Division (a) Wake turbulence separation minima shall be applied to aircraft in the approach and departure phases of flight under the following circumstances:F1

an aircraft is operating directly behind another aircraft at the same altitude or less than 300 m ( 1 000 ft) below it; or

both aircraft are using the same runway or parallel runways separated by less than 760 m ( 2 500 ft); or

an aircraft is crossing behind another aircraft at the same altitude or less than 300 m ( 1 000 ft) below it.