| Appendix 3.7b Calculation of Helicopter Noise
at the Proposed Helipad, Leq (4 hours) During 1900 - 2300 hrs |
| Mode
2 - Approach from West and Take off to East |
|
|
| Talon
Tower - (Based on the measured helicopter noise results at Wayson Commercial
Building) |
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| |
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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 |
|
| Pass By (approach) |
73.2 |
73.2 |
70.4 |
70.4 |
22 |
|
| Approach |
77.8 |
77.8 |
75.0 |
75.0 |
33 |
|
| Hovering |
79.3 |
79.3 |
76.5 |
76.5 |
30 |
|
| Idling |
61 |
61.0 |
58.2 |
58.2 |
673 |
|
| Hovering |
75.5 |
75.5 |
72.7 |
72.7 |
52 |
|
| Take off |
71.8 |
71.8 |
69.0 |
69.0 |
13 |
|
| Pass By (away) |
65.9 |
65.9 |
63.1 |
63.1 |
30 |
|
| |
|
853 |
|
| Background Level |
0.0 |
|
|
|
|
| Distance |
312.0 |
|
|
(T1) |
|
| Corrected Distance |
432.0 |
|
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| Distance Correction |
-2.8 |
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| Corrected Leq(helicopter)
for a event = |
66.9 |
|
(SPL1) |
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| No.
of flights |
|
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| N = |
11 |
|
(22 movements) |
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| Leq(4-hour)
= |
65.0 |
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