The beacon for a land-based civil airport is an alternating white and green light.
The beacon is operated from sunset to sunrise and when less than VFR conditions during the day.
The helicopter is to avoid the flow of fixed-wing traffic.
On the common radio frequency, state the airport, helicopter tail number, distance, direction and altitude.
If radio fails, the transponder should be set to 7600 and light signals should be received from the tower.