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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Principles of Flight > For a control system in which the pilot mechanically commands only a servo tab and airflow moves the freely hinged primary surface, with no control lock engaged, what is true during taxiing at low airspeed?

92 - ATPL Question Bank in English - For a control system in which the pilot mechanically commands only a servo tab and airflow moves the freely hinged primary surface, with no control lock engaged, what is true during taxiing at low airspeed?

Question 92 - Principles of Flight - ATPL - Airline Transport Pilot Licence

The primary surface angle is not fixed uniquely by the control-wheel position; it also depends on wind and aerodynamic loads.

The primary surface is held mechanically at the exact angle commanded by the control wheel, regardless of airflow.

The primary surface is always held exactly neutral by the servo tab, even in a tailwind.

The primary surface must remain at full deflection whenever the aeroplane is moving.

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