Discussion
Statement I: Minimum control speed on the ground is established without using nosewheel steering.
Statement II: The runway may be contaminated.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the reason for the first. \( V_{MCG} \) is established using aerodynamic controls alone, without nosewheel steering, because the runway may be wet, icy or otherwise contaminated and the nosewheel's cornering force cannot be relied upon.
Certifying to the pessimistic case means the published speed remains valid on the day it is most needed. The same conservatism appears elsewhere in the definition - the critical engine is assumed to fail, the remaining engines are at take-off power, and a limited lateral deviation from the centreline is permitted.
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