# The Air Navigation (General) Regulations 2005, Paragraph 3: Weight and performance of public transport aeroplanes designated as aeroplanes of performance group D


(1) For the purposes of article 44(6), an aeroplane registered in the United Kingdom, in respect of which there is in force under article 44(5) a permission in which the aeroplane is designated as being of performance group D, shall not fly for the purpose of public transport:
(a) at night; or
(b) when the cloud ceiling or visibility prevailing at the aerodrome of departure or forecast for the estimated time of landing at the aerodrome at which it is intended to land, or at any alternate aerodrome, are less than 1,000 feet and one nautical mile respectively.
(2) Such an aeroplane shall not fly for the purpose of public transport at any other time unless the weight of the aeroplane at the commencement of the take-off run is such that the following conditions are satisfied—
(a) That weight shall not exceed the maximum take-off weight specified for the altitude and air temperature at the aerodrome at which the take-off is to be made.
(b) The take-off run required and the take-off distance required specified as being appropriate to—
(i) the weight of the aeroplane at the commencement of the take-off run;
(ii) the altitude of the aerodrome;
(iii) the air temperature at the aerodrome;
(iv) the average slope of the surface of the aerodrome in the direction of take-off over the accelerate-stop distance available; and
(v) not more than 50 per cent. of the reported wind component opposite to the direction of take-off or not less than 150 per cent. of the reported wind component in the direction of take-off,
shall not exceed the take-off run available and the accelerate—stop distance available, respectively, at the aerodrome at which the take-off is to be made.
(3) Subject to sub-paragraphs (4), (5) and (6), the net take-off flight path with all power units operating, specified as being appropriate to—
(a) the weight of the aeroplane at the commencement of the take-off run;
(b) the altitude at the aerodrome;
(c) the air temperature at the aerodrome; and
(d) not more than 50 per cent. of the reported wind component opposite to the direction of take-off or not less than 150 per cent. of the reported wind component in the direction of take-off,
and plotted from a point of 50 feet above the end of the take-off distance required at the aerodrome at which the take-off is to be made to the point at which the aeroplane reaches a height of 1,000 feet above the aerodrome, shall show that the aeroplane will clear any obstacle in its path by a vertical interval of not less than 35 feet.
(4) If it is intended that the aeroplane will change its direction of flight by more than 15° before reaching 1,000 feet the vertical interval referred to in sub-paragraph (3) shall be not less than 50 feet during the change of direction.
(5) For the purpose of sub-paragraph (3) an obstacle shall be deemed to be in the path of the aeroplane if the distance from the obstacle to the nearest point on the ground below the intended line of flight of the aeroplane does not exceed 75 metres.
(6) In assessing the ability of the aeroplane to satisfy sub-paragraph (3) it shall not be assumed to make a change of direction of a radius less than the specified radius of steady turn.
(7) Subject to sub-paragraph (8) the aeroplane shall:
(a) at any time after it reaches a height of 1,000 feet above the aerodrome from which the take-off is to be made;
(b) in the meteorological conditions expected for the flight;
(c) in the event of any one power unit becoming inoperative at any point on its route or on any planned diversion from it; and
(d) with the other power unit or power units, if any, operating within the maximum specified continuous power conditions,
be capable of continuing the flight at altitudes not less than the relevant minimum altitudes for safe flight stated in, or calculated from the information contained in, the operations manual relating to the aeroplane to a point 1,000 feet above a place at which a safe landing can be made.
(8) In assessing the ability of the aeroplane to satisfy sub-paragraph (7) it shall not be assumed to be capable of flying at any point on its route at an altitude exceeding the performance ceiling with all power units operating which are specified as being appropriate to its estimated weight at that point.
(9) The landing weight of the aeroplane shall not exceed the maximum landing weight specified for the altitude and the expected air temperature for the estimated time of landing at the aerodrome at which it is intended to land and at any alternate aerodrome.
(10) Subject to sub-paragraph (11), the distance required by the aeroplane to land from a height of 50 feet at the aerodrome at which it is intended to land, and at any alternate aerodrome, shall not exceed 70 per cent. of the landing distance available on the most suitable runway for a landing in still air conditions and also 70 per cent. of the landing distance available on the runway that may be required for landing because of the forecast wind conditions.
(11) For the purposes of sub-paragraph (10) the distance required to land from a height of 50 feet shall be taken to be that specified as being appropriate to—
(a) the landing weight;
(b) the altitude at the aerodrome;
(c) the temperature in the specified international standard atmosphere appropriate to the altitude at the aerodrome;
(d) a level surface in the case of runways usable in both directions or the average slope of the runway in the case of runways usable in only one direction; and
(e) still air conditions in the case of the most suitable runway for a landing in still air conditions and not more than 50 per cent. of the forecast wind component opposite to the direction of landing or not less than 150 per cent. of the forecast wind component in the direction of landing in the case of the runway that may be required for the landing because of the forecast wind conditions.

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Source: https://www.legislation.gov.uk/uksi/2005/1980/schedule/2/paragraph/3 (the official version)
Page: https://openlegislation.uk/air-navigation-general-regulations-2005/schedule-2/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.