66 and 67. Mr. Gresham Cookeasked the Minister of Aviation (1) how soon he expects silencers or suppressors to be 11W fitted to the majority of petrol-engined aircraft operating from London Airport;
(2) in view of the reduction in the noise of jet engines achieved by the fitting of suppressors to the Comet 4 and the Boeing 707, whether he will require all jet aircraft operating from London Airport to fit such suppressors.
§ Mr. SandysMost of the noise of large piston-engined aircraft is made by the propellers and could not be materially reduced by the fitting of suppressors. Suppressors can significantly reduce the noise of jet engines and most jet aircraft are already fitted with them, or will soon be fitted.