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. � • <br /> � . <br /> 52 Fly Neighborly Guide <br /> What do these noise levels mean? The following table provides some basis for <br /> comparison between the helicopter noise in the figures above, and other, familiar noises. <br /> � <br /> Table 1. Illi�str•ative Noises <br /> Home or Industry Human Judgment <br /> d8(A) Overall Level Community(Outdoo�) (Indoor) of Loudness <br /> j military jet aircraft ' <br /> uncomfo�tably loud takeoff�from aircraft <br />� 130 carrier at 50 ft(130) <br /> t 120 d6(A) <br />; 120 oxygen torch(121) 32 times as loud <br /> turbofan aircraft at riveting machine (110) <br />�k very loud takeoff power at 200 ft rock-and-roll band 110 dB(A) <br />` 110 (118) (108-114) 16 times as loud <br />'w , jet flyover at 1000 ft 100 dB(A) <br />'I ► 100 (103) 8 times as loud <br /> power mowe�(95) newspaper press (97) 90 d6(A) <br /> 90 motorcycle at 25 ft (90) 4 times as loud <br />' car wash at 20 ft (89) food blender (88) <br /> moderately Ioud diesel truck at 40 mph at milling machine (85) <br /> 80 50 ft(84) - garbage disposal (80) <br /> high urban ambient 80 d6(A) <br /> sound (80) twice as loud <br /> passenger car at living room music(76) Relerence <br /> 65 mph at 25 ft (77) TV audio,vacuum <br /> 70 cleaner (70) 70 dB(A) <br /> electric typewriter at 10 <br /> air conditioning unit at ft(64) <br /> 60 100 ft (60) dishwasher(rinse) at 10 <br /> - ft (60) 60 d8(A) <br /> conversation (60) tii/2 as loud <br /> quiet large transformers at 50 dB(A) <br /> 50 100 ft (50) 1/4 as loud <br /> bird calls (44) <br /> ' lower limit of urban 40 dB(A) <br /> 40 ambient sound (40) 1/8 as loud <br /> 10 just audible d6(A) scale interrupted <br /> � threshold of <br /> hearing <br />