Click here to make tpub.com your Home Page

Page Title: Table B-43. Helicopter Crash Frequency.
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 



DOE-STD-3014-96
APPENDIX B
The next step is to determine the impact frequency from intentional overflight of
helicopters. First, determine the number of operations. Earlier in the problem this was
defined as 365/y (or 1/day). Next, get the effective area from Table B-34. The
helicopter crash frequency is shown in Table B-43.
TABLE B-43. Helicopter Crash Frequency.
Average
Number of
Crash
A,
Length of
Frequency
Operations
Rate/Operation
Sq. Miles
Flight (mi)
Helicopter
365
2.5E-5
6.6E-4
37
3.3E-7
The next set of steps calculates the total impact frequency (see Section 5.3.3 of the
standard). The analyst begins by adding the near-airport and in-flight results for each
category/subcategory. The results are shown in Table B-44.
TABLE B-44. Total impact frequencies by category/subcategory.
Category/Subcategory
Impact Frequency (per year)
General Aviation
6.2E-6
Commercial Aviation Air Carrier
1.5E-7
Commercial Aviation Air Taxi
3.5E-7
Military Aviation Large Aircraft
6.4E-7
Military Aviation Small Aircraft
6.8E-7
Helicopters
3.3E-7
Total (all aircraft)
8.4E-6
Next, the analyst sums up the category/subcategory totals to find the total frequency of
aircraft impact into the facility. This equals 8.4E-6, so the facility does not pass the
impact frequency evaluation guideline in Section 4.2. Therefore, the analyst must
decide which categories to forward to the structural analyst.
B-48


Privacy Statement - Press Release - Copyright Information. - Contact Us