- 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 relative location approximately at right angles to the longitudinal axis of an aircraft. When an object is beside the aircraft, it is said to be abeam of it.
Industry:Aviation
A relatively low pressure maintained inside the bearing cavities of an engine-driven hydraulic pump.
If the shaft or the bearings (bushings) of the pump should become damaged, case pressure will force hydraulic fluid out of the pump, rather than allowing air to be pulled in.
Industry:Aviation
A relatively small-scale downward current of air. Downdrafts are often observed on the lee side of large objects that restrict the smooth flow of the air or in precipitation areas in or near cumuliform clouds.
Industry:Aviation
A relatively soft, malleable, stable, rare-earth chemical element. Holmium’s symbol is Ho, its atomic number is 67, and its atomic weight is 164.93. Holmium has a melting point of around 1,500°C.
Industry:Aviation
A relatively thick, narrow-chord wing used on some airplanes. A Davis wing has a relatively low drag and a stable center of pressure, and it develops lift at low angles of attack. The B-24 Liberator bomber of World War II used the Davis wing.
Industry:Aviation
A relaxation oscillator using a neon bulb to produce oscillation. The bulb is installed in parallel with a capacitor. When DC voltage is applied to the circuit through a resistor, the voltage across the bulb and capacitor rises until the ionization voltage of the bulb is reached. As soon as the neon gas ionizes, it short-circuits the capacitor, and the voltage drops to the deionization voltage, at which time conduction stops. The waveform of a neon-bulb oscillator is a sawtooth.
Industry:Aviation
A relay in a multiengine aircraft electrical system that controls a flow of control current which is used to keep the generators or alternators sharing the electrical load equally. The relay opens automatically to shut off the flow of paralleling current any time the output of either alternator or generator drops to zero.
Industry:Aviation
A relay that, once energized, remains in its energized condition after the current stops flowing in its coil. When the relay is energized, the contacts are locked in the energized position by a mechanical latch. A mechanical release must be actuated to allow the relay to return to its de-energized condition.
Latching relays are being replaced to a great extent by solid-state flip-flop circuits.
Industry:Aviation
A relay whose contacts are held closed by a spring. The contacts are opened by the magnetic pull of an electromagnet.
Industry:Aviation
A relay whose contacts are held open by a spring. The contacts are closed by the magnetic pull of an electromagnet.
Industry:Aviation
