Appendix 3.7a Calculation of Helicopter Noise
at the Existing Helipad, Leq (4 hours) During 1900 - 2300 hrs |
Mode
2 - Approach from West and Take off to East |
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Talon
Tower - (Based on the measured helicopter noise results at Wayson Commercial
Building) |
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S76C+ |
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Event |
LA |
LA w/o
bk |
LA with Distance Correction |
Corrected LA
with Screening effect |
Duration, s |
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Pass By (approach) |
73.2 |
73.2 |
72.0 |
72.0 |
22 |
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Approach |
77.8 |
77.8 |
76.6 |
76.6 |
33 |
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Hovering |
79.3 |
79.3 |
78.1 |
78.1 |
30 |
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Idling |
61 |
61.0 |
59.8 |
59.8 |
673 |
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Hovering |
75.5 |
75.5 |
74.3 |
74.3 |
52 |
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Take off |
71.8 |
71.8 |
70.6 |
70.6 |
13 |
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Pass By (away) |
65.9 |
65.9 |
64.7 |
64.7 |
30 |
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853 |
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Background Level |
0.0 |
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Distance |
312.0 |
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(T1) |
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Corrected Distance |
358.0 |
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Distance Correction |
-1.2 |
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Corrected Leq(helicopter)
for a event = |
68.5 |
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(SPL1) |
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No.
of flights |
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N = |
8 |
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(16 movements)** |
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Leq(4-hour)
= |
65.3 |
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Note: |
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** existing flight frequency
during 1900 to 2300 |
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