Table B-17. Values of the mean of the cotangent of the impact angle (cot ).
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DOE-STD-3014-96
APPENDIX B
TABLE B-17. Values of the mean of the cotangent of the impact angle (cot ).
Military Aviation
Aircraft
Commercial
General
Helicopters
Large Aircraft
Small Aircraft
Category
Aviation
Aviation
Takeoff
Landing
Takeoff
Landing
Mean
10.2
8.2
0.58
7.4
9.7
8.4
10.4
(cot )
TABLE B-18. Mean skid distances (s) for each aircraft category.
Aircraft
Commercial
General
Military Aviation
Category
Aviation
Aviation
Helicopters
Large Aircraft
Small Aircraft
Takeoff
Landing
Takeoff
Landing
Mean Skid
1440
60
0
780
368
246
447
Distance, ft
In calculating an effective area, the analyst needs to be cognizant of the "critical areas"
of the facility. Critical areas are locations in a facility that contain hazardous material
and/or locations that, once impacted by a crash, can lead to cascading failures, e.g., a
fire, collapse, and/or explosion that would impact the hazardous material. This
knowledge is important for reducing the unnecessary conservatism that is likely to be
introduced if the facility's dimensions are used blindly. For example, if the critical area
dimensions are small fractions of the overall facility dimensions, this must be reflected
in the analysis. In addition, the analyst needs to consider the facility's layout and its
location in relation to other facilities when determining the facility input parameters.
Information about critical areas and potential aircraft heading angles may eliminate or
change the need for further analysis. Otherwise, the conservatism in the analysis
might unnecessarily overburden the evaluations.
In addition, there may exist conditions and physical attributes that could affect the
evaluation of the effective target areas. For example, there could be nearby barriers
that have sufficient structural integrity to resist impact from the categories (or
subcategories) of aircraft under investigation. Examples of barriers are robust
B-29

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