航空術(shù)語詞典Dictionary of Aeronautical Terms 中

時(shí)間：2011-03-11 23:13來源：藍(lán)天飛行翻譯 作者：admin 點(diǎn)擊：次

The body of an inside micrometer is the same as that used on an outside micrometer caliper. The ends of the thimble and the spindle are rounded, and when the zero mark on the thimble is lined up with the zero index on the sleeve, the end of the spindle and the end of the thimble are exactly two inches apart, and the spindle will move out of the thimble for exactly one inch. Extensions can be fastened into the end of the spindle to measure diameters greater than three inches.
insolation (meteorology). Incoming solar radiation falling upon the earth and its atmosphere.
Inspection Authorization. See IA.
inspection door (aircraft component). A small hinged cover installed over an opening in an aircraft structure. These openings allow the inspection of the inside of the aircraft.
inspection plate (aircraft component). A plate or panel used to cover an inspection opening in an aircraft structure. Inspection plates in nonstressed portions of the structure may be held in place with a few machine screws or self-tapping sheet-metal screws, but inspection plates in a highly stressed portion of the structure are held in place with a large number of high-strength structural screws.
instability (meteorology). A general term used to indicate various states of the atmosphere in which spontaneous convection will occur when prescribed criteria are met. Instability of the air indicates turbulence.
installation drawing (aircraft drawing). A drawing used to show the way subassemblies are put together to make a complete assembly. A bill of materials included with an installation drawing gives the name and part number of all the components used to connect the subassemblies. Dimensions are not normally given on an assembly drawing, but where dimensions are needed, they are shown on the detail drawings for the parts listed in the installation drawing.
installation error (static air system error). An error in any of the instruments connected to the aircraft static air system, caused by the static air source not being located in an area in which the air is absolutely still (static). Installation error affects the airspeed indicator, altimeter, and vertical speed indicator, and it changes as the angle of attack of the aircraft changes.
instantaneous rate of climb indicator (aircraft flight instrument). A type of vertical speed indicator that compensates for the lag inherent in these instruments. When the aircraft pitches at the beginning of a climb or descent, two accelerometer-actuated air pumps inside the instrument case send a change of air pressure into the indicating bellows to start the pointer moving in the correct direction. As soon as the aircraft actually begins changing altitude, the change in static air pressure actuates the instrument mechanism.
instrument. 14 CFR Part 1: “A device using an internal mechanism to show visually or aurally the attitude, altitude, or operation of an aircraft or aircraft part. It includes electronic devices for automatically controlling an aircraft in flight.”

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