(2)The Director-General may authorise any person, subject to such conditions as may be specified by the Director-General, for the purpose of examining, and testing any person or aircraft or inspecting any document or aviation facility for the purpose of grant of a licence or a certificate or an approval under these rules or the provisions of the Aircraft Act, 1934 (22 of 1934) and such authorisation shall specify the functions of the person so authorised to perform on behalf of the Director-General and the said authorisation shall be for a period as specified therein.