The Air Navigation (General) (Second Amendment) Regulations 1987
These Regulations amend the Air Navigation (General) Regulations 1981. The principal changes are:A notional male passenger weight of 83 kg. is introduced for United Kingdom based helicopters involved in support of or in connection with the offshore exploitation of or exploration for mineral resources (including gas) (regulation 2(1)).The maximum semi-width of the obstacle clearance area after take-off is reduced from 1500 to 900 metres (regulation 2(2), (5), (6) and (8)).Any twin-engined public transport aeroplane in performance group A of more than 5700 kg. certificated to carry 20 or more passengers, shall at no time during a flight be more than 60 minutes flying time at its one engine inoperative cruise speed from the nearest suitable alternate aerodrome, unless it is flying in accordance with the terms of a written permission from the Authority and any twin engined public transport aircraft in performance group A of less than 5700 kg. or certificated to carry less than 20 passengers shall at no time during a flight be more than 90 minutes flying time at its one engine inoperative cruise speed from the nearest suitable alternate aerodrome (regulation 2(3)).It is made clear that the proviso to regulation 7(7)(a) applies only to sub-paragraph (ii) of that regulation so that the landing distance required must not exceed the distance available on the runway most suitable for landing in still air conditions at both the aerodrome of destination and any alternative aerodrome (regulation 2(4)).The boundary of the airspace in which minimum navigation performance requirements apply is amended to include airspace in the New York Oceanic Control Area to the Western Boundary north of 38° 30'N and in the Reykjavik Oceanic Control Area to the North Pole (regulation 2(7)).