FAR 21.121 — Production Under Type Certificate
FAR 21.121 sets the applicability of FAA rules for aircraft production under a type certificate. Key reference for pilots studying Part 21 certification.
FAR 21.121 is a short but important opening section of Subpart F of Part 21. It simply states that this subpart prescribes the rules for production under a type certificate.
In plain terms:
- A type certificate (TC) is the FAA's approval that a particular aircraft, engine, or propeller design meets airworthiness standards.
- Once a TC is issued, the manufacturer needs FAA-approved procedures to actually build that product in series.
- Subpart F (which begins at 21.121) lays out those production rules — quality control, inspections, FAA oversight, and limits on how many units can be built before a Production Certificate is required.
Why it matters operationally: As a pilot, you'll fly aircraft that were built under these rules. The airworthiness data plate, the standard airworthiness certificate, and the assurance that your airplane matches its approved type design all trace back to compliance with this subpart. Understanding 21.121 helps you see the regulatory chain from design approval to the airplane on the ramp.
Five FAA-written-style questions. Instant explanations, every answer cites its source — no account needed.
You are flying VFR in Class E airspace at 8,500 feet MSL during the day. What are your minimum visibility and cloud clearance requirements?