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A-weighted airspeed amplifier APPENDIX approach flights APPROACHES AND LEVEL approaches with 40 bandwidth Bell and Howell Bruel & Kjaer Bruel and Kjaer CD CD CD center-line CM CM CM CM i-H data in table dB(A decibels deflection effective perceived noise engine pressure ratio EPNdB EPNL value extended center line flap settings flight-test data frequency response gear Howell Model i-H CM i-H i-H iiii Input impedance kg lb knots LA,max)ref LA,max)test Langley Research Center level flyover flight located max)ref maximum measuring station meteorological microphone mm/sec in./sec NASA noise data Noise measurements Nominal altitudes Output impedance parameters percent of full preamplifier preamplifier input procedures radar reference conditions Relative humidity root mean square runs shown in figure Sonde released sound pressure level specifications Tape speed test aircraft test conditions test data thrust Total harmonic distortion U.S. Customary Units unbalanced to ground voltage weight