Seat Primary Load Path – The components within the seat that carry the load from the
point of load application to the structure that reacts the load from the seat system or sub-
system. The primary load path may be segmented into its discrete elements, depending
on the parameter being evaluated, as follows:
Structural: from seat belt to fittings which attach the seat system to the airplane
structure.
Lumbar: from bottom cushion to fittings which attach the seat system to the
airplane structure.
Row-to Row Head Injury Criterion (HIC): from point of ATD head contact to the
attachment of seat primary structure.
Head Path (for example, front row or large pitch seats): same as structural. – AC 25.562-1B
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