FAA Federal Aviation Regulations (FARS, 14 CFR)

Upon the request of the Administrator, each manufacturer of an article under a TSO authorization shall allow the Administrator to --

(a) Inspect any article manufactured under that authorization;

(b) Inspect the manufacturer's quality control system;

(c) Witness any tests;

(d) Inspect the manufacturing facilities; and

(e) Inspect the technical data files on that article.