SSC Functionality: As used in this standard, the function that a structure, system, or
component (SSC) performs to ensure that no significant threat to the general public (from
release of hazardous material) results from an aircraft crash accident.
Scabbing: A local damage that signifies the peeling off (or ejection) of material from the back
face of the target.
Scenario: A succession of specified events beginning with an initiating event, followed by other
events (such as failures of structures or systems), and ending with the release of hazardous
Secondary Missile: A part of the breakaway aircraft segments or a facility SSC (e.g., a
chimney structure) that becomes detached as a result of the impact of a primary missile on a
Spalling: A local damage that signifies the ejection of target material from the front face of the
Structures, Systems, and Components (SSCs): Buildings; building components (e.g., a roof
slab or wall); other structures (e.g., tanks, bunkers); mechanical or electrical systems (e.g., a
heating, ventilating, and air conditioning [HVAC] system or a cable-tray system); and mechanical
or electrical components or equipment (e.g., a motor control center or a pump). In this standard
it is generally used to refer to SSCs whose failure as a result of aircraft crash could result in a
release of hazardous material.
TACAN: Tactical Air Navigation, a military aviation navigational aid.
Takeoff Flight Phase: Refer to "Flight Phase" for definition.
Target: A facility, SSC, or other structure under evaluation that has the potential to be impacted
by an aircraft or aircraft-generated missile where such impact could ultimately lead to a release
of hazardous material.