crowdgift.blogg.se

#Convert air navigation notation plus

The fluid must be able to readily absorb and release heat. Thermal Capacity/Conductivity. Hydraulic fluid acts as a system coolant.The fluid should have anti-corrosion properties and be thermally stable. Lubricant Properties. The hydraulic fluid acts as a lubricant for the pumps, actuators and motors within the system.The ideal hydraulic fluid will have a very low freezing point and a very high boiling point. The fluid used must flow easily at very low temperatures but must also maintain adequate viscosity at high temperatures. Adequate Viscosity. Aircraft hydraulic systems must work efficiently over a broad temperature spectrum.The auto-ignition temperature of most aviation hydraulic fluids is in the range of 475 degrees C. However, if the fluid is heated to temperatures in excess of 180 degrees C, it will sustain combustion.

These fluids are phosphate esters and, unlike mineral oil based hydraulic fluids, they are very difficult to ignite at room temperature. Special hydraulic fluids with fire resistant properties have been developed for aviation use.

High Flash Point. In the event of a hydraulic leak, fluid ignition should not occur at the normal operating temperatures of the surrounding components.

However, given the operating pressure (3000 to 5000 psi) that most aircraft hydraulic systems generate in combination with the environmental conditions and strict safety criteria under which the system must operate, the hydraulic fluid that is used should have the following properties: Hydraulic Fluidįluid is the medium via which a hydraulic system transmits its energy and, theoretically, practically any fluid could be utilized. Those components are the “pressure generator” or hydraulic pump, the hydraulically powered “motor” which powers the component concerned and the system “plumbing” which contains and channels the fluid throughout the aircraft as required.

Depending upon the aircraft concerned, a single hydraulic system, or two or more hydraulic systems working together, might be used to power any or all of the following components:Ī hydraulic system consists of the hydraulic fluid plus three major mechanical components. In larger and more complex aeroplanes, the use of hydraulically powered components is much more common. In light, general aviation aircraft, this use might be limited to providing pressure to activate the wheel brakes. Virtually all aircraft make use of some hydraulically powered components.

A hydraulic system uses a fluid under pressure to drive machinery or move mechanical components.

#Convert air navigation notation plus