669、There is sufficient oil in the tank.

654、The navigation lights change from dim to bright.

653、The manufacturer may establish procedures to provide feedback on unairworthy conditions.

652、the load is applied axially.

651、The information to be included on the cover will be left to the manufacturer’s discretion.

650、The gyroscope will become stable after approximately 15 seconds.

649、The generators supply a three-phase voltage.The frequency of this voltage increases when the generator rotor speed increases.

648、The gas charging valve is on the top of the shock strut of the nose landing gear.

647、The function and operation of each unit in the system should be described as well as the location of the units.

646、The first step should always be job Set-up and last should be Close Up or Clear-Up.

645、The elevators must move symmetrically.