Discussion
The minimum control speed in the air is
Answer: D
Correct answer: The lowest speed for control after a failure
Minimum control speed in the air, \( V_{MCA} \), is the lowest airspeed at which directional control can be maintained with the critical engine inoperative and the remaining engines at take-off power.
It is fixed by the balance between the asymmetric thrust moment and the rudder's maximum yawing moment. Because rudder moment falls with dynamic pressure while thrust asymmetry does not, there is a speed below which the rudder simply runs out - and that speed is \( V_{MCA} \). It is a control limit, quite separate from the stalling speed, which is a lift limit; certification requires the take-off safety speed to clear both.
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