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App. G

APPENDIX G EXTRACT FROM UNITED KINGDOM DRAFT REGULATIONS GOVERNING AIRCRAFT PERFORMANCE (Vide Chapter 17) 5. A public transport or an aerial work aeroplane shall not fly or attempt to fly unless : (1) The weight of the aeroplane immediately before the commencement of the proposed flight is such that one of the following conditions is complied with — (a) The wing loading of the aeroplane, as certified by the Board, shall not exceed 20 lbs. per square foot; or (b) The stalling speed of the aeroplane in the landing configuration, as certified by the Board, shall not exceed 60 knots ; or (c) The aeroplane, with any one of its engines inoperative and the remaining engines developing maximum continuous power, shall have a positive rate of climb, as certified by the Board, at an altitude of 5,000 feet above sea level in conditions of standard atmosphere ; and (2) The person in command of the aeroplane has satisfied himself that the surface of the landing strip from which the flying machine is about to take off at the aerodrome of departure is capable of satisfactorily supporting the weight of the aeroplane for the take-off, and that the distance estimated to be required for the take-off under the conditions prevailing at that time does not exceed the length of the said landing strip ; and (3) Having regard to the best information available to him at the time of the start of the proposed flight as to the conditions likely to prevail at the aerodrome of destination when the aeroplane arrives there, the person in command of the aeroplane has satisfied himself that the surface of any landing strip which may be used for the landing will be capable of satisfactorily supporting the weight of the aeroplane at the time of such landing, and that the distance estimated to ,be required for the landing, under the conditions expected to prevail 1 at that time, does not exceed 70 per cent, of the length of any such landing strip. Provided that, where a visual approach and landing is expected to be made, this may be increased to 80 per cent, of the landing strip. For the purpose of so satisfying himself the person in command of the aeroplane shall proceed on the following assumptions as to the conditions of wind which may prevail at the aerodrome of destination at the time he expects to arrive there : (a) That conditions of still air will prevail and that the landing will accordingly be made on the most suitable landing strip available for use under those conditions ; and (b) That other conditions of wind, such as may reasonably be expected, will prevail, and that the landing will necessarily have to be made on any of the available landing strips other than that most suitable for landing in conditions of still air.