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383 - ATPL Question Bank in English - Which of the following statements about a Mach trimmer is correct?

Question 383 - Principles of Flight - ATPL - Airline Transport Pilot Licence

A straight wing aeroplane always needs a Mach trimmer for flying at Mach numbers close to MMO
A Mach-trim function can compensate undesirable Mach-dependent pitch-trim and stick-force stability changes in a swept-wing aeroplane.
The Mach trimmer corrects the natural tendency of a swept wing aeroplane to pitch-up
A Mach trimmer reduces the stick force stability of a straight wing aeroplane to zero at high Mach numbers

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