时间：2011-03-11 23:18来源：蓝天飞行翻译 作者：航空 点击：次
|
skunk works. A section of an aircraft factory set aside for research and development of new aircraft. No one is allowed to visit the skunk works except those who are actually involved in the project being developed there. Skydrol hydraulic fluid. The registered trade name of a synthetic hydraulic fluid used in most modern high-performance aircraft. Skydrol hydraulic fluid has a phosphate-ester base, is nonflammable, and is usable over a wide range of temperatures. Skydrol hydraulic fluid meets Military Specifications MIL-H-8446. sky wave (radio transmission). The portion of an electromagnetic signal that radiates upward from the antenna until it strikes the ionosphere, then bounces back to the earth. slag (welding product). The hard, brittle, glass-like material that covers a weld bead that has been made with a coated welding rod. The flux coating on the rod melts in the heat of the arc and flows out ahead of the bead. The melted flux covers the metal where the weld is being made and keeps oxides from forming in the weld. When the weld is made, the liquid flux hardens into slag that must be chipped off to allow the bead to be inspected. slam acceleration (gas turbine engine operation). Improper operation of the power control lever of a gas turbine engine in which the control is moved forward too quickly to allow the engine to accelerate as it should. There is danger of a rich flameout if the fuel is metered into the engine before the compressor is able to pull enough air into the engine to furnish the correct fuel-air mixture ratio. slant-line distance (aircraft navigation). The actual distance between an aircraft and a ground radio facility. A distance measuring equipment (DME) indicator shows the slant-line distance between the aircraft and the ground station. Slant-line distance is the hypotenuse of a right triangle, with the altitude of the aircraft as one side, and the horizontal distance between the ground station and a point directly below the aircraft as the other side. slant range (radar measurement). The actual distance between a ground-based radar antenna and an airborne target. slant visibility (meteorology). The distance an airborne observer can see and distinguish objects on the ground. slash (radar indication). A radar beacon reply displayed on a radar scope as an elongated target. slat (aircraft control). A secondary control on an airplane that allows the airplane to fly at a high angle of attack without stalling. A slat is a section of the leading edge of the wing mounted on curved tracks. These tracks move into and out of the wing on rollers. In flight at low angles of attack, the air pressure on the wing holds the slat in, and it forms the leading edge of the wing. At a high angle of attack, aerodynamic forces pull the slat forward on its tracks, and it forms a duct that forces the air down onto the top of the wing to keep it from stalling. slaved gyro (aircraft flight instrument). A gyro-stabilized direction indicator whose directional signals are produced by a flux valve. See flux valve. |
