1. EXAMPLES SMALL HELICOPTERS NOISE FOOTPRINT ABOVE 62.5 dB THREE DIFFERENT ALTITUDES 1000’ AGL 1400’ AGL 2000’ AGL

2. Altitude (Distance) 1000’ Distance on the Ground = 1732’ or 1/3 Mile Distance – 2000’ Average Noise Levels on the Ground 69 dB* 62.5 dB HELICOPTER ASSOCIATION INTERNATIONAL (HAI) DISTANCE/NOISE RELATIONSHIP *HAI GENERAL RULE: IF THE DISTANCE IS HALVED, THE NOISE IS INCREASED 6-7 dB From Noise Tests AVERAGE HALF-FOOTPRINT OF NOISE ABOVE 62.5 dB Estimated 2

3. HELICOPTER AT 1000’ AGL – AVG FOOTPRINT NOISE ABOVE 62.5 dB– 2/3 MILE WIDE (At 60 dB noise begins to interfere with speech communication) Cut Corner Cut Corner Agreed Path 3 NOISE

4. Altitude (Distance) 1400 ‘ 66.4 dB Distance – 2000’ AVG HALF-FOOTPRINT 1428’ or 1/4 Mile 62.5 dB Average Noise Levels on the Ground From Noise Tests ROBINSON HELICOPTER CO. FLIGHTS AVERAGED 1400’ AGL. INCREASING THE ALTITUDE FROM 1000’ TO 1400’ REDUCES NOISE DIRECTLY BELOW AND REDUCES THE 62.5 dB FOOTPRINT FROM 1/3 MILE TO 1/4 MILE. RESULTS OF INCREASED ALTITUDE 4 Estimated

5. HELICOPTER AT 1400’ AGL – AVG FOOTPRINT NOISE ABOVE 62.5 dB – 1/2 MILE WIDE (At 60 dB noise begins to interfere with speech communication) Cut Corner Cut Corner Agreed Path 5 NOISE

6. Altitude (Distance) 2000’ 62.5 dB AT AN ALTITUDE (DISTANCE) OF 2000’ THE AVERAGE FOOTPRINT IS 6.52 dB DIRECTLY BELOW THE HELICOPTER. RESULTS OF INCREASING ALTITUDE 6 From Noise Tests

7. HELICOPTER AT 2000’ AGL – AVERAGE NOISE FOOTPRINT 62.5 dB 7 NOISE