Article 90 Provision of air traffic services
In the case of an aerodrome (other than a Government aerodrome) in respect of which there is equipment for providing holding aid, let-down aid or approach aid by radio or radar, the person in charge of the aerodrome shall:
inform the CAA in advance of the periods during and times at which any such equipment is to be in operation for the purpose of providing such aid as is specified by the said person; and
during any period and at such times as are notified, cause an approach control service to be provided.
The CAA may direct that there shall be provided in respect of any aerodrome (other than a Government aerodrome) such air traffic control service, aerodrome flight information service or means of two-way radio communication as the CAA considers appropriate in respect thereof. The CAA may specify in the direction the periods during and the times at which such a service or such means shall be provided and the person in charge of the aerodrome shall cause such a service or such means to be provided in accordance with any such direction.
Obligations to cause an air traffic control service to be provided arising under paragraph (1) or (2) are without prejudice to each other.