Discussion
Assertion (A): The landing constraint is drawn as a vertical line.
Reason (R): Landing distance depends on approach speed and braking but not on installed thrust.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason explains the assertion. Landing distance depends on the approach speed and on the deceleration from brakes, spoilers and reverse thrust; the engines are at idle through the flare and touchdown, so installed thrust plays essentially no part.
Being independent of the vertical axis, the requirement 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 so is drawn as a vertical line with the feasible region to its left.
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