Missile and Target Selection.
Selection and Characterization of Critical Missiles.
Aircraft subcategories identified in the site-specific hazard
study (see Chapter 5) should be considered as sources of
missiles for the facility being evaluated. The mass, velocity,
and stiffness characteristics and configuration of these aircraft
subcategories and their major heavy and rigid components
should be used to select the critical missiles.
Nondeformable missiles are the rigid and heavy components
(e.g., landing gear, engine shaft) of the aircraft. Deformable
missiles are relatively soft components (e.g., wings, fuselage).
As evidenced in some recent tests, aircraft engines deform
significantly upon impact with rigid barriers and hence can be
considered as deformable. Critical missiles should be
selected by considering the three adverse effects listed in
Section 6.1.1. The local damage evaluation should be
performed using relatively nondeformable components of the
aircraft as the candidate missiles. Typically, the aircraft as a
whole is critical for global response evaluation. For SSC
functionality evaluation, the whole aircraft and its rigid and
heavy components can be critical.
In selecting critical missiles, consideration should also be
given to the relative location, orientation, and configuration of
SSCs and their barriers at the facility.
When more than one missile can potentially impact a target,
select the missile with the maximum kinetic energy as the
critical missile for global response evaluation. For local
response, also consider the penetration characteristics of the