- Settore: 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 security device used with a radio transmitter to make voice transmissions unintelligible to anyone not having the correct descrambling equipment and the correct code for the day. The scrambler circuit modifies the voice signals being transmitted so they no longer resemble the original sound. When the signals are received by the intended receiver, they are passed through a descrambler that changes them back into their original form.
Industry:Aviation
A self-contained ignition system used with a spark-ignition reciprocating engine. A high-tension magneto contains an alternating current generator that produces a flow of primary current, and a set of breaker points that interrupts this current the instant the spark is needed.
When the primary current stops flowing, its magnetic field collapses. The collapsing lines of flux cut across many thousands of turns of wire in the secondary winding of the built-in magneto coil and induces a high voltage into it. The distributor, which is a high-voltage selector switch, directs the high voltage from the magneto coil to the proper spark plug for ignition.
Industry:Aviation
A self-initiating or self-sustaining action. In a turbocharger system, bootstrapping describes a transient increase in engine power that causes the turbocharger to speed up, which in turn causes the engine to produce more power.
The word bootstrap comes from the figure of speech “a person lifts himself by his own bootstraps.”
Industry:Aviation
A self-propelled machine used to lift heavy weights and move them from one location to another. A forklift has two long steel fingers that can be slid under a pallet on which the load is placed. The fingers can then be raised to lift the load off the floor and move it.
Industry:Aviation
A self-propelled missile which is guided as it goes upward. However, as it comes down, it follows a ballistic trajectory, its natural curved path.
Industry:Aviation
A self-sustaining action in which one event causes other events of the same kind to happen.
It is a chain reaction in nuclear fission that releases so much energy that a neutron is knocked out of the nucleus of an atom. This neutron knocks other neutrons out, and each of them knocks out still other neutrons.
Industry:Aviation
A semiconductor device having two P-sections and two N-sections. Light falling on the LASCR produces gate current that triggers it into a state of conduction.
Industry:Aviation
A semiconductor device made of three layers of doped silicon or germanium. In an NPN junction transistor, layers of N-material are used as the emitter and collector. Between the two layers of N material is a very thin layer of P-material, which acts as the base. Electrons flowing between the emitter and base control the electrons flowing between the emitter and collector.
A PNP junction transistor is like an NPN transistor except that the base is made of N-material between an emitter and collector of P-material.
Industry:Aviation
A semiconductor device that acts as a variable resistor whose resistance is determined by the amount of light shining on it through a built-in lens. The resistance of a photoresistor increases as the amount of light shining on it increases.
Industry:Aviation
A semiconductor device that consists of P-type source and drain regions diffused into a substrate of N-type silicon. A substrate is the supporting material on which an integrated circuit chip is built. The source and drain are on either side of a narrow channel of N-material, and an insulating layer of silicon oxide is deposited over the substrate so it covers the source, the drain, and the channel between them. A gate connection is formed between the source and the drain, and it is insulated from them by the oxide film.
A control voltage applied to the gate causes the material in the channel to act as though it were P-type material, and electrons flow from the source to the drain without having to cross a P-N junction. The source and drain of a MOSFET serve the same functions as the emitter and collector of a bipolar transistor. However, the source and drain can be interchanged, while the emitter and collector of a bipolar transistor cannot.
Industry:Aviation
