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PRECISION APPROACH PROCEDURE, A standard               精密進(jìn)近程序，

instrument approach procedure in which an electronic     己提供有電子下滑道／下滑航徑的標(biāo)準(zhǔn)儀表進(jìn)近程序。

glide slope/glide path is provided; e.g., ILS/MLS and  如：儀表著陸系統(tǒng)／微波著陸系統(tǒng)，以及精密進(jìn)近雷達(dá)。

PAR.

PRESSURE, Force per unit area usually measured in      壓力，

pounds per square inch (psi).                            單位面積上的力。通常用磅／平方英寸（psi）來(lái)度量。

PRESSURE ALTITUDE, The altitude displayed when         壓力高度，

the barometric pressure on the altimeter is set to 29.92 當(dāng)高度表上的氣壓調(diào)至29．92英寸汞柱時(shí)顯示的高度。

inches of mercury.

PRESSURE REGULATING AND SHUTOFF VALVE, A               壓力調(diào)節(jié)和關(guān)斷活門(mén)，

valve in the pneumatic system for regulating bleed air   氣源系統(tǒng)中用以調(diào)節(jié)從發(fā)動(dòng)機(jī)到氣源總管的引氣壓力

pressure from the engine to the pneumatic manifold.    的活門(mén)。

PRINTED CIRCUIT CARD, A plastic or fiberglass card     印刷電路板，

with electronic components and copper strips forming a     由電子部件和銅絲所組成電路的塑膠或纖維玻璃制

circuit.                                               薄板。

PRIORITY VALVE, A valve in the hydraulic system for    優(yōu)先活門(mén)，

operation of components in proper sequence.              液壓系統(tǒng)中，用來(lái)使各部件照合適順序操作的活門(mén)。

PROCEDURE TURN, A maneuver where it is                 程序轉(zhuǎn)彎，

necessary to reverse direction to establish the airplane 在飛機(jī)必須反向建立最后進(jìn)近航道時(shí)所做的機(jī)動(dòng)動(dòng)作。

on the final approach course.

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英漢對(duì)照民用航空詞典                                       BOEING

PROXIMITY SENSOR, An electromagnetic device that        鄰近傳感器，

senses the position of a moving actuator. The sensor      能夠感知運(yùn)動(dòng)中的作動(dòng)筒位置的電磁裝置。該傳感器