Private Pilot Private Exam

As altitude increases, the indicated airspeed at which a given airplane stalls in a particular configuration will...

1. Increase considerably.

2. Remain the same regardless of altitude.

3. Decrease due to lower air pressure.

4. Fluctuate with temperature changes.

The correct answer is: Remain the same regardless of altitude.

The indicated airspeed at which an airplane stalls in a given configuration remains the same regardless of altitude. This is because stall speed is primarily determined by the aircraft's weight, wing configuration, and the aerodynamic properties of the airfoil. As altitude increases, the air density decreases, which affects true airspeed. However, the indicated airspeed, which is what pilots reference when flying, is calibrated to reflect variations in pressure and temperature. The aircraft's stall speed in terms of indicated airspeed will not change with altitude, as it is directly tied to the specific characteristics of the airplane and its configuration. While true airspeed may vary with altitude due to changes in air density, pilots will continue to receive the same stall warning at the same indicated airspeed. Thus, it's essential for pilots to understand that stall speed, in terms of indicated airspeed, remains constant despite the altitude.