- Отрасли: 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 ...
An electrohydraulic control in an airplane’s power brake system that prevents the wheels skidding on wet or icy runways.
A wheel-speed sensor monitors the deceleration rate of every main landing gear wheel. If any wheel decelerates too rapidly, indicating an impending skid, pressure to that brake is released and the wheel stops decelerating. Pressure is then reapplied at a slightly lower value.
Industry:Aviation
An electrolytic action which takes place inside a metal or on its surface. The metal reacts with an electrolyte, and part of the metal is changed into a salt, which is the corrosion. Corrosion is dry and powdery and has no physical strength.
Industry:Aviation
An electrolytic capacitor connected in parallel with the output of a DC power supply. The capacitor has a low impedance for any ripple that may be superimposed on the DC output, and the ripple is passed to ground, while the DC is not affected.
Industry:Aviation
An electrolytic capacitor which uses strips of aluminum as the plates. An oxide film formed on the surface of the aluminum acts as the dielectric.
The aluminum plates are separated by layers of absorbent paper saturated with a liquid electrolyte.
Industry:Aviation
An electrolytic capacitor with the ability to automatically restore the oxide film dielectric to the plate if the film is ever punctured by too high a voltage.
Industry:Aviation
An electromagnet with a movable iron core that can be pulled into the coil. When current flows in the coil, the resulting magnetic field pulls the core into its center. When no current is flowing in the coil, a spring moves the core out of the coil. Solenoids can be used to operate valves, switches, and mechanical locks, as well as many other types of devices.
Industry:Aviation
An electromagnetic relay used to change steady direct current into pulsating DC. Current flowing through a relay coil produces an electromagnetic pull that opens a set of contacts that are normally held closed by a spring. The coil and contacts are connected in series so the current flowing in the coil stops as soon as the contacts open.
When the contacts open, the coil loses its electromagnetic pull, and the spring closes the contacts, restoring the current to the coil. The frequency of the pulsating DC is determined by the magnetic characteristics of the relay.
Industry:Aviation
An electromagnetically operated switch whose operating coil requires very little current to close the switch contacts. Sensitive relays are used in photoelectric and thermocouple circuits. The very small current produced by a photocell or thermocouple operates the relay, and the relay contacts control enough current to operate other equipment.
Sensitive relays are being replaced today with solid-state devices that do the same job, but have no moving parts.
Industry:Aviation
An electron control valve that has most of the air removed from the glass or metal envelope in which the electrodes are mounted. After as much air is removed from the envelope as is practical, a “getter” is ignited inside the tube to combine with any oxygen left inside the envelope.
Industry:Aviation
An electron spinning in an orbit around the nucleus of an atom. The term orbital electron is used to distinguish these electrons from free electrons moving from one atom to another.
Industry:Aviation
