Noise monitoring at LGW
Many years ago:
I was busted for exceeding the permitted noise levels at LGW.
The formal letter arrived, and we were invited to the airport noise monitorint office at the airport, to explain why we exceeded the levels, and be prepared to pay the fine.
No quite sure why on PA28 (140, not even a 180) managed to exceed even a 1-11's scream, but the monitor man did laugh, and decided that our fine was cancelled.
As I understand it the monitor did not filter any frequencies, and our little puddle jumper had a spike in its audio spectrum.
Was also invited one day to discuss why we did not follow the SID / Min noise when operating between Gatport and Redhill.....
glf