missiles (Reference 1). For evaluating SSC functionality
(discussed in detail in Section 6.3.4), in addition to the kinetic
energy of the impacting aircraft, the mass and stiffness
characteristics of the missiles should also be considered
because these are likely to affect the frequency content of the
vibration resulting from the impact.
For evaluating local response, the selection of critical missiles
should be based on the postulated aircraft impact velocity and
the relative sizes and weights of the heaviest rigid-type
components, considering all candidate aircraft subcategories.
Consideration should also be given to the mode of local
damage (see Section 6.3.2). One aircraft component may not
be critical for all modes of local damage. Also, for each mode
of local damage, more than one missile may need to be
selected unless one particular missile's combination of
velocity, size, and weight is clearly more critical than that of
other candidate missiles.
A representative weight and velocity for the aircraft in each
subcategory should be established based on the review of
aircraft subcategory data in the Data Development Technical
Methodology Standard (Reference 2) and the results of the
site-specific hazard study performed in accordance with the
guidance given in Chapter 5 of this standard. The analyst
should consider the representative aircraft weights and
velocities associated with both takeoff and landing scenarios.
Mass distribution of the aircraft along the length of the
fuselage can be obtained from Reference 2, from the aircraft
manufacturer, or by calculation based on the weights and