- 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 hexagonal rod used to turn an Allen screw. The most common Allen wrenches are bent with a 90° angle so they have a short and a long leg.
Industry:Aviation
A high grade of steel produced by melting scraps of iron and steel in a graphite crucible and adding the correct amounts of alloying elements and fluxes.
The metal is boiled to remove the volatile oxides, and after the slag is removed, the molten steel is cast into ingots.
Industry:Aviation
A high-grade, translucent ceramic material having a hard, glazed finish. Porcelain is used for dishes, vases, and high-strength electrical insulators. It was used as the insulator in some early aircraft spark plugs.
Industry:Aviation
A high-impedance semiconductor device in which the flow of load current between the source and drain is controlled by variations in voltage on the gate, rather than current, as is done with a bipolar transistor.
Load current flowing between the source and the drain, through a semiconductor channel, is switched and regulated by the effect of an electric field exerted by the voltage on the gate. An FET is sometimes called a unipolar transistor.
Industry:Aviation
A high-impedance semiconductor device that controls the flow of electrons between its source and drain by a voltage placed on its gate. The function of a JFET is similar to that of a bipolar transistor, except the control is a small change in voltage rather than a small change in current.
Industry:Aviation
A high-intensity spotlight mounted on an aircraft and aimed in such a direction that it shines on the runway when the aircraft is on the final approach for landing.
Industry:Aviation
A high-level computer language whose command signals are similar to English commands. The acronym COBOL is taken from COmmon Business Oriented Language.
Industry:Aviation
A highly accurate radio-frequency signal broadcast from the National Bureau of Standards radio station, station WWV. The standard-frequency signal is broadcast on frequencies of 2.5, 5.0, 10.0, 15.0, 20.0, and 25.0 megahertz.
Industry:Aviation
A highly directional antenna used for high-frequency (HF) radio communications. A yagi antenna has a single dipole connected to the transmission line (this is the driven dipole) and several unconnected dipoles parallel to the driven dipole. These unconnected dipoles act as reflectors and directors for the radio-frequency energy transmitted from the antenna.
Industry:Aviation
A highly directional radio signal transmitted vertically upward from a transmitter located along a navigational radio range. The output of the fan marker is heard only when the aircraft is directly above the transmitter, and this allows the pilot to know his exact location.
Industry:Aviation
