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Aviation History
1975
1975 - 0962.PDF
FLIGHT Internationa/, 2? May I97S business-jet plans Of the three leading business-jet manufacturers Dassault will show a full-sized mock-up of the Falcon 50, planned for first deliveries in 1978; Gates Learjet has begun deliveries to Europe of its 35/36 turbofan models with sales in Germany and Spain, below; and Beechcraft-Hawker has delivered the first HS.125-600 with silencing modifications, seen on the latest demonstration aircraft to be completed by Hawker Siddeley, bottom veloped a multi-lobe tailpipe which has reduced the noise to the requirements of FAR Part 36. Hawker Siddeley has put a lot of development effort into silencing the HS.125-600 and aircraft for the American market comply with the noise regulations. The extended tailpipe, which will be seen on the demonstration aircraft at the show, is optional on aircraft for European customers and is available for retrofitting. Compliance with FAR Part 36 has been achieved with only a marginal loss of cruise performance. Aerospatiale will show the Corvette, which has found favour with French third-level operators but has not yet penetrated the American business market because of difficulties which arose with the maker's representation there. Sales are expected to harden when locally com pleted demonstration aircraft are available. The United Aircraft of Canada JT15D turbofan, which the Corvette shares with the Cessna Citation, is proving in service to offer reliability as well as an exceptionally low noise level. There have been instances of airfields which operate a night ban on jet aircraft permitting the Citation to con tinue flying because of its relative silence. Neither Aerospatiale nor Cessna is expected to show any major change to its models; plans to develop stretched Corvettes, announced at Paris in 1973, appear to have foundered for lack of funds while Cessna is unlikely to reveal new details of its three-engined Citation 700 project. The Rockwell Sabre 75A differs from earlier models seen at Paris in having General Electric CF700 turbofans equipped with thrust reversers. The aircraft is being bought by the Federal Aviation Administration for calibration of navigation aids and is the prime contender for re-equipping the US Coastguard service. As we close for press there is no confirmation of the appearance at the show of either the Gulfstream 2 or the JetStar 2. Grumman has successfully overcome the prob lem of combining a multi-lobe tailpipe with a thrust re- verser in order to silence the Speys and has met the constraints of FAR Part 36 without performance penalty. Lockheed had virtually closed the production line of the JetStar but the design has been given a new life by the installation of Garrett TFE731 turbofans under the sponsorship of AiResearch Aviation. The revised aircraft offers a much increased range and a low noise level.
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