acrylic plastic material used for aircraft windshields and 是一个注册商品名。是飞机风档与侧风档所用的透明丙

side windows. JARGON TERM - sheet plastic of several  烯酸塑胶制品。行家称之为多用途化学合成胶片。

types and used for any purpose.

PMC, SEE - POWER MANAGEMENT CONTROL                   动力管理控制，

                                                        见 Power Management Control．

PNEUDRAULIC, A system or process which is a           气动液压，

combination of hydraulic and pneumatic pressures.       由液压和气压混合推动的系统或过程。

PNEUMATIC (NO. 1), Cold air, controlled and/or        压缩空气（NO．1），

pressurized.                                            经控制和／或增压后的冷空气。

                                     TECHNICAL DICTIONARY                                   114

----------------------- Page 116-----------------------

英汉对照民用航空词典                                   BOEING

PNEUMATIC (NO. 2), Air, controlled and/or          压缩空气 （No．2），

pressurized.                                         经控制和／或增压后的空气。

POP OUT INDICATOR, A device on a filter which      弹出指示器，

protrudes from its housing when a specific differential 过滤器的一个装置。到达一定的压差时，它会从壳体内

pressure is reached.                               伸出来。

POROSITY, The term for pores or small cavities     气孔，

throughout a material.                               指充满整个物体的细微小孔或空隙。

POSITION SHIFT, An FMC operation used to change    移位，

the reference of present position.                   用于改变现在位置基准的飞行管理计算机的一种操作。

POSITIVE, Definite and intentional.                肯定的，