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252 - ATPL Question Bank in English - The Mach-trim function is intended to reduce adverse pitch-stability effects associated with:

Question 252 - Principles of Flight - ATPL - Airline Transport Pilot Licence

Uncontrolled changes in stabilizer setting
Increased drag due to shock wave formation
Compressibility effects on the stabilizer
Mach-dependent nose-down pitching tendencies, such as Mach tuck associated with rearward centre-of-pressure movement.

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