Structure of the Federal Aviation Regulations and FAA Authority

What Is Title 14 CFR?

Federal law in the United States is organized into the Code of Federal Regulations (CFR), which is divided into titles by subject area. Aviation is governed by Title 14 of the CFR, commonly called 14 CFR or the Federal Aviation Regulations (FARs). Every rule that the Federal Aviation Administration (FAA) enforces has its legal home somewhere in Title 14.

Title 14 is further divided into chapters, subchapters, and parts. For practical day-to-day work, mechanics deal mainly at the Part level. Each Part covers a specific subject. For example:

• Part 1 — Definitions and abbreviations used throughout the regulations
• Part 43 — Maintenance, preventive maintenance, rebuilding, and alteration
• Part 65 — Certification of airmen other than flight crewmembers (including mechanics)
• Part 91 — General operating and flight rules
• Part 145 — Repair stations

Within each Part, individual rules are called sections, written with the § symbol. A citation such as 14 CFR § 43.3 means Title 14, Part 43, Section 3. Sections are grouped into subparts labeled with letters (Subpart A, Subpart B, and so on). When you see a regulatory citation, read it left to right: Title → Part → Section.

FAA Authority — Where Does It Come From?

Congress grants the FAA its authority through the Federal Aviation Act (now codified in Title 49 of the United States Code). Under that statutory authority, the FAA Administrator issues regulations through a formal process called notice-and-comment rulemaking, governed by the Administrative Procedure Act. This means the FAA must publish a proposed rule, accept public comments, consider those comments, and then publish a final rule in the Federal Register before it becomes enforceable law.

The FAA is organized into several offices whose work touches maintenance directly:

• Aircraft Certification Service (AIR) — certifies aircraft designs and issues type certificates
• Flight Standards Service (AFS) — oversees mechanic certification, repair stations, and airworthiness
• Office of Rulemaking (ARM) — manages the rulemaking process

The Hierarchy of Regulatory Documents

Not every FAA document carries the same legal weight. Understanding this hierarchy protects you legally and professionally.

1. Title 14 CFR (Regulations) — These are binding law. Violating a CFR section can result in civil penalties, certificate suspension, or revocation. A regulation says what must be done.

2. FAA Orders — Internal FAA policy documents that direct FAA employees on how to administer and interpret regulations. FAA Order 8900.1 (Flight Standards Information Management System), for example, tells FAA Aviation Safety Inspectors how to evaluate repair stations and mechanics. Orders are not law for certificate holders, but they reveal how inspectors will judge compliance, making them highly relevant to your work.

3. Advisory Circulars (ACs) — Guidance documents that describe one acceptable means of compliance with a regulation. ACs are not mandatory; however, if you choose a different method, you must show it meets the regulatory standard just as well. AC 00-2, the Advisory Circular Checklist, lists all current ACs and their status. Always verify you are using a current AC; cancelled ACs should not be relied upon.

4. Airworthiness Directives (ADs) — Although ADs are published separately, they are legally part of 14 CFR Part 39 and are therefore mandatory. An AD requires specific maintenance action within a stated time limit. Failure to comply with an applicable AD makes an aircraft unairworthy and exposes the responsible mechanic to enforcement action.

5. Manufacturer's Maintenance Manuals — Required by regulation to be followed when they exist, but the source of their authority is the regulation (typically Part 43), not the manual itself. If a conflict exists between a manual and an AD, the AD takes precedence because it is regulation.

Airworthiness Directives and the Rulemaking Process

An AD begins when the FAA identifies an unsafe condition. The typical path:

1. Notice of Proposed Rulemaking (NPRM) — The issuing office (usually AIR for design-related issues) publishes the proposed AD in the Federal Register and invites public comment.

2. Comment period — Manufacturers, operators, and mechanics may submit technical comments.

3. Final Rule — After reviewing comments, the FAA publishes the final AD in the Federal Register. It is then incorporated into the CFR.

4. Emergency ADs — In urgent safety situations the FAA may issue an AD without an NPRM using the authority in Part 39.

Using the FAA Regulatory and Guidance Library

The FAA Regulatory and Guidance Library at rgl.faa.gov is the official public source for current regulations, ACs, Orders, and ADs. When researching any regulatory question, always check rgl.faa.gov or the Electronic CFR (eCFR) at ecfr.gov for the current, official text. Print copies go out of date; always verify currency.

Safety Note

Regulatory compliance is itself a safety practice. Using a superseded AC or an outdated maintenance manual without verifying currency is a documented contributor to maintenance errors. Before beginning any maintenance task, confirm you have the current, approved data. This is not optional — it is required by 14 CFR Part 43.