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Aviation History
1986
1986 - 0066.PDF
The qui The lowest achievable noise levels - both inter nally and externally - were among the fundamental design parameters of the British Aerospace Advanced Turboprop (ATP) airliner. The spacious, jet-style cabin is designed to have lower noise and vibration levels than any existing turboprop and comparable with those of the latest twin-jets. In terms of airport noise levels, ATP's 90 PNdB footprint is containable within the confines of an average mainline hub airport. With the first firm orders placed by two well estab lished airlines, British Midland Airways and LIAT (Leeward Islands Air Transport), construction of the first ATP is now well advanced and on schedule for first flight in 1986. Cabin quietness In propeller-driven aircraft, the prime source of noise is in the area of the propeller plane. In terms of passenger awareness to noise, ATP will be over 50% quieter than a typical current twin-turboprop in the propeller plane and some 40% quieter at the rear of the cabin. Anti-vibration mounts on the engine and internal trim, the use of underfloor noise absorption blankets and other equipment, and accurate synchro- phasing of the slow-turning, new-technology 6-bladed propellers will all combine to ensure lower vibration and noise levels.The aim: to achieve such standards of quiet, vibration-free cabin comfort that experienced jet travellers flying on ATP will never notice the difference! Airport quietness All current and proposed aircraft noise legislation was taken fully into account in the initial design of ATP so that there will be no need for hush-kitsor other modi fications. Compared with a current twin-turboprop, ATP will have a noise footprint of less than half the area and will equal that of the super-quiet BAe 146. For further information contact: British Aerospace, Woodford Aerodrome, Chester Road, Woodford, Cheshire, England, SK7 1QR. Tel: 061-439 5050 7e/ex 668939 INTERIOR NOISE rrasHarsmeBBBHBBiT r mgaaaaaagaagggaagi 94! 92 90 88 86 84 82 80 78 76 74 Typical cruise conditions Propeller ph Propeller plane 2 3 4 5 6 7 8 9 10 111213 14 15 16 Seat row Typical twin turboprop Typical twin jet ATP NOISE FOOTPRINT-90 PNdB Typical twin turboprop 1 Typical twin jet I ATP 30 25 20 15 10 5 Distance from start ol roll x 1.000 It — Take-off 1 H . 1 1 1 1 1 0 5 10 15 20 25 30 Distance from threshold x 1.000 fl •»-* Landing »•
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