We use necessary cookies to make our website work. We'd also like to use optional cookies to understand how you use it, and to help us improve it.

For more information, please read our cookie policy.

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 paper presents a short review of the Noise and Number Index (NNI), covering its origin and applications, its basis and limitations, the research which has been done upon it and a comparison with other indices. The opportunity is taken to explain in the course of the discussion those points which have been the most frequent sources of difficulty. It is hoped that this will contribute to a wider understanding of the nature of the Index and of its relevance and validity in the many different circumstances in which it may be used.

[This second edition incorporates the corrigenda and addendum published subsequent to the first edition. In Annex 1 there are also textual changes relating to the changed situation since the publication of the first edition.]
Status:
Current
Review comment:
-
Version:
1
Version date:
01-Sep-1981
View file:

This publication features in the following categories.

This publication features in the following series.