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170 - ATPL - In general transport aeroplanes with power assisted flight controls are fitted with an adjustable stabilizer instead of trim tabs on the elevator. This is because:

Question 170 - Principles of Flight - ATPL - Airline Transport Pilot license

The pilot does not feel the stick forces at all
Effectiveness of trim tabs is insufficient for those aeroplanes
Trim tab deflection increases Mcrit
Mechanical adjustment of trim tabs creates too many problems

Training tests and timed exam simulations ATPL - Airline Transport Pilot license