PEEN, To cause a more corrosion resistant surface by   噴九，

multiple impacting it with a hard material such as steel 為形成防腐能力更強的表面，多次用諸如鋼丸的堅硬材

pellets. Term for this is Shot Peening.                料沖擊表面。這個過程名為噴丸硬化處理。

PERCENT MEAN AERODYNAMIC CHORD (% MAC),                平均氣動弦百分比，

Defines a position on the aircraft relative to the mean  用來確定飛機上一點相對于機翼平均氣動弦的位置。

aerodynamic chord of the wing.

PERCENT N 1 , Expresses the speed of the low           N1百分數，

pressure compressor rotor as a percentage of a fixed     以一定量的百分比而不以每一單位時間轉數來表示低

amount rather than revolutions per unit time.          壓壓氣機轉子的轉速。

PERCENT N2 , Expresses the speed of the high           N2百分數，

pressure compressor rotor as a percentage of a fixed     以一定量的百分比來表示高壓壓氣機轉子的轉速。

amount.

PERFORMANCE DATA COMPUTER SYSTEM (PDC,                 性能數據計算機系統（PDC，PDCS），

PDCS), A device which provides data to achieve the       一個能提供數據，使飛機達到最有效和最經濟的操作的

most efficient and economical operation of the airplane. 裝置。

PHASE OF FLIGHT, A portion of flight specifically      飛行階段，

devoted to accomplishing such things as takeoff, climb,  飛行中負有一定任務（如起飛、爬升、巡航、下降或

cruise, descent or landing.                            著陸）的部份。

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英漢對照民用航空詞典                                      BOEING

PHILLIPS HEAD SCREW, A cross point screw with two      十字螺絲釘，

distinct tapers. Driven with a flat tipped Phillips head 螺絲的頂面有兩個明顯的錐形十字四槽的螺絲釘。由平

screwdriver (see Reed and Prince).                     頂十字頭螺絲鉆驅動。

PITCH, The rotation of an airplane around its lateral  俯仰，

axis.                                                    飛機繞橫軸運動而造成機頭的上下運動。