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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rebreather oxygen mask. A type of mask used with a continuous-flow oxygen system. Oxygen continuously flows into the bottom of the loose-fitting rebreather bag on the mask, and the wearer of the mask exhales into the top of the bag. The first air exhaled contains some oxygen, and this air goes into the bag first. The last air to leave the lungs contains little oxygen, and it is forced out as the bag is filled with fresh oxygen. Each time the wearer of the mask inhales, the air first exhaled, along with fresh oxygen, is taken back into the lungs, or rebreathed. rebuilt engine. A used engine that has been completely disassembled, inspected, repaired as necessary, reassembled, tested, and approved in the same manner and to the same tolerances and limits as a new engine, using either new or used parts. The parts used in a rebuilt engine must conform to all production drawings, tolerances, and limits for new parts or be of approved oversize or undersize dimensions allowed for a new engine. According to 14 CFR 91.421, a rebuilt engine is considered to have no previous operating history and may be issued a zero-time logbook. Only the engine manufacturer or an agent approved by the manufacturer can rebuild an engine and issue a zero-time record. receiver-dryer (vapor-cycle cooling system component).The component in the high side of a vapor-cycle cooling system that serves as a reservoir for the liquid refrigerant. The receiver-dryer contains a desiccant that absorbs any moisture that may be in the refrigerant. reciprocal. Opposite. If the heading of an aircraft is 270°, its reciprocal heading is 090° (the heading in the opposite direction). The reciprocal of a number is the number one, divided by the number. The reciprocal of two is one-half, one divided by two (1 ÷ 2 or 1/2). reciprocating engine. A type of heat engine that changes chemical energy in fuel and air into mechanical energy. A mixture of fuel and air is drawn into a cylinder as a close-fitting piston moves downward. The valve through which the fuel-air mixture entered the cylinder closes, and the piston moves up, compressing the mixture. As the piston nears the top of its stroke, the compressed mixture is ignited, and it burns. The burning gases heat the air in the cylinder, and as it expands, it pushes the piston downward. The reciprocating piston is connected to a crankshaft throw by a connecting rod. As the piston moves up and down in the cylinder, the connecting rod rotates the crankshaft. reciprocating saw (metal-cutting tool). A saw that cuts metal as its blade moves back and forth across the work. Pressure is applied to the blade only on its forward stroke, and the blade is lifted from the work on its return stroke. reclaimed oil (petroleum product). Used lubricating oil that has been processed to remove the impurities. recombination (semiconductor device). The action in a semiconductor device that occurs when a free electron fills a hole. The hole and the free electron disappear at the same time. |
