General Aviation.

DOE-STD-3014-96

The analysis of the nonairport operations impact frequency for all categories of

aircraft is based on the same four-factor formula (Equation 5-1) as is used for

airport operations; i.e., the frequency, Fj, for the class of aircraft, j, is

fj (x,y)

(5-2)

where the product NP represents the expected number of in-flight crashes per

year; f(x,y) is the probability, given a crash, that the crash occurs in a

1-square-mile area surrounding the facility of interest; and A is the effective area

of the facility. Ideally, values for NP and f(x,y) would be provided for any location

within the continental United States (CONUS), similar to those provided for airport

operations. However, this is impractical because of the large area of the CONUS.

For this standard, values of the product NPf(x,y) applicable to selected DOE sites

are provided in Tables B-14 and B-15. Also included are minimum, U.S. average,

and maximum values, which can be used for facilities at other locations within the

CONUS, for each category of aircraft.

Development of the values in the tables is based on an analysis of the locations of

past aircraft crashes within the CONUS. For general aviation, this record is

substantial (over 1000 crashes) while the available data for other aircraft

categories/subcategories, e.g., air carrier and large military, are very limited.

Discussion of the bases of the values in Tables B-14 and B-15 and an outline of

the analysis steps follow.

General Aviation. The distribution of general aviation (GA) aircraft

crashes throughout the CONUS is based on GA aircraft flying under both

VFR and IFR conditions. Except for certain restrictions, e.g., restricted

airspace, a GA aircraft can fly almost anywhere in the CONUS. In

addition, once an in-flight mishap does occur, with an eventual loss of

control, there is nothing to prevent a disabled aircraft from crashing into

any location, even within a restricted airspace area. Thus, it is