14 CFR §21.140
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each applicant for or holder of a production certificate must allow the FAA to inspect its quality system, facilities, technical data, and any manufactured products or articles and witness any tests, including any inspections or tests at a supplier facility, necessary to determine compliance with this subchapter.