- 行业: 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 form of nonprotective finish used on wood to color the wood without hiding the grain. After a piece of wood is stained, it is usually covered with varnish to protect it.
Industry:Aviation
A form of one-way seal used on the piston in some fluid-power actuators. Chevron seals are made of a resilient material in the shape of the letter V, a chevron. The pressure being sealed with a chevron seal must be applied to the open side of the V.
Industry:Aviation
A form of operational test of a system or component in which unusual conditions are used to cause a premature failure.
An accelerated-life test is used to locate weak points and predict the service life the system or component will likely have under normal operating conditions. The test conditions used in an accelerated-life test are much more severe than will ever be encountered in normal operation.
Industry:Aviation
A form of oscillator that produces a square-wave output. It uses two transistors arranged in a circuit in such a way that when one transistor begins to conduct (when it turns on), it turns the other transistor off. When the second transistor turns off, it feeds a signal to the first transistor that turns it off. When the first transistor turns off, it turns the second one on.
A free-running multivibrator has no stable condition, and because of this, it is called an astable (no stable condition) oscillator.
Industry:Aviation
A form of paper tape which is crinkled, with one side coated with a pressure-sensitive adhesive. Crepe masking tape is used to prepare a surface for painting. The crinkles allow the tape to lie flat when it is used to mask a curved line.
Industry:Aviation
A form of plastic molding in which a hollow tube of thermoplastic material is heated inside a mold.
Air pressure is applied to the inside of the tube, and the soft plastic material is forced out against the walls of the mold. The outside of the part takes the form of the inside of the mold. The mold is then opened and the molded part removed.
Industry:Aviation
A form of powdered glue made from milk. Casein glue powder is mixed with cold water to form a creamy paste.
Casein glue was formerly used for joining wood parts of aircraft, but it is no longer used because better types of glue are now available.
Industry:Aviation
A form of power brake which uses hydraulic system pressure to help the pilot apply force to the brake master cylinder. When the brake pedal is depressed, hydraulic system pressure acts on the piston in the brake master cylinder to apply the brakes.
Boosted brakes and power brakes are not the same. Power brake systems use hydraulic system pressure in the brake wheel cylinders themselves.
Industry:Aviation
A form of power saw used to cut wood, plastics, or metal. The band saw blade is a narrow strip of steel with teeth along one edge. The ends of the blade are welded together to form a continuous loop, and the loop passes over two large wheels, one above and the other below the saw table.
One of the wheels is driven by an electric motor, and its speed is controllable to allow the operator to match the speed of the blade to the type and thickness of material being cut.
For cutting the inside of a hole, many band saws have an attachment that allows the saw blade to be cut in two and an end put through a hole in the work. The ends are then welded back together and the weld ground smooth.
Industry:Aviation
A form of precipitation which comes from cumulo nimbus clouds. Hail forms when drops of water are carried by up-currents of air inside the cloud to a level where the temperature is low enough that the water freezes into pellets of ice.
Near the top of the cloud, the ice pellets are thrown from the up-current and fall into the warmer air below. They pick up more water and are again carried upward. Each trip up and down allows the ice pellets, called a hailstones, to gain another layer of ice. This process continues until the hail is too heavy to stay in the cloud. Some hailstones grow large enough to cause severe damage to people, property, or animals on the ground.
Industry:Aviation
