Discussion
Statement I: The landing constraint plots as a vertical line on a constraint diagram.
Statement II: Landing performance depends on approach speed and braking rather than on installed thrust.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. Landing performance depends on the approach speed and the deceleration available from brakes, spoilers and reverse thrust; the engines are at idle throughout the flare and touchdown, so installed thrust plays essentially no part.
Since the requirement is therefore independent of the vertical axis, it translates purely into a maximum wing loading - through the maximum approach speed, hence stalling speed, hence \( W/S \) at the landing \( C_{L,max} \) - and plots as a vertical line with the feasible region to its left.
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