S.L. 499.18 Art. 2Interpretation.

In this Order -

"an International Standard Atmosphere at sea level" has the meaning specified in the Manual of the ICAO Standard Atmosphere (Doc 7488) published by the International Civil Aviation Organization; "Annex 16" means Annex 16 to the Convention; "by-pass ratio" means the ratio of the air mass flow through the by-pass ducts of a gas turbine engine to the air mass flow through the combustion chambers calculated at maximum thrust when the engine is stationary in an International Standard Atmosphere at sea level;

"the Convention" means the Convention on International Civil Aviation signed at Chicago on 7 December, 1944;

"the Director" means the Director of Civil Aviation and to the extent of the authority given, any person authorised in that behalf by the Director; "noise certificate" means a document issued or validated by a State or by a competent authority of a State attesting noise certification in respect of an aeroplane either by way of a separate certificate or a statement contained in another document approved by the State of Registry of the aircraft and required by that State to be carried in the aircraft; "prescribed" means prescribed by regulations made by the Minister.

(2) Expressions used in this order shall, unless the context otherwise requires, have the same respective meanings as in the Air

Navigation Act.

(3) Regulations made in connection with and related to this Order shall include the power to make different provisions with respect to different classes of aircraft and with respect to different circumstances and to make such incidental and supplementary provisions as are necessary or expedient for carrying out the purposes of this Order.