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Three primary airworthiness regulations

Aviation Mechanic General (AMG) practice question 16 of 37 on Regulations, Maintenance Forms, Records, and Publications. ACS element AM.I.I.K8 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONAccording to the handbook, which three 14 CFR parts are the primary regulations that govern the airworthiness of an aircraft?

  1. AParts 23, 39, and 145
  2. BParts 1, 65, and 147
  3. CParts 21, 43, and 91
Show the answer and explanation

Correct answer: C. Parts 21, 43, and 91

  • A — incorrect Part 23 is an airworthiness standard for airplanes, part 39 covers airworthiness directives, and part 145 covers repair stations; the handbook shows these linking to the three primary regulations, not replacing them.
  • B — incorrect Part 1 is definitions, part 65 certificates airmen other than flight crewmembers, and part 147 governs maintenance technician schools; none is one of the three primary airworthiness regulations.
  • C — correct The handbook identifies part 21 (Certification Procedures for Products and Parts), part 43 (Maintenance, Preventive Maintenance, Rebuilding, and Alterations), and part 91 (General Operating and Flight Rules) as the three primary airworthiness regulations.

BACKGROUND

Title 14 of the Code of Federal Regulations (14 CFR) contains the Federal Aviation Administration (FAA) regulations, and the Aviation Maintenance Technician Handbook–General organizes the airworthiness-related parts around three primary regulations. These are 14 CFR part 21, Certification Procedures for Products and Parts; part 43, Maintenance, Preventive Maintenance, Rebuilding, and Alterations; and part 91, General Operating and Flight Rules. The handbook's charts show most of the other airworthiness certification regulations linking to one of these three. Part 43 is described as the heart of aviation maintenance, and § 91.403(b) ties part 91 directly to part 43 by requiring that maintenance be performed as prescribed in part 43.

STUDY TIP

Learn the three primary parts as a set with their subjects: 21 for certification, 43 for maintenance, 91 for operation.

KEY POINTS

  • The three primary airworthiness regulations are 14 CFR parts 21, 43, and 91.
  • Part 21 covers certification procedures, part 43 covers maintenance, and part 91 covers operating rules.
  • Most other airworthiness regulations link to one of these three.

SOURCES

  • FAA-H-8083-30B ch02 "Overview--Title 14 of the Code of Federal Regulations (14 CFR)"
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SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-30B Aviation Maintenance Technician Handbook – General, 14 CFR part 43 and part 65. Regulations and handbooks are revised; confirm details against the current edition.