DECIBEL (db), A unit of gain derived by computing the 分貝，

ratio of input power to output power.                 以輸人與輸出功率的比率來(lái)推算的一個(gè)增量單位。分貝

                                                    通常表示兩個(gè)聲音信號(hào)或電力信號(hào)在功率或強(qiáng)度方面的

                                                    相對(duì)差別的單位，相當(dāng)于兩個(gè)水平的比率的常用對(duì)數(shù)的十

                                                    倍

DECISION ALTITUDE/HEIGHT (DA/H), A specified        決斷高度/高（DA ／H），

altitude or height (A/H) in the precision approach at 在繼續(xù)進(jìn)近必需的目視參考沒(méi)有建立的情況下開(kāi)始復(fù)

which a missed approach must be initiated if the    飛的精密進(jìn)近中的一個(gè)指定高度或高（A ／H）。

required visual reference to continue the approach has

not been established.

DECISION HEIGHT (DH) 1, With respect to the         決斷高（DH）1，

operation of aircraft, means the height at which a    就飛機(jī)操縱而論，指在使用儀表著陸系統(tǒng)或精密著陸雷

decision must be made, during an ILS or PAR         達(dá)引導(dǎo)進(jìn)近時(shí)，必須要作出的是繼續(xù)進(jìn)近，還是中斷進(jìn)場(chǎng)

instrument approach, to either continue the approach or 復(fù)飛決定時(shí)的高。

to execute a missed approach.

DECISION HEIGHT (DH) 2, An altitude used during a   決斷高（DH）2，

precision approach to trigger the decision of either  精密進(jìn)近時(shí)產(chǎn)生繼續(xù)著陸還是復(fù)飛決定的高。

landing or go-around.

DECOMPRESSION, The loss of internal aircraft air    失壓，

pressure.                                               飛機(jī)失去內(nèi)部空氣壓力。

DE-ENERGIZE, To turn off or cause to not operate.   斷開(kāi)，

                                                        關(guān)斷或使不工作。

DEFUEL, A method for removing fuel from the tanks   排油，

using airplane fuel pumps or external suction.          用飛機(jī)的油泵或外部的吸油裝置將燃油從燃油箱排

                                                    出的方法。