PGI 225.770-1 Definitions.
In accordance with 22 CFR 121.8—
(1) A major component includes any assembled element that forms a portion of an end item without which the end item is inoperable. Examples of major components are airframes, tail sections, transmissions, tank treads, and hulls;
(2) A minor component includes any assembled element of a major component; and
(3) Examples of parts are rivets, wires, and bolts.