A Simulation evaluation of a four-engine jet transport using engine thrust modulation for flightpath control
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altitude Angle of attack approach and landing approach condition augmentation control laws Augmented mode 145 automatic landing system Automatic mode B-720 aircraft B-720 transport bank angle command cockpit configuration control modes control system failure Cooper-Harper pilot ratings cruise flight Deficiencies requiring improvement deg/sec Differential throttle dihedral Downrange dutch roll flaps O Manual flight control system flightpath angle command Flying Qualities four-engine ft/sec glide slope ground effect improvement Deficiencies requiring inboard and outboard inboard Right outboard jet transport landing flight condition lateral-directional Left outboard level of turbulence light turbulence manual and augmented manual throttle control mode 145 knots Moderate Light Moderate moderate turbulence level NASA nondimensional outboard engines Pilot 2 Pilot piloting technique Pitch rate PR rating qualities evaluation rate of sink requiring improvement Deficiencies retrim runway shown in Fig sideslip simulation evaluation sink rate step response task throttle augmentation mode throttle modulation throttle-only control throttle-only flightpath control trim turbojet