2854. A hole of several inches in diameter may be cut in a piece of metal at a point where the metal is not needed for strength, and the edges of the hole are flanged to give it rigidity

509. John will call you in advance to tell you when and where to meet

508. Go-around arms when the airplane is in the air and, one of these conditions is true: Glideslope mode is active The trailing edge flaps are not up

507. Block to block time is the amount of elapsed time between an aircraft leaving the departure ramp for the purpose of flight and its reaching the arrival ramp at the end of the flight

506. Aerodynamic forces are the basic forces acting on an aircraft in flight that are caused by the movement of the air over the surfaces Thurst acts forward, drag acts rearward, lift acts vertically upward and weight acts vertically downward

505. Procedures contain instructions that tell you how to do a task Long sentences are not easy to understand In STE, the maximum length of a sentence for procedures is 20 words

504. 在钢表面上涂油。

503. 遵守安全说明

502. 确保阀门可以运行。

501. 维修手册的索引应与第20部分的基本标准分类兼容。然而,制造商可以省略不适用于其产品的系统或章节,或者在可行的情况下合并系统或章节。

500. APU火警系统在驾驶舱内启动与发动机相同的火警警报。