- 업종: 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 privately owned radio station located on an airport. Pilots of aircraft operating from the airport can talk with the operator of the UNICOM station to order service or to have the operator ready to service their aircraft when they land. UNICOM can be used to give advisory information about the airport, but it cannot be used to control traffic around the airport.
Industry:Aviation
A problem in oxy-gas welding in which the flame burns back into the mixing chamber of the torch. A clogged or overheated tip can cause the flame to disappear from the tip and burn back into the mixing chamber.
A flashback is always accompanied by a shrill hissing or squealing, and the flame does not reappear at the tip as it does with a backfire. Flashback is extremely dangerous, and if the fuel gas, the acetylene or hydrogen, is not turned off at the regulator, the fire can burn back through the hose and cause an explosion.
Industry:Aviation
A problem that occurs when solder flows up around the individual wires in a stranded electrical conductor until it reaches the insulation. When stranded wire is soldered, there should be a short piece of the bare wire between the end of the solder and the beginning of the insulation. This bare section allows the wire to flex smoothly so it will not break when it is vibrated.
Industry:Aviation
A procedure in servicing vapor-cycle cooling systems in which a vacuum pump is used to remove all of the air from the system. Evacuation removes all traces of water vapor that could condense out, freeze, and block the system.
Industry:Aviation
A procedure used in aircraft maintenance in which the operation of a malfunctioning system is analyzed to find the reason for the malfunction and to find a method for returning the system to its condition of normal operation.
Industry:Aviation
A procedure used with nickel-cadmium batteries to bring all the cells to exactly the same state of charge. The battery is completely discharged and all the cells are shorted and allowed to stand for several hours with the shorting straps in place. Then the battery is given a constant-current charge to restore 140% of its ampere-hour capacity.
Industry:Aviation
A process by which certain types of metal are hardened or softened by heat. Most metals containing iron can be hardened by heating them to a high temperature and quenching them in water, brine (a solution of salt and water), or oil. These same metals can be softened by heating them to a high temperature and allowing them to cool slowly in an oven.
Copper cannot be hardened with heat. When copper is heated red-hot and quenched in water, it becomes soft. Metals that cannot be hardened with heat can be work hardened by bending, hammering, rolling, or stretching. However, most of these metals can be softened by heating them and cooling them slowly.
Industry:Aviation
A process by which components of a liquid mixture are separated. Crude oil, for example, is a source of many hydrocarbon fuels and lubricants which are obtained by the process of distillation.
The crude oil is heated to a specific temperature and some vapors are driven off, and these vapors are cooled until they condense into a liquid. The temperature of the oil is increased and more vapors are driven off and condensed.
Butane, gasoline, kerosine, diesel fuel, furnace oil, lubricating oil, and tar all have different boiling points and are all produced by distilling crude oil.
Industry:Aviation
A process in an electrical circuit or control system in which some energy from the output of the system or circuit is fed back into the input. If the energy being fed back is in phase with the input signal, the feedback is positive and the output is increased. But if it is fed back out of phase with the input signal, the feedback is negative and the output is decreased.
A control system using feedback is called a closed-loop system. The feedback closes the loop.
Industry:Aviation
A process in the heat treatment of metal. The metal is heated to a specified temperature and then removed from the furnace and submerged in oil, brine, or water. The effect of quenching is different for different types of metal. Steel is hardened by quenching, and copper is softened by quenching.
Industry:Aviation
