§ Mr. Adleyasked the Secretary of State for Trade and Industry what is the noise, in estimated perceived noise decibels of fly-over and approach, at the Standard Federal Aviation Administration (Federal Aviation Regulation Part 36) positions, at three nautical miles on fly-over, and one nautical mile on approach of a DC8–50, a VC10, a Boeing 707–320B, a Trident 3B and Concorde.
§ Mr. NobleThe noise levels are as follows:
Fly-over Approach EPndB DC8–50 … 115 117 VC10 … 110 115 Boeing 707–320B … 113 120 Trident 3B … 104 110 The fly-over point is 3.5 nautical miles not 3 miles. The two British subsonic aircraft have not been measured under FAR 36 conditions but the manufacturers have estimated the figures from measurements made under other conditions. Concorde's design aim is to have noise levels comparable to these aircraft. A programme of research is under way to this end. Precise forecasts cannot be made until this work has proceeded further.