Abstract
The data I reported were from slow-response measurements, and EPNL values were derived using appropriate factors (for specific aircraft type, altitude, and operating conditions) determined from large samples of measurements obtained according to the FAR 36 certification method; hence the data were within normal tolerances of ±2 or 3 dB or EPNdB and were not subject to the 8- to 15-EPNdB error suggested by Callaway. My data were consistent with recent data published by other investigators. In regard to passenger cabin noise levels in commercial jet aircraft, measurements by myself and others show that during high-altitude cruise (28 000 to 35 000 feet) passengers near windows and in the mid and rear sections will be exposed to noise levels above 80 dBA.
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