ancientaviator62
Were those noise measurements conducted in 1994? If so I think you will find the team was from Farnborough ie DRA/IAM.
Regarding external noise levels and especially due to engine runs then they will inevitably lead to noise complaints. The problem is largely due to the tonal characteristics and unlike a departure the noise is present for much longer.
Has BZN looked at a large scale noise pen to conduct the engine runs. If you really want to control the noise then a large enclosure would suffice but I imagine it would be very expensive to build. Was there a facility such as this at Lyneham. I'm tempted to ask, as a civvy of course, why was Lyneham closed in the first place but that might be contentious.
BBK