The Air Navigation Order 2016

Height keeping performance – aircraft registered in the United KingdomU.K.
This section has no associated Explanatory Memorandum

82.—(1) An aircraft registered in the United Kingdom must not fly in Reduced Vertical Separation Minimum airspace unless—

(a)it is equipped with height keeping systems which enable the aircraft to maintain the required height keeping performance capability; or

(b)it is otherwise authorised by the appropriate air traffic control unit.

(2) The equipment required by paragraph (1) must—

(a)be approved by F1... the CAA;

(b)be installed in a manner approved by the CAA;

(c)be maintained in a manner approved by the CAA; and

(d)while the aircraft is flying in that airspace, be operated in accordance with procedures approved by the CAA.