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

PROXIMITY SENSOR ACTUATOR, A steel plate                鄰近傳感器作動(dòng)器，

located on a moving component for operation of            位于一個(gè)運(yùn)動(dòng)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(mén)，

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

circuits.

                                       TECHNICAL DICTIONARY                                     118

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

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

SHUTOFF VALVE                                       見(jiàn) Pressure Regulating and Shutoff Valve．

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

                                                    見(jiàn) Power Transfer Unit．

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

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(mén)。

PYLON, A structural component for supporting an   吊架，

engine from the wing.                               用以從機(jī)翼支撐發(fā)動(dòng)機(jī)的結(jié)構(gòu)件。

Q

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

                                                      見(jiàn)Quick－Attach－Detach．

QEC, SEE - QUICK ENGINE CHANGE                    快速更換發(fā)動(dòng)機(jī)，