The Air Navigation Order 2000

Area navigation equipment—aircraft registered in the United Kingdom

50—(1) An aircraft registered in the United Kingdom shall not fly in controlled airspace notified for the purposes of this paragraph as an area navigation route or area unless:

(a) it is equipped with area navigation equipment which is approved by the CAA in relation to the purpose for which it is to be used, and which is installed and maintained in a manner approved by the CAA; and

(b) the said equipment is capable of being operated so as to enable the aircraft to maintain the navigation accuracy notified in respect of the airspace in which the aircraft is flying, and it is so operated.

(2) An aircraft registered in the United Kingdom shall not, when flying in controlled airspace notified for the purposes of this paragraph, not being an area navigation route or area, be navigated by means of area navigation equipment unless:

(a) the said equipment is approved by the CAA in relation to the purpose for which it is to be used, and is installed and maintained in a manner approved by the CAA; and

(b) the said equipment is capable of being operated so as to enable the aircraft to maintain the navigation accuracy notified in respect of the airspace in which the aircraft is flying, and it is so operated.

(3) (a) For the purposes of this article, an approval shall be in writing and may be subject to such conditions as the CAA thinks fit.

(b) An approval may be granted in respect of any aircraft or specified class or category of aircraft or in respect of a specified type or types of equipment.