Discussion
A Mach trim system limits the aeroplane's maximum speed. Is this correct?
Answer: C
Correct answer: No, it applies compensating trim as Mach number rises
A Mach trim system senses Mach number and applies compensating nose-up trim, so that the stick force continues to build conventionally with speed instead of reversing.
It is a handling device, not a limiter: it does not restrict thrust and does not prevent the limiting Mach number being exceeded, which remains the pilot's responsibility supported by overspeed warnings. Nor is it without effect on trim - adjusting the trim is precisely what it does.
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