Air Ministry Official Notices: Instructions to Aircraft Owners and Ground Engineers Including Cancellations and Corrigenda

The Air Navigation Directions, 1928 (A.N.D. 7) stipulate that the certification of an aircraft, in accordance with paragraph 8 of Schedule II of the Air Navigation Order, shall be made, in respect of the aircraft itself, by a ground engineer licensed in category “A” and in respect of the engines and engine installations, by a ground engineer licensed in category “C.”