§ Sir G. Sinclairasked the Minister of Aviation, in view of the increasing noise from jet aircraft at Gatwick Airport, how many sets of mufflers are currently employed at London Airport to reduce noise when testing jet engines and how many are now employed at Gatwick; and whether he is satisfied that the companies operating from Gatwick are making the fullest possible use of these devices to reduce noise.
§ Mr. Roy JenkinsSeven sets of mufflers are currently employed at Heathrow and none at Gatwick. Two sets of88W mufflers were installed at Gatwick five months ago but proved unsatisfactory on test. The modified type is expected to go on test in about four weeks' time. We shall insist upon a full use of these devices when they have been made satisfactory.