521. The Federal Aviation Regulations require the use of "maximum continuous power" ， during certification of anairframe and engine combination， to show compliance with certain standards

416.Send reports to the authorities at intervals of three months( )

415.Make sure that the pressure in the cabin is almost zero( )

414.Wrap the lockwire around the regulator ,transducer and coupling assembly in a counter-clockwise direction ( )

413.前款所称维修单位包括独立的维修单位、航空营运人的维修单位和制造厂家的维修单位。( )

412.The words used on a marker shown in Chapter 11 can have a small difference from a marker on your airplane Chapter 11 uses EXAMPLE" to show that there can be a small inference An example of this is the difference between the words "LAVATORY" and "TOILET" ( )"

411.尽管如此,各制造商仍应遵循相同的基本系统和主题安排顺序,即使某些系统可能在不适用时被省略( )

410.Care must be taken not to damage the firewall cover ( )

409.Engage the gear wheel to the spider shaft ( )

408.In aviation , it is mandatory to correctly understand maintenance and operation documentation to make sure that systems operate safely and correctly and to protect human lives ( )

407.Center of gravity is the point at which an airplane would balance if suspended Its distance from the reference datum is: found by dividing the total moment by the total weight of the airplane ( )