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ePaper created 2014-08-08, 11:09:35 | version 1.32.01
[Ú 08] [Ú 10] Yet more of the sub- stantially quieter Airbus A320neo aircraft for Lufthansa 10 The Lufthansa Group ordered 30 aircraft in the A320neo family on March 16, 2011 and another 70 such aircraft on March 13, 2013. 60 of these aircraft are equipped with PW1100G engines built by Pratt & Whitney, 40 others with LEAP-1A engines built by CFM International. These two engines are comparable in their flight performance and envi- ronmental compatibility values. For example, they reduce by half, according to their manufacturers’ specifications, the usual noise footprint produced by an aircraft when taking off or landing. This is a substantial reduction in the noise burden on residents of areas close to airports. Bombardier CSeries at Swiss: Audible reduction in the noise burden on residents of areas near airports 08 Swiss will be taking delivery of 30 CSeries aircraft from Bombardier, which will replace the Avro RJ100 regional aircraft currently in operation. The advent of this new generation of aircraft will bring a clearly audible improvement to the lives of those living near airports. The new aircraft, which are destined for service on European routes beginning sometime in 2015, are on average 10 to 15 decibels quieter than an Avro RJ100. According to the manufacturer information, the 60 dB maximum level contour of the CSeries has been reduced by 75% in comparison with its predecessor. Where noises are generated on an aircraft [Ú 09] The sound of an aircraft taking off is dominated by the noises produced by the engines. These emit noise both forwards and backwards. Airframe noise is caused by landing gear and control surfaces such as slats and flaps. These are important starting points for any project to develop new, quieter aircraft. Landing gear Control surfaces Engines Slats Turbine fan Flaps Jet Sustainability Report Balance // Issue 2014 // Lufthansa Group // 19