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

時(shí)間：2011-03-11 23:18來源：藍(lán)天飛行翻譯 作者：航空 點(diǎn)擊：次

push-pull rod (aircraft control system component). A stiff rod in an aircraft control system that moves a control surface by either pushing or pulling on it.
pushrod (reciprocating engine component). A stiff rod or hollow tube used to open the intake and exhaust valves of a reciprocating engine. One end of the pushrod rides in the cam follower, and the other end fits in a socket on one end of a rocker arm. When the cam follower rides up on the cam lobe, the pushrod transmits this movement to the rocker arm, and the rocker arm pushes the valve off its seat.
PVC (polyvinylchloride). A thermoplastic resin used to make transparent tubing for insulating electrical wires.
PV diagram (reciprocating engine relationship). A diagram showing the relationship between the volume of a cylinder and the pressure during a cycle of engine operation.
pylon (jet aircraft component). The structure which holds an engine nacelle or pod to the wing or fuselage of a jet-propelled aircraft.
pyrometer. An instrument used to measure high temperatures. Pyrometers usually begin measuring at temperatures above about 600°C.
Pythagorean theorem (mathematics). The statement that the square of the length of the hypotenuse of a right triangle is equal to the square root of the sum of the squares of the lengths of the other two sides.

Q-band radar. Radar that operates in the frequency band from 36 to 46 gigahertz. At this frequency, the wavelength of the energy is between 0.834 and 0.652 centimeter.
QEC assembly (engine maintenance unit). An engine change assembly (quick engine change) that allows an aircraft engine to be changed with the least amount of downtime. The engine is mounted on the engine mounts, all of the accessories and the propeller are mounted on the engine, and the cowling is installed. The QEC assembly essentially contains everything forward of the firewall.
Q-factor of a coil. A measure of the quality factor of the coil. Q is the ratio of the inductive reactance of a coil to its resistance, both measured in ohms.

quadrant (aircraft controls). The housing in an aircraft cockpit on which the engine control levers are mounted. The top of the quadrant is in the shape of a quarter of a circle, and the control levers stick out radially from the quadrant.
quadrant (air traffic control). A quarter part of a circle, centered on a navaid, oriented clockwise from magnetic north as follows: NE quadrant 000°-089°, SE quadrant 090° – 179°, SW quadrant 180° – 269°, and NW quadrant 270° – 359°.
quadrant (mathematics). One of the four parts of a plane formed by the system of rectangular coordinates. The four quadrants are numbered with Roman numerals. I is the upper right-hand quadrant, II, the upper left-hand. III is the lower left-hand, and IV, the lower right-hand quadrant.
quadrantal error. The error in an automatic direction finder system installation caused by the metal in the aircraft. The quadrantal error is different in each of the four quadrants (front right, front left, rear left, rear right).

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