a and b refer to the subject aircraft and the similar class aircraft,
skin thickness at x;
crush interface equivalent diameter at x;
crushing strength of the skin material.
C.18.104.22.168 Selection of Target SSCs, Angle, and Location of Impact.
The list of target SSCs need not include those that are protected by other structures at
the site that act as barriers against aircraft missiles. However, the list should include
SSCs that are not themselves safety-related, but whose failure may adversely affect
The angle and location of aircraft impact on the target shall be determined from the
Flight path of the aircraft and/or probability distribution of impact angle for the
aircraft subcategory (if available from Reference 1).
Location and orientation of the target relative to other structures at the site that
may act as effective barriers.
Potential for impact from a skidding aircraft.
Location of vibration-sensitive equipment or systems supported from the target.
Refer to Reference 2 for further discussion.