... fluid pressure is received and return fluid is discharged are marked A and B, respectively. The motor has a cylinder block -and- piston assembly in which the bores and pistons are in axial arrangement, ... what three Army aircraft? ___ A. UH-1H, AH-1S, and OV-1B. ___ B. UH-1D, AH-1H, and OV-1. ___ C. OV-1A, AH-1G, and UH-1E. ___ D. OV-1, AH-1G, and UH-1C. 4. What type of pump is often used ... Double-action hand pump. The double-action hand pump has two check valves which allow fluid to be drawn into the left and right chambers. (Page 6) 10. D. Inlet check valve. Moving the handle...