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Aviation History
1970
1970 - 1562.PDF
232 FLIGHT International, 13 August 1970 COMMERCIAL & BUSINESS Safe Circulars Three recent Aeronautical Information Circulars have been designated as having a specific flight safety slant. No 61/1970 discusses the practice of • reporting altimeter pressure settings to the nearest half millibar. The Board of Trade recommend that for the purpose of in-flight altimeter setting, pilots should round down half-millibar settings to the nearest whole millibar. The risk of R/T misunderstandings is also highlighted and the Board of Trade say that it is their intention to have the half millibar procedure reviewed at Icao as soon as opportunity arises. Circular No 64/1970 amplifies earlier warnings about tur bulence behind the Boeing 747. Tests have shown that the 10- mile separation standard is not warranted and normal separa tion (i.e., 5 miles) will be applied in future by air traffic control. Pilots are warned to apply the same separation in the event of passing behind a Boeing 747 outside controlled airspace and at the same height or within 1,000ft below. Circular No 62/1970 provides guidance on the operation of helicopters with external loads. The circular is comprehensive and discusses problems of loading and lifting, route planning, electrical static charges, oscillation and the use of hand signals with particular reference to their use by persons (e.g., crane crews) familiar with a different convention of signals. The signals to be used when marshalling helicopters are reprinted in the circular. Temporary London "Helistop" A temporary "helistop" for a limited number of helicopter movements in St Katharine Docks. Tower Hamlets, has been agreed by the Central Area Board of the Greater London Council's Environmental Plan ning Committee. The site is on the East Quay of the docks. Conditions of the The Swearingen Merlin III for which FAA type certification was granted on July 27 The first flight of the Rolls-Royce Viper 600 was made in a BH-125 flying test bed from Filton on August 3. The engine is being developed jointly ( with Fiat and it will be offered for civil business-jet or military trainer applications i I I temporary tenancy require that not more than 30 movements— that is 15 aircraft taking off and landing—are made each day , during the week September 7-13 (Farnborough week) and only 20 movements—or 10 aircraft—a day during the remaining r period. The use can take place for 28 days without planning permission. f Mr Neil O. Thorne, chairman of the board, said recently: "The site will be restricted to use by only the quieter type of i helicopters available—the Bell JetRanger and the Hiller U-12. This experiment will give us practical experience of the effects ' of helicopter operation and enable us to carry out a noise and social survey in the locality, thereby gaining information which ' will be extremely valuable when we consider future heliports or Vtol terminals. At no time will the helicopters fly over any houses in the area. They will go directly out to and from their flight path over the river." Swearingen Certification FAA type certification was awarded to the Swearingen Merlin III on July 27. The eight-seat series III is powered by two Garrett AiResearch TPE 331 turbo- props. A disposable load of 4,9751b allows a high degree of flexibility in payload/range planning and with a 71b/sq in cabin differential the cruise can be planned at anjTlevel up to 28,000ft. At this'height the cruising speed is 296 m.p.h. and the maximum range with reserves is 2.710 miles. Geophysical Twin Otter International Nickel has purchased a second de Havilland Canada Twin Otter for use by its Cana dian-based exploration division at Sudbury, Ontario. Inter national Nickel was the first company to acquire a Twin Otter for geophysical survey work in 1967, and the combination of the aircraft's low-speed handling characteristics and the Inco-developed survey system has proved highly effective. Inco experts worked closely with de Havilland engineers to design an installation which would reduce interference with the electromagnetic equipment caused by the metal airframe. In the final design, which has proved highly successful and will be used on the second aircraft, the transmitter coils are contained in a wooden tripod structure mounted on top of the aircraft. The back portion of the longitudinal coil is embedded in the leading edge of the fin which was reconstructed of glass fibre. A glass-fibre bomb-shaped vehicle, also containing survey equipment, can be lowered from the Twin Otter by winch on a 500ft rubber-covered steel cable to be towed at 120 m.p.h.
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