dixi188 I stand corrected on the methanol injection on the Spey. I am talking about EFAT during crew training at Hurn. I worked about 6 miles from Hurn and, when a 1-11 with one engine came overhead, it was still quite low and very loud. On at least one occasion, the largely female workers in an enclosed clean area panicked and started to rush out of the door.
Much later on, I was chatting to someone outside the BA Engineering Building at Heathrow and heard a similar noise from something taking off. Thinking it might be Concorde I rushed to a gap in the buildings where I had a glimpse of the runway. It was a 1-11 and,even with noise reduction kit, it had that ear splitting noise I used to hear so regularly at Hurn.