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(b) in the case of an aeroplane classified as an aeroplane of performance group D, be capable of continuing the flight to a point 1,000 feet above a place at which a safe landing can be made :
Provided that in assessing the ability of the aeroplane to satisfy this condition it shall not be assumed to be capable of flying at any point on its route at an altitude exceeding the per- formance ceiling with all power units operating ascertained by reference to the said flight manual as being appropriate to its estimated weight at that point.
(6) The weight of the aeroplane at the intended time of land- ing (hereinafter in this regulation called "the landing weight"), calculated by deducting the estimated weight of the fuel expected to be used on the fight from its weight at the commencement of the take-off run, will not exceed any of the maximum landing weights ascertained by reference to the said flight manual as being appropriate to the heights above mean sea level and the air temperatures forecast for the estimated time of landing at the aerodrome at which it is intended to land and at any alternate acrodrome.
(7) The landing distance, ascertained by reference to the said flight manual as being appropriate to-
(a) the landing weight;
(b) the height above mean sea level of the aerodrome;
(c) either the air temperature at the aerodrome forecast for the estimated time of landing or a temperature approved in respect of the aerodrome by the Director;
(d) still air conditions;
(e) the average slope of the surface of the aerodrome in the
direction of landing over the landing distance available;
does not exceed 70 per cent. of the landing distance available at the aerodrome at which it is intended to land or at any alternate aerodrome.
(8) The landing distance, ascertained by reference to the said flight manual as being appropriate to-
(a) the landing weight;
(b) the height above mean sea level of the aerodrome;
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(c) either the air temperature at the aerodrome forecast for the estimated time of landing or a temperature approved in respect of the aerodrome by the Director;
(4) not more than 50 per cent. of the forecast wind com- ponent opposite to the direction of landing or not more than 150 per cent. of the forecast wind component in the direction of landing ;
(e) the average slope of the surface of the aerodrome in the
direction of landing over the landing distance available;
does not exceed 70 per cent, of the landing distance available at the aerodrome at which it is intended to land or at any alternate aerodrome.
38. The assessment of the ability of an aeroplane, having a performance group classification in its certificate of airworthiness, to comply with regulation 36 or 37, shall be based on the informa- tion as to its performance contained in the flight manual relating to the aeroplane issued or rendered valid by the Director.
39. For the purposes of regulations 33, 34, 36 and 37- (4) the take-off run available means the distance from the point on the surface of the aerodrome at which the aero- plane can commence its take-off run to the nearest point in the direction of take-off at which the surface of the aerodrome is incapable of bearing the weight of the aero- plane under normal operating conditions;
(5) the take-off distance available means either the distance from the point on the surface of the aerodrome at which the aeroplane can commence its take-off run to the nearest obstacle in the direction of take-off projecting above the surface of the aerodrome and capable of affect- ing the safety of the aeroplane or twice the take-off run available, whichever is the less;
(c) the emergency distance available means the distance from the point on the surface of the aerodrome at which the aeroplane can commence its take-off run to the nearest point in the direction of take-off at which the aeroplane cannot rull over the surface of the aerodrome and be brought to rest in an emergency without risk of accident;