A casing for a lifting aid for an aircraft, comprising at least one strake which extends essentially in a protruding manner in the direction of flight in relation to an outer surface of the casing. A layer of refractory metal, or refractory metal alloy, is deposited over the surface of the integrated circuit chip. In another embodiment of the present invention, the multi-purpose cleaning composition includes solvent and comprises from about 1% to about 25% by weight of at least one Group 1 pyrophosphate, from about 1% to about 25% by weight of at least one surfactant, and from about 50% to about 98% by weight of at least one solvent. The method allows a patient with fractured ribs to sleep comfortably without the pain associated with breathing in and out, and without interruption of sleep.