- 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 two-component finishing material that is mixed and sprayed over a steel or aluminum alloy aircraft structure. Epoxy primer provides a tough, chemical-resistant covering for the metal to protect it from corrosion and to provide a good bond for a topcoat system.
Epoxy primers are not used in many of the high-volume production lines because of the time needed for them to cure properly.
Industry:Aviation
A two-element electrical device. A diode contains an anode and a cathode and acts as an electron check valve. Electrons can pass from the cathode to the anode, but they cannot pass from the anode to the cathode.
A diode may be either a vacuum tube or a semiconductor device.
Industry:Aviation
A two-element, solid-state electron check valve made of silicon or germanium, doped with appropriate impurities. Electrons can either flow through a semiconductor diode or not flow through it depending upon the polarity of the voltage across it.
When the diode is forward-biased, with the positive voltage connected to the anode, and the negative voltage to the cathode, electrons flow through it. But, when it is reverse-biased, with the negative voltage connected to the anode, electrons do not flow through it.
Industry:Aviation
A two-input linear amplifier, often built into a single integrated circuit (IC) chip. The output is an amplification of the difference between the signals on the two inputs. An operational amplifier is commonly called an op-amp.
Industry:Aviation
A two-part winding made in such a way that the magnetic field produced by one part cancels the field produced by the other. When the magnetic fields cancel each other, there is no opposition caused by inductance. All the opposition is caused by resistance.
Industry:Aviation
A two-part, chemically cured, finishing material that contains a high percentage of solids. Polyurethane enamel requires a long time to flow out, and this long flowing-out time gives the finish a “wet” look. Polyurethane enamel is highly resistant to mechanical abrasion and chemical action.
Industry:Aviation
A two-way communication link between an airliner in flight and the airline’s main ground facilities.
Data is collected in the aircraft by digital sensors and transmitted to the ground facilities. Replies from the ground may be printed out so the appropriate flight crewmember can have a hard copy of the response.
Industry:Aviation
A type of absolute altimeter that measures the height of an aircraft above the terrain. A pulse of radio-frequency energy is transmitted downward from the aircraft. This pulse strikes the ground and is reflected back up to the aircraft where it is received. The time used by the pulse in traveling from the aircraft to the ground and back is changed into feet or meters and is displayed before the pilot. Radio altimeters are sometimes called radar altimeters.
Industry:Aviation
A type of AC motor in which the source current is supplied to the stator winding, and current is induced into the rotor windings. The rotor windings end at copper bars on a commutator, and brushes pick up rotor current. The brushes are connected together so they short-circuit some of the rotor windings.
Rotor current flowing through the short-circuited coils produces a magnetic field whose axis is at an angle to the magnetic field in the stator. Because the two magnetic fields are at an angle to each other, they repel, or push away from, each other.
The brushes of a repulsion motor are usually mounted on a control that allows them to be rotated with reference to the stator field. Moving the brushes controls the direction of rotation and the speed of a repulsion motor.
Industry:Aviation
A type of AC motor whose rotor has current induced into it from stationary field coils. The rotor is made of a stack of soft iron laminations, mounted on a steel rotor shaft. Heavy copper end plates are fastened to the shaft at each end of the stack of laminations. Copper bars fit into slots in the laminations and are welded to each of the end plates.
Changing magnetic fields, caused by AC flowing in the stator windings, induce a large amount of current into the low-resistance bars and the end plates. This current produces a strong magnetic field that reacts with the field in the stator, and the squirrel-cage rotor spins inside the stator. The speed of the rotor is determined by the frequency of the alternating current flowing in the stator windings.
Industry:Aviation
