11.13  perceived noise level. Frequency-weighted sound pressure level obtained by a stated procedure that combines the sound pressure levels in the 24 one-third octave bands with midband frequencies from 50 Hz to 10 kHz. Unit, decibel (dB); abbreviation, PNL; symbol, LPN.

Annotation              Procedures for computing perceived noise level are stated in International Civil Aviation Organization, ICAO 9501, Environmental Technical Manual on the Use of Procedures in the Noise Certification of Aircraft, Third Edition, 2004.

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