Abstract: A refill device for a diesel exhaust fluid tank is provided which employs a nozzle connection to the fluid tank to provide replenishment of the exhaust fluid from a reservoir. Fluid from the reservoir is communicated to the fluid tank using a pump providing a pressurized fluid supply through a first hose. A second hose engaged with the nozzle vents air from the fluid tank for the duration of filling by the first hose.

Abstract: In a helicopter, a pilot-actuated lever controls, through linkage mechanisms, a servo valve to drive a hydraulic piston; the piston moves a swash plate which in turn controls movement of rotor blade pitch positioning mechanisms against the force of blade loading, caused by aerodynamic forces. Blade loading, heretofore monitored visually by the pilot on a cruise guide indicator instrument, is used herein to control a secondary input to the servo valve, thereby to alter the position linkage mechanism which causes the force of a spring attached thereto to impose a force on the collective pitch control for blade loadings in excess of one-third of maximum allowable blade loads, in a direction tending to drive the control to lower collective pitch (lower blade loading). This provides "feel" to the pilot in proportion to blade loading when at critical magnitudes.