| Appendix 3.7a Calculation of Helicopter Noise
at the Existing Helipad, Leq (4 hours) During 1900 - 2300 hrs |
| Mode
1 - Approach from East and Take off to West |
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| Talon
Tower - (Based on the measured helicopter noise result 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 |
|
| Pass By (approach) |
68.0 |
68.0 |
66.8 |
66.8 |
49 |
|
| Approach |
71.1 |
71.1 |
69.9 |
69.9 |
25 |
|
| Hovering |
77.5 |
77.5 |
76.3 |
76.3 |
30 |
|
| Idling |
64.7 |
64.7 |
63.5 |
63.5 |
682 |
|
| Hovering |
73.3 |
73.3 |
72.1 |
72.1 |
59 |
|
| Take off |
78.1 |
78.1 |
76.9 |
76.9 |
12 |
|
| Pass By (away) |
78.3 |
78.3 |
77.1 |
77.1 |
12 |
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| |
|
869 |
|
| 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 = |
68.0 |
|
(SPL1) |
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| No.
of flights |
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| N = |
11 |
|
(22 movements)** |
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| Leq(4-hour)
= |
66.2 |
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| Note: |
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| **
current maximum allowable flight frequency during 1900 to 2300 |
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