Abstract: A locking device made of two interfitting parts that holds the throttle control levers of an aircraft in their closed position when the parts are interfit. A key activated locking mechanism holds the two parts together. The throttle control levers are sandwiched between an upper transverse bar and the locking mechanism that secures the two parts to one another. An inclined surface formed mid-length of the upper transverse bar is inclined at the same angle as the throttle control levers when in their throttle closed position to confine the levers to the smallest possible space. A hemispherical-in-configuration cutaway is formed in the lower transverse bar and accommodates the yoke of the aircraft and restricts its movement.