An in-flight investigation of the effect of pure time delays on low LID space-shuttle-type landing tasks was undertaken. The results indicate that the sensitivity of the pilot ratings to changes in pure time delay in pitch is strongly affected by the task and only slightly affected by changes in control system augmentation mode. Low LID spot landings from a lateral offset were twice as sensitive to pure time delay as normal low LID landings. For comparison purposes, formation flying was also investigated and was found to be less sensitive to time delay than the landing tasks. AGL ASL c CAS C* DFBW g I Jy KIAS I' M ** PIO PR s SAS 7 A Nomenclature = above ground level = above sea level = mean aerodynamic chord = command augmentation system = N z -(V co /57.3g)q -L/qs -dC L /da = dC L /3d e -M/qsĉ dC m /(dqc/2V) = dC^/(dac/2V) = dC m /dd e= digital fly-by-wire = acceleration due to gravity = 32.2 ft/s 2 = prefix for improved system = pitch inertia, ft-lb-s 2 = indicated airspeed, knots = pitch rate feedback gain = lift force, Ib = pitching moment, ft-lb = normal acceleration, g = pilot-induced oscillation = pilot rating = pitch rate, deg/s or rad/s = dynamic pressure, lb/ft 2 = Laplace transform variable = stability augmentation system = time delay, s = true airspeed, ft/s = crossover velocity = 324 ft/s = angle of attack, rad = angle of attack rate, rad/s = flight-path angle, deg = increment

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