What changes in airplane longitudinal control must be made to maintain altitude while the airspeed is being decreased? Increase the angle of attack to compensate for the decreasing lift.

What changes in airplane longitudinal control must be made to maintain altitude while the airspeed is being decreased? Increase the angle of attack to compensate for the decreasing lift.

• A. Decrease the angle of attack.
• B. Increase the angle of attack to compensate for the decreasing lift.
• C. Increase throttle and maintain angle of attack.
• D. Use more bank angle instead of changing AoA.

Answer: (B)

When flying at a lower speed, lift at the same angle of attack drops because dynamic pressure is lower. To keep the airplane at the same altitude, you must restore lift, which means increasing the angle of attack. This is done by pitching up, raising the nose to hold enough lift at the slower airspeed. As you increase AoA, be mindful of stall risk and keep it within safe limits. Decreasing the angle of attack would reduce lift further, making altitude control worse. Merely increasing throttle and keeping the same angle of attack isn’t about the longitudinal input you’re using to climb or slow—it's an engine control issue, not the pitch change needed to maintain altitude. Using a larger bank angle changes flight path to a turn and increases load factor, which isn’t the direct method to compensate for a decrease in speed while trying to stay level.

When flying at a lower speed, lift at the same angle of attack drops because dynamic pressure is lower. To keep the airplane at the same altitude, you must restore lift, which means increasing the angle of attack. This is done by pitching up, raising the nose to hold enough lift at the slower airspeed. As you increase AoA, be mindful of stall risk and keep it within safe limits.

Decreasing the angle of attack would reduce lift further, making altitude control worse. Merely increasing throttle and keeping the same angle of attack isn’t about the longitudinal input you’re using to climb or slow—it's an engine control issue, not the pitch change needed to maintain altitude. Using a larger bank angle changes flight path to a turn and increases load factor, which isn’t the direct method to compensate for a decrease in speed while trying to stay level.