thrust is managed to maintain ias, and glide slope is being flown. what characteristics should be observed when a headwind shears to be a constant tailwind? a. pitch attitude: increases; required thrust: increased, then reduced; vertical speed: increases; ias: increases, then decreases to approach speed. b. pitch attitude: decreases; required thrust: increased, then reduced; vertical speed: increases; ias: decreases, then increases to approach speed. c. pitch attitude: increases; required thrust: reduced, then increased; vertical speed: decreases; ias: decreases, then increases to approach speed.