The FAA has issued TSO approval and approved model list supplemental type certification (AML-STC) for the L-3 Aviation Products ESI-500 standby instrument system. The AML-STC is for Class I, II and III Part 23 airplanes and Part 27 helicopters.

The ESI-500 provides altitude, attitude, airspeed, aircraft track, vertical speed, airspeed awareness cues and slip/skid information as well as synthetic vision, obstacles, terrain alerting and navigation. An internal lithium-ion battery provides back-up power to the ESI-500 in case of aircraft power failure. The ESI-500 is also compatible with existing nav and GPS receivers, and it can be configured with an airspeed awareness band highlighting Vne and Vmo cues for the particular aircraft in which it is installed.