1971-02-01

Lateral-Directional Handling Qualities for the Executive Jet in the Landing Approach 710374

Lateral-directional handling qualities for executive jet and related medium weight airplanes in the landing approach flight phase were investigated in the USAF/CAL variable stability T-33 airplane. * Emphasis was placed on the effects of crosswinds and turbulence. Simulated IFR ILS approaches and VFR offset and crosswind approaches were made. Specifically, two Dutch roll frequencies, three Dutch roll damping ratios, three roll-to-sideslip ratios, and three roll mode time constants were investigated.
It was found that the ranges of lateral-directional dynamics investigated do not establish a limiting crosswind value; however, they do determine the ease or difficulty with which a crosswind approach can be accomplished. Roll control power requirements were determined from pilot control usage data and an investigation of the effects of limited roll control power. It was found that available roll control power can establish a limiting crosswind component.

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