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Two Alternative Velocity Vector Cues for the AH‐64D: A Comparative Evaluation

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The AH‐64A employs an integrated helmet and display sight subsystem (IHADSS) presenting night vision system imagery and flight symbology to the pilot's right eye. Velocity vector and acceleration cues tell the pilot when the aircraft is accelerating, its speed, and vector. A low range (0–6 kt) cue is used to minimize velocity and drift variation for hovering and low speed flight. A transition range cue (0–60 kt) is used at speeds > 6 kt, where less sensitivity to velocity change is required. The experiment compared the low range cue to an intermediate range (0–20 kt) cue, proposed for the AH‐64D. Ten AH‐64A pilots performed a mission consisting of seven standard maneuver tasks, in the Simulator Training Research Advanced Testhed for Aviation. Each performed the mission under IHADSS conditions using low and intermediate range cues (order counterbalanced). Results showed that drift and airspeed variation was significantly less for the low range cue during a stationary five‐foot hover; airspeed variation was significantly less in the low range cue condition for hover taxiing. The 100 ft hover revealed no differences. For the hovering turn, turn rate and pedal movement were more constant in the low range cue condition, but the aircraft appeared less stable. No significant differences were noticed for landing and takeoff tasks.
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Document Type: Research Article

Affiliations: U.S. Army Research Institute Rotary Wing Aviation Research Unit, Fort Rucker, Alabama

Publication date: 1996-10-01

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