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Aviation History
1997
1997 - 0029.PDF
AIR TRANSPORT neer Dan Mooney. The body extension is there fore achieved by extending section 43 (forward fuselage) aft by 4.06m and by stretching the aft body section 46 forward by 3.05m. "We're going to take the overwing exit body section [44], and combine it with a strengthened, four- door, section 46. This will allow us to meet die evacuation requirements without adding any new doors," he adds. The revised structure produces some large components. "Some of die fuselage panels end up as long as 400in [10.2 m]. That's single panels, which may present some handling challenges," says Mooney. Most of the body strengthening will be made to die overwing section 44, although some increases in skin and frame gauges will be made to sections 43 and 46. "The horizontal stabiliser will also be beefed up a bit," adds Mooney. The landing gear will be strengthened by removing less metal from the forgings, and the wheels will be fitted with 26- ply tyres to cope widi die heavier landing weight and associated higher landing speeds. Boeing estimates that touchdown speed will be around 140kt (260km/h) at maximum landing weight, or around 5kt higher for die larger aircraft. The nose gear will also be fitted with a spray deflec tor to ensure that the extended spray pattern of the longer airliner does not affect die engines. Local strengthening of die wing and engine pylon attachments is also planned. The pylon changes will be based on the strut modification now being implemented on the 757/767 line, to counter die discovery of some fatigue cracks in die current fleet. "The changes will incorporate this and will take account of die slightly higher strut loads that we expect. The strut will be basi cally strengthened to keep die fatigue life of the present unit," says Mooney. The 757-300 has been launched by Condor, with the 192kN (43,1001b)-thrust Rolls-Royce RB.211-535E4B. At a maximum take-off weight of 122,470kg, including 43,4901itres of fuel and 279 passengers, die charter-configured -300 will be just capable of flying from London to Bahrain in its design range of 5,090km. Popular tourist destinations in the Atlantic islands, the Mediterranean and North African areas are all within range. The -535E4B-pow- ered aircraft will also be able to be flown from New York to Los Angeles, or as far south as Quito, in this configuration. In a mixed-class configuration, seating around 240, die design range increases to 6,000km, increasing range capability to include New York to Paris, or London to Lagos. The Pratt & Whitney PW2043 engine, rated at 195kN, is being offered for die first time on the 757, says Mooney. The higher-thrust engine has been certificated (as the Fl 17-100) for the McDonnell Douglas (MDC) C-17, and provides slightly greater range capability widi a design range of 5,470km. This results from a slightly lower empty weight, because of the PW2000's lower installed weight, and reduced fuel consumption. Boeing says that die P& W- 0 2 5 10m ^ itl i H i ITI ifl 0 5 15ft 30ft TO oooooooSCgg _Q_ QQ_ Side and top elevations of the 751-300 powered 757-300, in charter configuration, will burn 18kg/passenger on a typical 920km mis sion, compared to 19kg/passenger for die iden tical R-R-powered aircraft. The extra range enables die PW2 043-charter version to reach the UK from New York and destinations as far east as Tashkent from London. In a mixed-class role, the PW-powered aircraft has a design range of 6,500km. SYSTEMS AND SOFTWARE Despite the simple-stretch philosophy, the sheer lengdi of the -300 has forced Boeing into certain systems changes. Others, such as the cabin interior and vacuum-lavatory system, have been introduced as state-of-the-art tech nical advances which have earned their way on to Boeing's odier new aircraft. The -300 will be fitted widi a version of die retractable tail-skid developed for die 767-300 and 777 to offset the potential for tail-strikes, which have affected die standard version. "Tail- strike is a concern," says Mooney, who adds tiiat tail-strike events on die -200 prompted some of die initiative. The tail-skid will be augmented by a body-contact sensor, which will alert the crew to a more serious contact on rotation or touchdown. The tail-strike indicator, as it • Boeing 757-300 changes from 757-200 Slregthen wing and engine strut - Stengthen overwing-exit body section 4m extension, section 43 New interior Revise systems for increased body length and gross weight Strengthen landing gear and wheels, new tyres and nose-gear spray deflector FLIGHT FLIGHT INTERNATIONAL 1 - 7 January 1997 27
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