StacksVerified U.S. regulatory reference

14 CFR §21.8

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
If an article is required to be approved under this chapter, it may be approved—
  1. (a)Under a PMA;
  2. (b)Under a TSO;
  3. (c)In conjunction with type certification procedures for a product; or
  4. (d)In any other manner approved by the FAA.