- 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 desired flight path referenced from magnetic north. A true course measured on a navigational chart is referenced to the geographic north pole but a magnetic compass points to the magnetic north pole. The angular difference between a true course and a magnetic course is called variation.
Industry:Aviation
A detail view in an aircraft drawing that shows the inside of a part. A view of the main drawing is cut with a cutting plane, and the sectional view is drawn to show the shape and construction of the piece along this cutting plane.
Industry:Aviation
A detailed view of a part cut from one of the main views of the drawing and revolved to show its cross section.
Industry:Aviation
A device attached to an aircraft control surface to discharge static electricity into the air. Static electricity builds up as air flows across the surface. If it were not discharged, it could build up high enough to cause a spark to jump between the surface and the main structure. Sparks of this type cause radio interference.
Some static dischargers use carbon-impregnated cotton wicks to pick up the static electricity and discharge it off the ends of the cotton fibers. Other dischargers have needle-sharp points from which the static electricity is discharged.
Industry:Aviation
A device attached to the output of a radio transmitter to use when adjusting its output. The artificial antenna, also called a dummy load, has the same impedance as the antenna, but the radio signal put into the artificial antenna is not radiated.
Industry:Aviation
A device attached to the surface of a piece of equipment to measure the amount of strain acting on the surface. A strain gage is a piece of extremely fine wire bonded (glued) to the surface, with the length of the wire parallel to direction of the strain to be measured. When the surface is stressed, it is also strained (deformed), and it either stretches or compresses. Since the strain gage is bonded to the surface, it also stretches or compresses.
The resistance of the strain gage is measured with a precision bridge-type instrument, and the resistance change caused by the wire stretching or compressing is measured. Strain gages are calibrated so the change in resistance indicates the amount of strain acting on the surface.
Industry:Aviation
A device consisting of a group of meteorological instruments and a radio transmitter carried to a high altitude by a weather balloon. The instruments in the radiosonde measure the air pressure, temperature, and humidity and transmit this information to weather stations on the ground.
Industry:Aviation
A device fitted into a hole to reduce the friction present when a shaft rotates in the hole. Plain bearings are liners for the hole made of a material such as bronze or babbitt metal which have a low coefficient of friction. Antifriction bearings consist of a pair of hardened and polished steel races, with either hardened steel rollers or balls rolling between them.
Industry:Aviation
A device for building experimental electrical circuits that allows the components to be temporarily connected into the circuit, making it easy to exchange components. After a circuit functions as it should on the breadboard, and all the correct components are chosen, the circuit is redesigned into its final configuration.
Many modern circuits are first built on solderless breadboards that allow the substitution of parts without their having to be soldered into the circuit.
Industry:Aviation
A device having a sharp edge of hardened steel that resembles the edge of a knife. Knife-edges are used as fulcrums in many types of precision balancing instruments.
Industry:Aviation
