altitudes and the expected air temperatures for the estimated times of landing at the aerodrome at which it is intended to land and at any alternate aerodrome.
(7) The landing distance required, ascertained by reference to the said flight manual as being appropriate to an aerodrome of destination and to an alternate aerodrome, and to-
(a) the landing weight:
(6) the altitude at the aerodrome;
(c) the standard temperature appropriate to the elevation of
the aerodrome:
(d) still air conditions; and
(e)
(i) a level surface in the case of runways usable in both directions;
(ii) the average slope of the runway in the case runways usable in only one direction.
does not at the aerodrome at which it is intended to land or at any alternate aerodrome, as the case may be, exceed the landing distance available on the most suitable runway for a landing in still air.
(8) The landing distance required, ascertained by reference to the said flight manual as being appropriate to an aerodrome of destination and to an alternate aerodrome, and to
(a) the landing weight;
(b) the altitude at the aerodrome;
(c) the standard temperature appropriate to the elevation of i
the aerodrome:
(d) 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; and
(e)
() a level surface in the case of runways usable in both directions;
(i) the average slope of the runway in the case of runways usable in only one direction,
does not at the aerodrome at which it is intended to land of any alternate aerodrome, as the case may be, exceed the landing distance available on the runway that may be required for landing because of the expected wind conditions:
Provided that if an alternate aerodrome is designated in the Right plan, the landing distance required, ascertained by reference to the said flight manual, may be that appropriate to an altemate aerodrome.".
4.
Regulation 37 of the principal regulations is amended- (a) by the addition after the figures "37" of the following-
*0)":
(6) by the deletion in paragraph (d) of condition (8) of the words and figures "not more than 150 per cent" and the substitution therefor of the following-
"not less than 150 per cent"; and
(c) by the addition at the end thereof of the following-
"(2) An aeroplane classified as aforesaid as an aeroplane of performance group D shall not fly or attempt to fly at night or when the cloud ceiling or visibility prevailing at the aerodrome of departure and forecast for the estimated time of landing at the aerodrome of destina- tion and at any alternate aerodrome are less than 1,000 feet and one mile respectively.".
Amendment
of regula tips 37.
5. The principal regulations are amended by the addition after Addition of regulation 37 of the following-
"Requirements as to the weight and performance of public transport aeroplanes classified as aeroplanes of performance group X in their
certificates of airworthiness.
37A. With reference to Article 17(4) of the Order a public transport aeroplane classified in the certificate of airworthiness relating to the aeroplane issued or rendered valid by the Director as an aeroplane of performance group X shall not fly or attempt to fly unless the weight of the aeroplane at the commencement of the take-off run is such that the following conditions are satisfied-
(1) (1) The weight of the aeroplane at the commencement of the take-off run does not exceed the weight specified in the flight manual issued or rendered valid by the Director for the type of aeroplane as being the maximum take-off weight appropriate either to the altitude of the aerodrome at which the take-off is to be made, or to the altitude and the air temperature at such aerodrome, as the case may be. (ii) The minimum effective take-off runway distance, specified in the said flight manual relating to the aeroplane as being appropriate to---
(a) the weight of the aeroplane at the commencement of
the take-off run:
(b) the altitude of the aerodrome;
(c) the air temperature at the time of take-off;
(d) the overall gradient of the take-off run available; and
new regula- Lions 37A and 378.