510.Database synchronization is in process ( )

427.堵盖的拆卸是必要的 ( )

426.Procedures for handling malfunctions or other abnormalities that are not of emergency nature , or involve a potential emergency that may be deferred may be included in this section ( )

425.If a supply shutoff valve was closed for less than five minutes ho maintenance is required and shutoff periods are not accumulative ( )

424.The trailing edge flaps up limit switch sends flap position data to SMYD 1 The SMYD 1 uses this during yaw damping to limit rudder movement when flaps are up( )

423.Rectify the defect before you stop the pump momentarily ( )

422.Increase the pressure slowly [not more than one tum each minute]( )

421.The difference between the two dimensions must not be more than 010 mm ( )

420.The additional information may be imparted to existing employees through the recurrent training requirements ( )

419.Those instructions necessary to park or store the aircraft in normal or abnormal conditions such as with engines removed aircraft damaged, etc for short or long terms in extremes of weather conditions( )

418.When the engine RPM decreases to 500, stop the engine( )