Sandel Avionics has received FAA approval for a new reversionary attitude mode for two of its electronic primary navigation displays, allowing aircraft pitch-and-roll symbology to be presented on the nav display in the event of primary attitude indicator failure. The feature is available now for the company’s SN3500 (3ATI) and SN4500 (4ATI) high-resolution, LED backlighted navigation displays. A pilot-activated switch overlays attitude information on the normal nav display’s heading, lateral and vertical guidance symbology in an integrated format. The reversionary mode was demonstrated to the FAA’s satisfaction in the Sandel Cessna Citation S/II flying from McClellan-Palomar Airport near the Sandel plant in Vista, Calif. It is being demonstrated at Heli-Expo at Sandel’s booth (No. 2842).