What should a pilot do to maintain level flight when airspeed is decreased during a turn?

To maintain level flight during a turn when airspeed decreases, it is essential to adjust the aircraft's pitch to manage the angle of attack while considering the bank angle. As airspeed decreases, the lift generated by the wings also decreases, which can lead to a loss of altitude if not managed correctly.

By decreasing the angle of bank, the pilot reduces the load factor on the wings, which can help maintain the lift needed for level flight at lower airspeeds. Simultaneously, increasing the angle of attack (within the aircraft's safe limits) can help restore sufficient lift to counteract the decrease due to the reduced airspeed. This combined approach allows the pilot to stabilize the aircraft's altitude while managing the effects of both speed and bank angle on lift.

Therefore, adjusting the angle of bank downwards and increasing the angle of attack simultaneously is the most effective strategy for maintaining level flight in this scenario.