An aircraft structural element having a cavity. The structural element has an opening in a wall of the cavity through which moisture located in the cavity can escape into the surroundings, wherein a drainage element for sealing the opening in the wall of the cavity is provided in the opening. In order...http://www.google.com/patents/US7677500?utm_source=gb-gplus-sharePatent US7677500 - Aircraft structural element provided with a cavity and drainage element
