5Transitional arrangements

5 Transitional arrangements

Regulation 4 does not apply to an aircraft: (a) of the kind described in paragraph 4 (1) (a)—if the aircraft: (i) was registered under the Civil Aviation Regulations immediately before the commencement of these Regulations; and (ii) continues to be so registered; unless, if the aircraft was so designed and constructed as to prevent intentional fuel venting, a modification of the aircraft that occurs after the commencement of the Regulations allows intentional fuel venting; or (b) in relation to an engine of the kind described in paragraph 4 (1) (b) or (c): (i) if: (A) the engine is of a type that was in the possession of the aircraft operator immediately before the commencement of these Regulations; and (B) engines of that type have remained in the possession of the operator since the commencement of these Regulations and been in use for a purpose relating to the operation of the aircraft; or (ii) if: (A) the engine is of a type acquired by the operator after the commencement of these Regulations under a contract entered into by the operator before the commencement of these Regulations; and (B) engines of that type have remained in the possession of the operator since that acquisition and been in use for a purpose relating to the operation of the aircraft.