locations of major components and fuel, which can be
obtained from published literature on the same type of aircraft.
The variation of load capacity due to fuselage buckling or
crushing (whichever is lower) as the crushing length
progresses from the aircraft nose toward the rear can be
obtained from the manufacturer or calculated using pertinent
data from published literature on the same type of aircraft.
When an aircraft impacts a target, the potential for damage
from secondary missiles should be considered in order to
evaluate the adequacies of safety-related SSCs in the vicinity
of the primary impact area.
The velocity of the secondary missiles at the instant of
detachment from the main body of the aircraft can be
calculated by methods that are well established in the
industry, such as the method developed by Riera
(Reference 3). Alternatively, it should be conservative to
assume that the initial velocity of such secondary aircraft
missiles is equal to the impact velocity of the primary aircraft
Selection of Target SSCs, Angle, and Location of Impact.
a. The list of target SSCs and their barriers that should be evaluated for
adverse effects (listed in Section 6.1.1) from aircraft missile impacts
can be based on available facility safety analyses. The selection of
these targets is a joint activity of the structural engineer and the
facility safety analyst. Using insights derived from any existing safety
analysis, the safety analyst should provide the structural engineer with
lists of potential targets whose failure could lead to the release of