Noise measurements on the AGUSTA 109A helicopter were performed in order to determine the effective perceived noise levels (EPNL) in compliance with proposed regulations; investigate flight altitude effects on EPNL; and evaluate the effect of different takeoff power settings on EPNL. EPNL values for operational modes are close to the proposed noise limits. For takeoff and approach the EPNL values are 1 EPNdb below, for flyover 1.6 EPNdb above the noise limits. After applying the tradeoff regulation, the A 109A complies with the proposed noise certification rules. A possible uncertainty in the measured takeoff values may result from a significant airspeed excess at the takeoff test flights. Unfavorable wind conditions with mean velocities up to 9 knots possibly affected the approach results. Noise measurements under more favorable weather and test conditions are recommended.


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    Title :

    Acoustic Evaluation of the Agusta 109A Helicopter in Compliance with the Proposed Icao Annex 16/Chapter 8 Regulations


    Contributors:

    Publication date :

    1981


    Size :

    122 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English