§ 70. Mr. Sandelsonasked the Secretary of State for Trade and Industry if he will make a statement on the estimated figures for the noise of the production version of Concorde given in the 1971
90Wjuries caused by fireworks during the period 17th October to 13th November, 1971, compared with 49 in the corresponding period in 1970 and 90 in 1969. Detailed information is given below.
Annual Report of the British Airports Authority; and as these figures, being EPNdB figures, do not permit comparison with PNdB figures by which aircraft noise is measured at airports, whether he will provide in the Library full diagrammatic contours of the area of land expected to be subject to noise of 80 PNdB, 90 PNdB, and above, respectively, by Concorde on take-off and landing at full operational weights.
§ Mr. CorfieldThe levels given in the 1970–71 Report of the British Airports Authority are derived from the target levels for Concorde's entry into service, which are given in EPNdB to enable comparison to be made with the certification requirements for subsonic aircraft. Provided these levels can be met Concorde is expected also to meet the current day-time noise limit at Heathrow. Until noise measurements have been taken on the production aircraft and silencers it would be premature to try to estimate detailed noise contours, but in operations based on Heathrow the noise on take-off and landing as measured in PNdB, is expected to be comparable with the Boeing 707/VC 10 aircraft.