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
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