HC Deb 29 June 1960 vol 625 c132W
66. Mr. Brockway

asked the Minister of Aviation what effect on the reduction of noise was shown in the tests of muffling the engines of a British Overseas Airways Corporation's Boeing 707 airliner at London Airport on 15th June and subsequently.

Mr. Sandys

The analysis of the sound recording made at London Airport on 11th June has not yet been completed.