has two or three wires.                                 有兩或三根電線。

PROXIMITY SENSOR ACTUATOR, A steel plate                鄰近傳感器作動器，

located on a moving component for operation of            位于一個運動部件上，用以操作鄰近傳感器的鋼板。

proximity sensor.

PROXIMITY SWITCH, A printed circuit card for            鄰近電門，

transmitting sensor signals to indicating lights and      用以將傳感器信號傳輸給指示燈和電路的印刷電路板。

circuits.

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英漢對照民用航空詞典                                  BOEING

PRSOV, SEE - PRESSURE REGULATING AND              調(diào)壓和關(guān)斷活門，

SHUTOFF VALVE                                       見 Pressure Regulating and Shutoff Valve．

PTU, SEE - POWER TRANSFER UNIT                    動力轉(zhuǎn)換裝置，

                                                    見 Power Transfer Unit．

PURGE VALVE, A valve in the pneumatic system for  除塵活門，

removal of dirt from the air cleaner.               氣源系統(tǒng)中用以清除空氣清潔器中之灰塵的活門。

PYLON, A structural component for supporting an   吊架，

engine from the wing.                               用以從機翼支撐發(fā)動機的結(jié)構(gòu)件。

Q

QAD, SEE - QUICK-ATTACH-DETACH                    快速裝卸，

                                                      見Quick－Attach－Detach．

QEC, SEE - QUICK ENGINE CHANGE                    快速更換發(fā)動機，