-3 Avionics’s Trilogy electronic standby instrument received TSO approval from the FAA for use on Part 27 and Part 29 rotary-wing aircraft, according to the Grand Rapids, Mich.-based company.
The L-3 Trilogy, apparently so named because it makes the holy trinity of attitude, altitude and airspeed available to pilots when all else fails, is on display at L-3’s Heli-Expo booth (No .4829). The Trilogy offers an option to provide heading data using an external flux valve (magnetometer). The panel-mounted Trilogy integrates an air data computer and solid-state attitude sensor with circuitry to process and display the external heading input. The rotorcraft version of the indicator is calibrated from 20 to 350 knots and -1,500 to 55,000 feet and can handle roll rates up to 100 degrees per second. It will be available as original equipment on new helicopters as well as for retrofit.
