Discussion
Assertion (A): Nosewheel steering may be used in establishing the ground minimum control speed.
Reason (R): The rudder is the only directional control available on a contaminated runway.
Select the correct answer from the options below.
Answer: D
Correct answer: A is false but R is true
The reason is sound and it is exactly why the assertion fails. On a contaminated runway the nosewheel may have little cornering force, leaving the rudder as the only directional control that can be depended on.
\( V_{MCG} \) is therefore established using aerodynamic controls alone, deliberately excluding nosewheel steering, so that the published speed remains valid in the conditions where it matters most. The assertion states the opposite of the certification requirement. This is the pattern where a true reason contradicts rather than supports the assertion, so each must be assessed on its own before they are compared.
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