Load of the Reaction ZPL-20 Cannon 20 mm on L-159 ALCA Airplane Stability
Jan Tvarožek, Miroslav Janošek

Abstract
The paper deals with the flow over the L-159 ALCA aircraft airfoils in subsonic regime. Authors have analyzed and assessed the effects of external loads on the aircraft structure during fire. In addition, the impact of the airborne cannon fire on the aircraft stability has been examined. Next, the results of calculations have been analyzed and changes in armament have been proposed. In proposing changes, safe use of cannon in combat has been considered. Moreover, changes also pertained to the aircraft tactical employment mainly at low speeds.

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