- Settore: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
A type of hydraulic system-pressure control valve. When the system pressure is low, as it is when some unit is being actuated, the output of the constant-delivery pump is directed into the system. When the actuation is completed and the pressure builds up to a specified kick-out pressure, the pressure regulator shifts. A check valve seals the system off and the pressure is maintained by the accumulator. The pump is unloaded and its output is directed back into the reservoir with very little opposition. The pump output pressure drops, but the volume of flow remains the same. When the system pressure drops to the specified kick-in pressure, the regulator again shifts and directs fluid into the system.
Spool-type and balanced-pressure-type system pressure regulators are completely automatic in their operation and require no attention on the part of the flight crew. A system pressure regulator is also called an unloading valve.
Industry:Aviation
A type of hydropneumatic (oil-air) shock absorber used on aircraft landing gear. The shock of the landing impact is absorbed by oil flowing through a metering orifice (restricting hole). The smaller shocks from taxiing are taken up by a cushion of compressed air.
Industry:Aviation
A type of ice that forms on the throttle valve of an aircraft carburetor when the throttle is partially closed. The temperature drop caused by the pressure drop across the partially closed throttle valve, and by the evaporation of the fuel, forces moisture to condense out of the air and freeze on the throttle-valve plate.
Industry:Aviation
A type of ice which forms on an aircraft flying through visible moisture (as in a cloud) when the air temperature is below freezing. Rime ice is made of ice crystals and is rough and milky looking. Rime ice not only adds weight to the aircraft, but since it is rough, it disturbs the airflow over the wing and tail surfaces and destroys lift.
Industry:Aviation
A type of igniter used in a gas turbine engine ignition system. The center electrode is set back into the insulator so the spark jumps out past the end of the igniter. Constrained-gap igniters do not protrude into the combustion liner, so they run cooler than annular-gap igniters.
Industry:Aviation
A type of ignition cable used to carry high voltage from the magneto distributor to the spark plug. Shielded ignition cable is used in aircraft installations where the electromagnetic radiation from the high-voltage spark plug leads could cause radio interference.
The spark plug leads are enclosed in a metal braid. One end of the braid is connected to a terminal in a shielded spark plug, and the other end is connected to the magneto distributor. Any radio-frequency energy that radiates from the wire when the spark is jumping the gap in the spark plug is picked up by the braid and carried to ground, rather than radiating into space and causing radio interference.
Industry:Aviation
A type of ignition system used on reciprocating engines of aircraft that fly at high altitude.
The low air pressure at high altitude allows the high voltage inside an unpressurized distributor to jump to the wrong electrode. To prevent this, the distributor can be pressurized with compressed air from the engine supercharger. This higher-density air is a good enough insulator to prevent the high voltage from jumping to the wrong electrode.
Industry:Aviation
A type of indicator light used in an aircraft. The bulb may be tested by pressing on the top of the light fixture to complete a circuit to ground. If the bulb is good, the light will illuminate.
Industry:Aviation
A type of inductor wound around a core of laminated iron sections. Iron has a much higher permeability than air, and an iron-core coil has a greater inductance than an equivalent size air-core coil.
Industry:Aviation
A type of industrial dye used to measure the amount of contact between mating parts. One of the surfaces to be mated is given a light coat of Prussian blue dye, and the parts are assembled. During the assembly, one part is moved slightly with respect to the other. The parts are then disassembled, and the amount of dye transferred from one part to the other gives an indication of the amount of physical contact between the two parts.
Industry:Aviation
