FAA issues an airworthiness directive addressing a product when we find that:
(a) An unsafe condition exists in the product; and
(b) The condition is likely to exist or develop in other products of the same type design.
source: Docket No. FAA-2000-8460, 67 FR 48003, July 22, 2002, unless otherwise noted.
cite as: 14 CFR 39.5