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DOE-STD-3014-96
2. Commercial Aviation Air Taxi.
Step 11. Refer to Appendix B, Table B-15, and obtain the appropriate site-specific or
generic value for NPf(x,y).
Step 12. Multiply the value NPf(x,y) by the A value determined for air taxis in Step 5.
3. Large Military Aviation.
Step 13. Refer to Appendix B, Table B-15, and obtain the appropriate site-specific or
generic value for NPf(x,y).
Step 14. Multiply the value NPf(x,y) by the takeoff effective area value, A, determined for
large military takeoff in Step 5. The takeoff effective area, A, is used because it more
closely represents in-flight crashes.
4. Small Military Aviation.
Step 15. Refer to Appendix B, Table B-15, and obtain the appropriate site-specific or
generic value for NPf(x,y).
Step 16. Multiply the value NPf(x,y) by the takeoff effective area value, A, determined for
small military takeoff in Step 5. The takeoff effective area, A, is used because it more
closely represents in-flight crashes.
c.
Helicopter Aviation. Based on an analysis of historical helicopter crash
data, the contribution to impact frequencies associated with nonlocal
helicopter overflights is insignificant and need not be considered in the
impact frequency calculations. However, it is necessary to consider
local overflights, either planned overflights associated with the facility
operations, e.g., security flights, or flights associated with area
operations, e.g., spraying flights. Thus, the calculation of in-flight
helicopter impact frequencies is a site-specific calculation. For
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