| 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 |
|
|
| Talon
Tower - (Based on the measured helicopter noise results at Wayson Commercial
Building) |
|
|
|
| |
|
|
S76C+ |
|
|
|
| Event |
LA |
LA w/o
bk |
LA with Distance Correction |
Corrected LA
with Screening effect |
Duration, s |
|
| Pass By (approach) |
73.2 |
73.2 |
72.0 |
72.0 |
22 |
|
| Approach |
77.8 |
77.8 |
76.6 |
76.6 |
33 |
|
| Hovering |
79.3 |
79.3 |
78.1 |
78.1 |
30 |
|
| Idling |
61 |
61.0 |
59.8 |
59.8 |
673 |
|
| Hovering |
75.5 |
75.5 |
74.3 |
74.3 |
52 |
|
| Take off |
71.8 |
71.8 |
70.6 |
70.6 |
13 |
|
| Pass By (away) |
65.9 |
65.9 |
64.7 |
64.7 |
30 |
|
| |
|
853 |
|
| Background Level |
0.0 |
|
|
|
|
| Distance |
312.0 |
|
|
(T1) |
|
| Corrected Distance |
358.0 |
|
|
|
|
| Distance Correction |
-1.2 |
|
|
|
|
| |
|
|
|
| Corrected Leq(helicopter)
for a event = |
68.5 |
|
(SPL1) |
|
|
|
| |
|
|
|
| No.
of flights |
|
|
|
| N = |
11 |
|
(22 movements)** |
|
|
| Leq(4-hour)
= |
66.7 |
|
|
|
|
|
| Note: |
|
| **
current maximum allowable flight frequency during 1900 to 2300 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|