The Air Navigation regulations require that the certification of an aircraft before flight shall be made, in respect of the airframe, by an aircraft engineer licensed in Category “A” and in respect of the engines by an aircraft engineer licensed in Category “C”.
(1945), "Air Registration Board: Notices to Licensed Aircraft Engineers and to Owners of Civil Aircraft", Aircraft Engineering and Aerospace Technology, Vol. 17 No. 1, pp. 26-27. https://doi.org/10.1108/eb031211
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