时间：2011-03-11 23:11来源：蓝天飞行翻译 作者：admin 点击：次
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If the RPM drops below that for which the governor is set, the propeller pitch will decrease, and the decreased air load allows the engine to speed back up to its on-speed condition. constant-voltage charge (batteries). A method of charging aircraft batteries in which a constant voltage is placed across the battery while it is being charged. When a battery is discharged, its voltage is low and the charging current is high. But as the battery becomes charged, its voltage rises and the charging current decreases. When the battery voltage is the same as the voltage of the charging source, no more charging current flows. Aircraft generators charge the batteries with a constant-voltage charge. constant-voltage power supply (electronic power supply). A regulated power supply that maintains a constant output voltage as the electrical load varies. constant-volume cycle of energy release. The cycle of energy transformation used by a reciprocating engine. See Otto cycle. constrained-gap igniter (gas turbine engine igniter). A type of igniter used in a gas turbine engine ignition system. The center electrode is set back into the insulator so the spark jumps out past the end of the igniter. Constrained-gap igniters do not protrude into the combustion liner, so they run cooler than annular-gap igniters. contact (engine starting command). The term used between a person hand-propping an aircraft engine and the person in the cockpit. When the person is ready to spin the propeller, he or she calls “contact.” The person in the cockpit turns on the fuel, slightly opens the throttle, applies the brakes, and replies “contact,” and then turns the ignition switch to BOTH. The propeller is then pulled through to start the engine. contact approach (air traffic control). An approach in which an aircraft on an IFR flight plan, having an air traffic control authorization, operating clear of clouds with at least one mile flight visibility and a reasonable expectation of continuing to the destination airport in those conditions, may deviate from the instrument approach procedure and proceed to the destination airport by visual reference to the surface. contact cement. A type of adhesive that is spread on both surfaces to be joined and allowed to dry. The dried contact cement is not sticky to touch, but when the two coated surfaces are brought into contact with each other, they bond tightly together. contact flying. Flight in which the attitude of the aircraft is maintained and its navigation is done by visual reference to the horizon and to the ground over which the aircraft is flying. contactor (electrical control device). A heavy-duty, remotely operated switch used to control electrical circuits carrying large amounts of current. contaminant. An impurity that pollutes. Dirt and water are contaminants that pollute aircraft fuel. contaminated runway (air traffic control). A runway is considered contaminated whenever standing water, ice, snow, slush, frost in any form, heavy rubber, or other substances are present. |
