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
The Bauhinia - (Based on the measured helicopter noise results at Harbour Commercial Building)
      S76C+    
Event LA LA w/o bk LA with Distance Correction Corrected LA with Screening effect Duration, s
Pass By (approach) 65.7 65.7 65.3 65.3 22
Approach 74.5 74.5 74.1 74.1 32
Hovering 77.5 77.5 77.1 77.1 30
Idling 67.4 67.4 67.0 67.0 668
Hovering 77.2 77.2 76.8 76.8 51
Take off 79.5 79.5 79.1 79.1 13
Pass By (away) 68.6 68.6 68.2 68.6 30
    846
Distance 213.0 (T1)
Corrected Distance 222.0  
Distance Correction -0.4  
     
Corrected Leq(helicopter) for a event = 70.5 (SPL1)  
     
No. of flights    
N = 8 (16 movements)**  
Leq(4-hour) = 67.3        
Note:
** existing flight frequency during 1900 to 2300