Both have built-in, internal Global Positioning System (GPS) capabilities. Systems with the Class B designation offer many of same features as Class A systems. It even helps prevent tail strikes during a landing by using inputs from the aircraft’s attitude heading reference system (AHRS). It also provides a high-resolution terrain database for both on- and off-airport/heliport operation, and gives callouts during an autorotation. With Class A performance, the EGPWS offers look-ahead alerts, altitude callouts, and terrain display. Sikorsky Aircraft plans to offer a Class A EGPWS as a factory option on its S-76. The Mark XXI, targeted at the light helicopter market, is a Class B TAWS, while the Mark XXII offers Class A performance, potentially for the larger transport and corporate rotorcraft. Honeywell offers two helicopter EGPWSs, the Mark XXI and Mark XXII. Their FAA certification was expected in October. The latest Honeywell systems entered flight test in the spring, in Bell 206 and MD900 helicopters.
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