Abstract: A failsafe pilot selector valve may include at least one inlet port, a first outlet port, a second outlet port, and a biasing element. The failsafe pilot selector valve may have a first end position with the at least one inlet port in fluid communication with the first outlet port, a second end position with the at least one inlet port in fluid communication with the first outlet port, and an intermediate position between the first end position and the second end position with the at least one inlet port in fluid communication with the second outlet port. The biasing element may provide a biasing force to move the failsafe pilot selector valve to the first end position. The pilot selector valve can alternately provide pilot fluid to primary and redundant control elements of a redundantly controlled system in fluid communication with the outlet ports.

Abstract: A failsafe pilot selector valve may include at least one inlet port, a first outlet port, a second outlet port, and a biasing element. The failsafe pilot selector valve may have a first end position with the at least one inlet port in fluid communication with the first outlet port, a second end position with the at least one inlet port in fluid communication with the first outlet port, and an intermediate position between the first end position and the second end position with the at least one inlet port in fluid communication with the second outlet port. The biasing element may provide a biasing force to move the failsafe pilot selector valve to the first end position. The pilot selector valve can alternately provide pilot fluid to primary and redundant control elements of a redundantly controlled system in fluid communication with the outlet ports.

Abstract: An electrical machine such as an alternator (10) has a first fan (12) and second fan (14) rotatably disposed within a first housing portion (16) and a second housing portion (18). The fans (12, 14) each comprise a continuous ring (54), a plurality of blades (56), and a plurality of tabs (58). The continuous ring (54) is disposed in a top plane and connects the plurality of blades (56) extending therefrom. The plurality of tabs (58) extends from the plurality of blades (56) into a bottom plane so as to be parallel to the continuous ring (54) disposed in the top plane.