- 産業: Aviation
- Number of terms: 16387
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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 type of electronic amplifier with two output circuits whose output voltages are equal but 180° out of phase with each other. A push-pull amplifier is also called a balanced amplifier.
Industry:Aviation
A type of electronic filter that passes all frequencies of alternating current below a certain frequency, but blocks or attenuates all higher frequencies.
Industry:Aviation
A type of electronic filter that passes, with little opposition, alternating current above a certain frequency. A high-pass filter blocks direct current, and blocks or reduces the amplitude of all alternating current having a frequency lower than that for which it is designed.
Industry:Aviation
A type of electronic navigation equipment in which the instrument in the cockpit identifies the radial, or line from the VOR station measured in degrees clockwise from magnetic north, along which the aircraft is located. VOR is a phase-comparison system in which two signals transmitted simultaneously from a ground station are in phase only when they are received at a location directly magnetic north of the station. At a location magnetic east of the station, they are 90° out of phase. At magnetic south, they are 180° out of phase, and west of the station, they are 270° out of phase.
The pilot selects on the omni bearing selector (OBS) the radial on which he wants to fly, and the needle of the course deviation indicator (CDI) centers when the aircraft is on the radial. If the aircraft moves off the radial, the needle moves away from center to show the pilot which direction to turn to return the aircraft to the radial. The indictor for the VOR is often also used as the localizer indicator.
Industry:Aviation
A type of electronic navigation system, used by aircraft and ships. The abbreviated name LORAN comes from LOng RAnge Navigation. LORAN is a low-frequency pulse navigation system based on latitude and longitude coordinates.
A master station transmits a pulse of energy that is received by the aircraft and by two or more slave stations. As soon as the slave stations receive the pulse, they transmit a pulse of their own, and these pulses are also received in the aircraft.
The computer in the LORAN receiver measures the difference in time the signals from the master station and from each slave station were received. For every time difference, there is a line, called a line of position (LOP), along which the aircraft is located. The computer determines the lines of position and displays the latitude and longitude of the aircraft. The pilot can enter the latitude and longitude of the destination airport or of waypoints along the way, and the LORAN will display the bearing to the location, the distance to that point, and the ground speed of the aircraft, and estimated time of arrival (ETA) at the point.
LORAN A. A LORAN system that operates with frequencies of 1,950 kHz, 1,850 kHz, and 1,900 kHz.
LORAN C. The LORAN system used in aircraft. It operates on a frequency of 100 kHz.
Industry:Aviation
A type of electronic oscillator that changes direct current into pulsating DC with a sawtooth waveform. A capacitor is charged through a resistor to produce a slow rise in voltage. At a specified voltage, the gas in a gas-filled electron tube becomes ionized and conducts. The capacitor immediately discharges through this ionized gas.
The frequency of oscillation is determined by the values of the capacitor and the resistor and by the ionization voltage of the gas in the tube.
Industry:Aviation
A type of electronic oscillator that has two conditions. It is stable in one of these conditions and tries to remain in this condition, but a special signal can cause it to shift to the other. As soon as the signal is removed, it automatically returns to its first condition.
Industry:Aviation
A type of emergency light signal used by ships and aircraft. A special pistol, a Very pistol, fires a cartridge that looks much like a shotgun cartridge. The cartridge sends up a ball of white or colored fire that can be seen for several miles during the day or night.
Industry:Aviation
A type of engine lubricating oil made by chemical synthesis (changing) of a mineral-, animal-, or vegetable-oil base. Synthetic oils have appropriate additives that give them such characteristics as low volatility, low pour point, high viscosity index, good lubricating qualities, low coke and lacquer formation, and low foaming.
Synthetic oils are superior to natural mineral oils because they resist oxidation better, and they are able to be used over a wider range of operating temperatures. Synthetic oils are used in almost all gas turbine engines and are used to some extent in reciprocating engines.
Industry:Aviation
A type of engineering drawing used in the design and manufacture of aircraft, aircraft engines, and various components. Lines in the drawing appear white on a dark blue background.
The original drawing is made with black ink on translucent drawing paper or cloth. This drawing is then used as a negative, and sensitized paper is exposed through the drawing by exposing it to a high-intensity light. After the exposure, the print is developed by washing it in water.
Blueprints have been replaced in many engineering departments by prints made by the Ozalid process, in which the exposed sensitized paper is developed by exposing it to ammonia fumes.
Industry:Aviation
