Abstract: An aircraft drain device (14) for interposition between a potable water line (e.g., the drain line from an ice drawer) and a gray water line leading to a drainmast or other external drain. The drain device (14) includes a housing (30), an inlet (36) adapted for connection to the potable water line, an outlet (38) adapted for connection to the gray water line, and a piston (40). The preferably floatable piston (40) is movable between a normal operation position, whereat potable water can flow to the drainmast, and a back-up operation position, whereat the potable water is protected from contact with the gray water. The drain device (14) can be constructed to prevent spillage (or leakage) during back-up operation.

Abstract: A deicing system (10) for preventing ice accumulation on an airfoil surface (14) of an aircraft (12). The system (10) can comprise a control module (66) which controls a valve (64) based on a pressure conditions within the deicer chambers (30), a reservoir (60) for providing pressurized inflation fluid to the deicer chambers (30), and/or a line (62) for providing the deflation suction for the airfoil's low-pressure side (18).