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UK Civil Aviation Regulations

These are published by the CAA on our UK Regulations pages. EU Regulations and EASA Access Guides published by EASA no longer apply in the UK. Our website and publications are being reviewed to update all references. Any references to EU law and EASA Access guides should be disregarded and where applicable the equivalent UK versions referred to instead.

This document describes the basis of the computer model currently used by the CAA to generate contour maps of aircraft noise exposure level around airports. Developed from the earlier Noise and Number Index (NNI) model, this now produces contours of Equivalent Continuous Sound Level (Leq) in dB(A). The main difference between the procedures used to compute these two noise indices lies in the algorithms for calculating single-event levels. A detailed comparison of these accompanies a general description of the method by which index values are computed and turned into contours. The sources of input data and likely future developments are also considered.
Status:
Current
Review comment:
-
Version:
1
Version date:
01-Nov-1992
View file:

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