The Day-Night Noise Level, which takes tonal content, duration, and number of operations into account, and penalizes night-time noise, is found to be the best available index for rating community annoyance caused by aircraft. A Day-Night level of 60 for communities with ambient noise levels up to 58 dBA, and a level of 2 dBA higher than the ambient for communities where it is above 58 dBA, is proposed as acceptable. Evaluation of a large transport helicopter showed that the guidelines do not impose severe economic penalties on helicopter operations.


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    Title :

    A study of noise guidelines for community acceptance of civil-helicopter operations


    Contributors:


    Publication date :

    1975-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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