- 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 ...
An area of low atmospheric pressure which has a closed circulation. In the northern hemisphere the circulation is counterclockwise, and in the southern hemisphere it is clockwise.
Because cyclonic circulation and relatively low atmospheric pressure usually coexist, the terms cyclone and low are often used interchangeably. Also, because cyclones are often accompanied by inclement and sometimes destructive weather, they are frequently referred to as storms.
Tropical cyclones are called hurricanes or typhoons, and cyclones that form in the higher latitudes are called barometric depressions.
Industry:Aviation
An area of low barometric pressure, with its attendant system of winds. A low is also called a barometric depression or cyclone.
Industry:Aviation
An area of low pressure, also called a low, or a trough. The term depression is usually applied to a certain stage in the development of a tropical cyclone, but it also applies to migratory lows and troughs and to upper-level lows and troughs that are only weakly developed.
Industry:Aviation
An area on an aircraft drawing, usually in the lower right-hand corner, where a record is made of the number of the revision of the part shown in the drawing.
Industry:Aviation
An area within a piece of metal to which electrons from the anodic area have migrated.
Industry:Aviation
An arrangement of gears in which one or more gears travel around the circumference of another. An example of an epicyclic gear train is the planetary gear arrangement used to reduce the speed of the propeller shaft of a geared aircraft engine.
One system of planetary gears uses a spur-type sun gear mounted rigidly in the nose section of the engine, and a ring gear with internal teeth driven by the crankshaft. The propeller shaft is mounted on a spider having several arms. Each arm of the spider carries a planetary gear that meshes with and rides between the sun gear and the ring gear.
As the planetary gears travel around the sun gear, they turn the spider and the propeller shaft, in the same direction as the crankshaft, but at a slower speed.
Industry:Aviation
An arrangement of gears in which rotary motion of the pinion (a small spur gear) is changed into linear motion of the rack. The rack is a straight piece of metal with teeth cut into one of its sides. The teeth of the pinion mesh with the teeth of the rack, and as the pinion rotates, it moves the rack. The rack and pinion may also be designed in such a way that movement of the rack rotates the pinion.
Industry:Aviation
An arrangement of logic gates in a computer that adds two bits (binary digits) and produces a sum and a carry bit.
Industry:Aviation
An arrangement of ropes and pulleys used to gain a mechanical advantage. Tackle is most frequently spoken of as block and tackle.
Industry:Aviation
An arrangement of struts or other supporting structure that holds the wing of an airplane above the fuselage.
A high-wing monoplane whose wing is held above the fuselage with a cabane is called a parasol monoplane.
Industry:Aviation
