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250 Lateral deviation acceleration per unit accelerometer aircraft attitude aircraft frequency bandwidth aircraft heading aircraft response aircraft to follow altitude attitude-director indicator bank angle capability command needle control augmentation system CONTROL COMMAND control input control position control system controlled degrees cross winds damping ratio deceleration limits degree of freedom dropout flight path flight-director commands flight-director logic ft/sec glide path ground speed heading-hold mode height-control High pass filtering horizontal hovering trials instrument flight instrument hover Langley Research Center limit cycle m/sec maximum deceleration rate moving-map display onboard the aircraft pedal PERFORMING DECELERATING APPROACHES pilot reluctance pilot workload pitch and roll Pitch control rad/sec2 radar altimeter radians radians/second range rate Range-rate error rate error research helicopter response characteristics resulted Roll control roll model situation displays stabilization stable when negative tail winds test helicopter trim changes turn-following mode U.S. Customary Units velocity profile vertical needle wind shears yaw degree