Discussion
Indicated airspeed is used by a pilot during
Answer: A
Indicated airspeed is used during take-off.
Indicated airspeed reflects the dynamic pressure on the aircraft, which is what sets the aerodynamic forces. So the speeds that matter for take-off, such as the rotation and lift-off speeds and the stall speed, are given in indicated airspeed and stay the same whatever the airfield's altitude or temperature.
Navigation needs true airspeed and ground speed, not indicated airspeed. Engine RPM is set from engine instruments, and the elevator angle is a control input, not something read from an airspeed.
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