FAA Regulations and Enforcement

The Federal Aviation Administration (FAA) is the civil aviation authority of the United States. Its binding rules are Title 14 of the Code of Federal Regulations (14 CFR), Aeronautics and Space, which cover the certification of aircraft and airmen, the use of airspace and the operation of every civil aircraft from a glider to a wide-body airliner. Around the rules the FAA publishes guidance that explains how to comply, issues documents that permit operations the rules would otherwise forbid, and runs an inspection and enforcement system that decides what happens when someone gets it wrong.

The FAA knowledge tests ask where a rule lives and what it says. A pilot also needs to know what follows a mistake: how a possible deviation is reported, what an investigation looks like, and what protection voluntary safety reporting gives.

Title 14 CFR structure

The Code of Federal Regulations (CFR) collects the permanent rules of the US federal agencies, arranged in titles by subject. Title 14 is divided into chapters, and Chapter I, Parts 1 to 199, belongs to the FAA. Pilots still call these rules the FARs, Federal Aviation Regulations. Chapter I is grouped into subchapters:

A citation names the part and the section: 14 CFR 91.103 is section 103 of Part 91, and 91.103(b)(1) is a paragraph within it. Sections are grouped into subparts, and definitions used throughout the chapter sit in 14 CFR 1.1. New rules and amendments go through public rulemaking under Part 11, which also lets anyone petition for an exemption from a rule, usually granted with conditions; Exemption 3585, on dispatching airline flights against forecasts whose conditional part, such as a TEMPO or PROB group, is below minimums, is a well-known example.

Part 91, the general operating rules

14 CFR Part 91, General Operating and Flight Rules, applies to the operation of almost every civil aircraft in the United States. A private pilot flies under Part 91 alone. Airlines and charter operators fly under Part 91 plus the stricter requirements of Part 121 or Part 135, which add to Part 91 rather than replace it (see commercial and private operations).

The subparts most often examined are:

• Subpart A, General: 91.3, the responsibility and authority of the pilot in command; 91.7, the pilot in command's decision whether the aircraft is in condition for safe flight; 91.13, careless or reckless operation; 91.17, alcohol and drugs, with the 8-hour and 0.04 per cent limits; 91.25, the use of ASRS reports.
• Subpart B, Flight rules: 91.103, preflight action; 91.119, minimum safe altitudes; 91.123, compliance with ATC clearances; 91.155, basic VFR weather minimums; 91.167, IFR fuel; 91.175, take-off and landing under IFR.
• Subpart C, Equipment, instrument and certificate requirements: 91.211, supplemental oxygen; 91.213, inoperative instruments and equipment; 91.215, transponders.
• Subpart D, Special flight operations, such as towing (91.311) and experimental aircraft (91.319); Subpart E, Maintenance, such as the annual and 100-hour inspections of 91.409; Subpart J, Waivers; Subpart K, Fractional ownership operations.

Advisory circulars and SAFOs

An Advisory Circular (AC) explains a regulation or a subject and usually describes one acceptable means of compliance, not the only one. It is not binding unless a rule, or an operator's approved programme, makes it so. The number before the hyphen follows the subject areas of 14 CFR: a 61-series AC concerns airmen, a 91-series general operating rules and a 120-series air carriers, while the 00 series is general. A suffix letter marks the revision, so AC 120-51E is the fifth revision of the crew resource management circular.

A Safety Alert for Operators (SAFO) is a Flight Standards notice carrying important safety information, often with recommended action. Its number begins with the year of issue: SAFO 13002 and SAFO 17007 encourage operators to give pilots opportunities for manual flight, and SAFO 19003 warns that wet-runway landing data may not leave a safe stopping margin in moderate or heavy rain. The companion Information for Operators (InFO) passes on useful information without the urgency of a SAFO.

The handbooks teach, the Aeronautical Information Manual describes procedures but is not regulatory, FAA orders instruct the agency's own staff, and legal interpretations from the Chief Counsel say how the FAA reads a rule.

Waivers, LOAs and LODAs

Several documents let an operation go ahead that a rule would otherwise forbid or restrict:

• A Certificate of Waiver or Authorization is issued under Part 91 Subpart J. It waives a rule listed in 91.905 when the FAA finds that the operation can be conducted safely under the certificate's conditions, or authorises an operation that a rule permits only with FAA approval. Aerial work below the altitudes of 91.119 and banner towing under 91.311 both depend on one.
• A Letter of Authorization (LOA) authorises a specific operation, equipment or programme for an operator that has no operations specifications. A Part 91 operator's minimum equipment list is approved with an LOA, and a nonstop sightseeing tour under 91.147 needs one. Since January 2019 a Part 91 operator whose RVSM-compliant aircraft has qualifying ADS-B Out needs no RVSM LOA in US airspace (Part 91, Appendix G, section 9).
• A Letter of Deviation Authority (LODA) permits a stated deviation from a rule. It is, for example, how the FAA authorises some flight training for compensation in experimental and limited-category aircraft, which may not otherwise carry persons for compensation or hire; since December 2024 the rule is 91.326, and some such training needs no LODA.

Air carriers and commercial operators receive the equivalent authorisations in their operations specifications (see air operator certification).

Flight Standards District Offices

The FAA's Flight Standards Service certificates and oversees airmen, operators and maintenance organisations. Its local offices are the Flight Standards District Offices (FSDOs), whose aviation safety inspectors deal with the public: they issue special flight permits for aircraft that need to be ferried to a place of repair, process waivers and certificates, carry out ramp inspections and investigate possible violations.

Pilot deviations and investigations

A pilot deviation is an action of a pilot that results in a violation of a federal aviation regulation. Typical cases are altitude and heading deviations from a clearance, runway incursions, entry into Class B or Class C airspace without the required clearance or communication, and flight into a temporary flight restriction.

When a controller believes a deviation may have occurred, the controller tells the pilot on the frequency that a possible pilot deviation has occurred and gives a telephone number for the facility. This advisory is known as the Brasher warning, after the 1987 NTSB case Administrator v. Brasher, in which no sanction was imposed because the pilot had not been told in time. It puts the pilot on notice while the details are fresh; it is not a finding of a violation. A sensible pilot flies the aeroplane first, notes the times, frequencies and what was said, and calls later with a clear head.

An investigation is normally opened by an aviation safety inspector, who sends the pilot a Letter of Investigation (LOI). It states the facts being investigated and invites a written statement within a stated period. The pilot is not obliged to answer, and anything written may be used as evidence.

The Pilot's Bill of Rights, a US law of 2012, sets the pilot's procedural rights. The FAA must tell an airman under investigation, in writing and in good time, what the investigation concerns, that no response is required and that any response may be used against the airman, and it must give access to the relevant air traffic data. The law also lets an airman take an NTSB decision upholding a certificate action to a federal district court, which reviews the case afresh.

Compliance program and enforcement

The FAA Compliance Program, set out in FAA Order 8000.373 and applied through the Compliance and Enforcement Program order, 2150.3C, aims first at restoring compliance. When a deviation was unintentional, was not reckless, and the person is willing and able to comply, the FAA normally uses a compliance action: counselling, remedial training or a change to a procedure that removes the cause. A compliance action is not a finding of violation.

Enforcement is reserved mainly for intentional or reckless deviations, repeated deviations and a refusal or failure to correct them; doubts about a person's competence or qualification are met with remedial measures, which may include enforcement. It takes two forms:

• Administrative action: a warning notice or a letter of correction.
• Legal enforcement: a civil penalty, or a certificate action that suspends the certificate for a period or revokes it.

Separately, when there is reason to doubt that a certificate holder is still competent, the FAA may require reexamination under 49 U.S.C. 44709.

Certificate actions may be appealed to the National Transportation Safety Board (NTSB), first before an administrative law judge and then before the full Board, and from there to the federal courts. Enforcement actions ending in a finding of violation appear in the Pilot Records Database (Part 111), which a hiring operator must review.

Falsification was long covered for pilots by 14 CFR 61.59: a fraudulent or intentionally false statement on an application, or entry in a logbook, record or report used to show compliance, the fraudulent reproduction of a certificate or any alteration of one, was a basis for suspending or revoking any certificate the person held. Since 3 November 2025 the falsification rules of Part 61 and many other parts sit together in Part 3, Subpart D (14 CFR 3.403), and 61.59 is reserved. A false statement on a medical application can also be prosecuted as a federal crime. Under 61.15 a motor vehicle action involving alcohol or drugs must be reported to the FAA within 60 days, and two such actions within three years are grounds for denial, suspension or revocation. Refusing a test under 91.17(c) is itself grounds for certificate action.

NASA ASRS reporting

The Aviation Safety Reporting System (ASRS) is a confidential, voluntary reporting programme run by the National Aeronautics and Space Administration (NASA) on behalf of the FAA, so that reports go to a third party rather than to the regulator. NASA removes the identity of the reporter and uses the reports to identify hazards and publish safety information. Anyone involved in aviation may file.

Two protections apply. Under 91.25 the FAA may not use an ASRS report, or information derived from it, in an enforcement action, except information about accidents and criminal offences. Under AC 00-46 the FAA treats a timely report as evidence of a constructive attitude: if a violation is proved by other means, no civil penalty or certificate suspension is imposed when the violation was inadvertent and not deliberate, involved no criminal offence, accident or lack of qualification or competence, the person has not been found in an FAA enforcement action to have committed a violation in the previous five years, and the report was filed within 10 days of the violation or of becoming aware of it. The finding of violation remains on the record, which in practice limits the waiver to once in five years.

Airline crews also have company programmes. The Aviation Safety Action Program (ASAP), described in AC 120-66C, is a partnership of the FAA, the carrier and the pilots' union: an accepted report within the programme's time limit is dealt with by corrective action rather than legal enforcement or company discipline, except for intentional disregard of safety, criminal acts, substance abuse and intentional falsification. Flight Operational Quality Assurance (FOQA) data from an approved programme may not be used for enforcement under 14 CFR 13.401, except for criminal or deliberate acts (see safety culture and occurrence reporting).

Library articles are written for study and exam preparation. They do not replace your aircraft's approved documentation, your operator's procedures or the regulations themselves.