U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 14Chapter IPart 21Subpart O - Subpart O—Technical Standard Order Approvals
§ 21.601 - Applicability and definitions.
§ 21.603 - Application.
§ 21.605 - Organization.
§ 21.607 - Quality system.
§ 21.608 - Quality manual.
§ 21.609 - Location of or change to manufacturing facilities.
§ 21.610 - Inspections and tests.
§ 21.611 - Issuance.
§ 21.613 - Duration.
§ 21.614 - Transferability.
§ 21.616 - Responsibility of holder.
§ 21.618 - Approval for deviation.
§ 21.619 - Design changes.
§ 21.620 - Changes in quality system.
§ 21.621 - Issue of letters of TSO design approval: Import articles.
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