- 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 form of metal rolled out into very thin sheets. Foil is normally thought of as a sheet of metal with a thickness of less than 0.15 millimeter (0.006 inch).
Industry:Aviation
A form of multipointer pneumatic altimeter with an adjustable barometric scale that allows the reference pressure to be set to any desired level. Sensitive altimeters have a high degree of mechanical amplification in their movement. The small amount of movement of the expanding bellows inside the instrument is multiplied enough to rotate one of the pointers completely around the dial for a pressure change equivalent to only one thousand feet of altitude. This is approximately one inch of mercury.
Industry:Aviation
A form of navigation instrument that uses a gyroscope as a stable reference for a direction-seeking pickup. The direction-seeking pickup of a gyrocompass lines up with the magnetic field of the earth just as an ordinary magnetic compass, but the gyroscope keeps it from oscillating.
Industry:Aviation
A form of navigation instrument which gets its directional reference from lines of magnetic flux of the earth cutting across the windings of a flux valve mounted in the aircraft.
The output of the flux valve is used to drive the pointer of the radio magnetic indicator (RMI) or some other type of direction indicator.
Industry:Aviation
A form of navigation used by airplanes and ships. Location fixes are found by observing the angle between the observer and one of the navigational stars, and noting the exact time the observation is made. The exact location of the navigational star at the time of the observation is found by referring to a nautical almanac.
The location on the earth’s surface of the star at the time of observation and the angle between the star and the observer are plotted on a navigational chart. Celestial navigation has been almost entirely replaced by various forms of electronic navigation, which are more accurate and easier to use.
Industry:Aviation
A form of nondestructive inspection in which a piece of photographic film is exposed by X-rays passing through a section of the aircraft structure. The density of the structure determines the amount of energy passed to the film. Because of the different densities of the structure, an image of the structure is formed on the film.
X-ray inspection is used to examine the inside of a structure for corrosion or damage that deforms the structure.
Industry:Aviation
A form of nondestructive inspection of parts subject to vibration. In this method of inspection, the part is cleaned and soaked with a fluorescent penetrant for an appropriate length of time. Then the part is rinsed, and all the penetrant is cleaned from its surface.
The part is vibrated while it is being examined under a black light. If the vibration opens up a crack that has accepted some of the penetrant, the crack will show up as a blinking light.
Industry:Aviation
A form of nondestructive inspection used to detect surface faults in either ferrous or nonferrous metals or in nonporous, nonmetallic materials. The part to be inspected is thoroughly cleaned and soaked in a penetrating liquid that contains a fluorescent dye. After the part has soaked for a specified period of time, all the penetrant is washed off its surface, and it is dried.
The part is then covered with a developer, a chalk-like powder, that pulls the penetrant out of any cracks or faults into which it has seeped. The part is then inspected under an ultraviolet light that causes any penetrant pulled from a fault to show up as a bright spot or line on the surface.
Industry:Aviation
A form of nondestructive inspection used to detect the presence of internal damage or faults in a piece of aircraft structure. Pulses of ultrasonic energy are introduced into the material being inspected, and the time required for these pulses to travel through the material and return to the transducer is measured.
If there is a fault in the material, the pulses will bounce off it, rather than traveling all the way to the rear surface of the material. This short travel time indicates the presence of a fault.
Industry:Aviation
A form of nondestructive inspection used to locate faults in a metal part. Eddy currents are induced into the part being inspected and also into a similar part known to be sound. The presence of a defect is indicated by a difference in the amount of current needed to induce the eddy current in the two parts.
Industry:Aviation
