BS EN 61265:1995(2000) Electroacoustics — Instruments for measurement of aircraft noise — Performance requirements for systems to measure one - third - octave band sound pressure levels in noise certification of transport - category aircraft
1995BS EN 61265:1995 Electroacoustics - Instruments for measurement of aircraft noise - Performance requirements for systems to measure one-third-octave band sound pressure levels in noise certification of transport-category aircraft