Tap any paragraph to write a margin note. Your notes collect in the Desk below the text and file under cases with @. The side-by-side margin rail opens on a larger screen.

§
Marginalia
Code · CFR · Title 14 — Aeronautics and Space · Part 21 — Certification Procedures for Products and Articles · § 21.313

§ 21.313. Duration.

13 words·~1 min read·/us/cfr/t14/s§ 21.313·

A research copy — for the controlling text, always check the official state or federal source. Not legal advice.

A PMA is effective until surrendered, withdrawn, or the FAA otherwise terminates it.
★   the supreme law of the land   ★
Don't Tread on Me
E Pluribus Unum — out of many, one

"If you don't know your rights, you don't have any."

Marginalia · a citizen's law index
A research desk, not legal advice. Always read the cited source before relying on a summary.
Questions or an issue? support@self-law.org
disclaimerMarginalia is a research index, not a law firm. Nothing on this site is legal, tax, or financial advice and no attorney–client relationship is formed by using it. Statutes, regulations, and case law change; summaries, search results, AI output, and member posts may be incomplete, out of date, or wrong. Any interpretation drawn from material on this site should be validated by a licensed attorney in your jurisdiction before you act on it.