At the other end of the standby spectrum are new, miniature PFDs. The advantage is that the law of primacy and practice with glass cockpits will prepare you to fly using this small version of a standard PFD indicator-you don't have to transition mentally to steam gauge displays at the same time you're recovering from a PFD failure. L-3 Communications' ESI-1000 Trilogy "provides dependable backup for attitude, altitude, airspeed, slip/skid and optional heading information," according to its Web site-redundancy in a form a glass cockpit pilot is most ready to use.
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