时间：2011-03-11 23:18来源：蓝天飞行翻译 作者：航空 点击：次
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Steel parts are often plated with cadmium to sacrificially protect them from corrosion. If the coating of cadmium is scratched through to expose the steel, a corrosion cell is formed between the cadmium and the steel. The cadmium, being more anodic (more chemically active) than the steel, will be changed into a salt and it, rather than the steel, will corrode. saddle gusset. A piece of plywood glued to an aircraft structural member. The saddle gusset has a cutout to hold a backing block or strip tightly against the skin to allow a nailing strip to be used to apply pressure to a glued joint in the skin. saddle-mount oil tank (gas turbine engine component). A type of lubricating oil tank used with a gas turbine engine. A saddle-mount tank is shaped in such a way that it fits around the curvature of the engine compressor case in much the same way a saddle fits a horse. SAE (Society of Automotive Engineers). A professional organization that formulates standards for the automotive and aviation industries. safety alert (air traffic control). An alert issued by ATC to aircraft under their control if ATC is aware that the aircraft is at an altitude which, in the controller’s judgment, places it in unsafe proximity to terrain, obstructions, or other aircraft. The controller may discontinue the issuance of further alerts if the pilot advises he is taking action to correct the situation or has the other aircraft in sight. safety belt. A belt installed in an aircraft to hold the occupants tight in their seat. Safety belts are also called seat belts or lap belts. safety factor (structural design). The ratio of the maximum load a structure is designed to support, to the maximum load it will ever be required to support. If a beam is expected to support a maximum load of 10,000 pounds and is designed in such a way that it can support 20,000 pounds, it has a safety factor of two. safety gap (magneto ignition system). A location inside a high-tension magneto in which a portion of the metal housing is close enough to the high-voltage terminal to prevent the secondary voltage building up high enough to damage the coil insulation. The spark plug normally provides the gap for the spark to jump, but if a lead is off a spark plug, the secondary voltage could build up high enough to damage the coil insulation. Rather than the voltage building up this high, it jumps the safety gap. safety glass. A type of glass that does not leave jagged fragments when it breaks. Safety glass may be made by laminating a layer of resilient transparent plastic material between two sheets of glass. This type of safety glass will break, but all of the pieces stick to and are held by the center plastic layer. Another form of safety glass is tempered glass that breaks into small grains, rather than into sharp pieces. safety valve (pressure system component). A pressure relief valve used on containers holding a compressible fluid under pressure. If the pressure inside the container becomes excessive, the safety valve will pop off its seat and relieve the excess pressure. |
