noun
aileron
Technical term for the hinged flight control surface on an aircraft wing, used to control roll.
パイロットは補助翼を操作して機体を傾けた。
The pilot operated the ailerons to bank the aircraft.
昇降舵 is the elevator, which controls pitch, while 補助翼 controls roll.
Compound of 補助 (assistance) and 翼 (wing), referring to a secondary wing surface that assists in controlling the aircraft.