When does FAA issue airworthiness directives?

CFR · 2024-01-01 · US · Title 14

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.

official document · source cfr-2024 · id 14:§ 39.5