Part 91

Part 91
Name	Part 91
Jurisdiction	United States
Issuing authority	Federal Aviation Administration
Related legislation	Air Commerce Act, Federal Aviation Act of 1958
First issued	1960s
Amended	Multiple amendments
Subject	Aviation general operating and flight rules

Part 91

Part 91 establishes general operating and flight rules for civil aviation under the Federal Aviation Administration framework. It frames baseline standards for aircraft operations involving private pilots, corporate operators, and some non-commercial activities, interacting with other regulatory regimes such as Title 14 of the Code of Federal Regulations and statutes enacted by United States Congress. The rules influence practices at locations from Los Angeles International Airport to regional fields like Teterboro Airport and affect participants including National Business Aviation Association members and operators affiliated with institutions such as Princeton University and corporations like Boeing.

Overview

Part 91 is codified within Title 14 of the Code of Federal Regulations and articulates general operating and flight rules applicable to many forms of civil aviation. It is administered by the Federal Aviation Administration and complements safety oversight by entities like the National Transportation Safety Board and advisory input from organizations such as the Aircraft Owners and Pilots Association and the International Civil Aviation Organization. Its provisions reference operational contexts familiar to stakeholders at airports including John F. Kennedy International Airport, Chicago O'Hare International Airport, and Dallas/Fort Worth International Airport, and it is invoked in civil aviation discourse alongside laws like the Federal Aviation Act of 1958.

Applicability and Scope

Part 91 applies to operations by civil aircraft when not conducted under other specific regulatory parts such as those overseen by Department of Transportation-certified carriers. It typically governs private flights operated by individuals licensed through programs referencing testing standards used by organizations like Federal Aviation Administration Airman Certification Standards and affects operations by entities ranging from small owners in Eagle County Regional Airport to corporate flight departments at companies like General Electric. The scope excludes many commercial air carrier operations conducted under Part 121 (air carriers), on-demand operations under Part 135 (commuter and on-demand operations), and specialized operations governed by parts such as Part 141 (pilot schools) and Part 145 (repair stations).

Operational Requirements and Limitations

Operational rules under Part 91 cover airworthiness, flight crew qualifications, and flight operations including minimum equipment lists referenced in aircraft documentation from manufacturers like Cessna, Bombardier Aerospace, and Airbus. It prescribes pilot certification and recent experience requirements that interact with records maintained by institutions such as the Civil Air Patrol and certifications modeled after standards used by Pratt & Whitney maintenance programs. Part 91 defines VFR and IFR procedures applied at controlled airspace around hubs like Hartsfield–Jackson Atlanta International Airport and terminals operated by authorities such as the Port Authority of New York and New Jersey. It also governs fuel requirements, altimeter settings, and rules for operating in special use airspace established in coordination with entities like the Department of Defense and locations such as Edwards Air Force Base.

Safety and Compliance Provisions

Safety provisions within Part 91 address mandatory inspections, maintenance logs, and crew rest considerations that mirror safety culture advocated by groups like Flight Safety Foundation and International Air Transport Association. Compliance mechanisms involve FAA oversight, inspection routines that may reference technical data from Rolls-Royce Holdings or Honeywell International, and incident reporting pathways coordinated with the National Transportation Safety Board for accident investigation. The rules mandate adherence to equipment requirements, emergency procedures practiced at facilities such as Eglin Air Force Base during joint exercises, and operations in controlled airspace managed by Air Traffic Control centers serving regions including Seattle-Tacoma and Miami. Enforcement action and corrective measures are administered by the Federal Aviation Administration and can involve legal processes in federal courts such as the United States Court of Appeals for the District of Columbia Circuit.

Differences from Other Parts (e.g., Part 121, Part 135)

Part 91 differs from Part 121 (air carriers) and Part 135 (commuter and on-demand operations) chiefly by the degree of prescriptive operational control and economic oversight. Part 121 imposes extensive requirements on scheduled airlines like Delta Air Lines, American Airlines, and United Airlines—including crew duty cycles, dispatch systems, and maintenance programs—while Part 135 regulates on-demand operators such as air taxi services and charter operators affiliated with companies like NetJets and regional carriers operating from airports like Nashville International Airport. Part 91 generally allows more operational flexibility for private operators and corporate flight departments, whereas Parts 121 and 135 require specific operational specifications, manual approvals, and certification processes overseen by the Federal Aviation Administration.

History and Regulatory Development

The regulatory lineage of Part 91 traces back to early federal aviation statutes including the Air Commerce Act and the institutionalization of aviation safety under the Federal Aviation Act of 1958. Over decades, amendments to Part 91 responded to evolving technology from manufacturers such as Lockheed Martin and Northrop Grumman, incidents investigated by the National Transportation Safety Board, and policy guidance from international bodies like the International Civil Aviation Organization. Key milestones include revisions prompted by safety events involving operators at airports like LaGuardia Airport and regulatory adjustments reflecting trends in business aviation advocated by groups such as the National Business Aviation Association. The rule continues to evolve through FAA rulemaking, public docket processes involving stakeholders such as Aircraft Owners and Pilots Association and industry partners like GE Aviation.

Category:Aviation law