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  5. § 91.851
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14 CFR · Part 91

14 CFR § 91.851

Definitions.

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Read in Subpart I
Part 91 Contents
  • Special Federal Aviation Regulation No. 50-2: Special Flight Rules in the Vicinity of the Grand Canyon National Park, AZ
  • Special Federal Aviation Regulation No. 60: Air Traffic Control System Emergency Operation
  • Special Federal Aviation Regulation No. 97: Special Operating Rules for the Conduct of Instrument Flight Rules (IFR) Area Navigation (RNAV) Operations using Global Positioning Systems (GPS) in Alaska
  • Special Federal Aviation Regulation No. 104: Prohibition Against Certain Flights by Syrian Air Carriers to the United States
  • Subpart A: General
  • Subpart B: Flight Rules
  • Subpart C: Equipment, Instrument, and Certificate Requirements
  • Subpart D: Special Flight Operations
  • Subpart E: Maintenance, Preventive Maintenance, and Alterations
  • Subpart F: Large and Turbine-Powered Multiengine Airplanes and Fractional Ownership Program Aircraft
  • Subpart G: Additional Equipment and Operating Requirements for Large and Transport Category Aircraft
  • Subpart H: Foreign Aircraft Operations and Operations of U.S.-Registered Civil Aircraft Outside of the United States; and Rules Governing Persons on Board Such Aircraft
  • Subpart I: Operating Noise Limits
  • Subpart J: Waivers
  • Subpart K: Fractional Ownership Operations
  • Subpart L: Continued Airworthiness and Safety Improvements
  • Subpart M: Special Federal Aviation Regulations
  • Subpart N: Mitsubishi MU-2B Series Special Training, Experience, and Operating Requirements
  • Appendix A to Part 91: Category II Operations: Manual, Instruments, Equipment, and Maintenance
  • Appendix D to Part 91: Airports/Locations: Special Operating Restrictions
  • Appendix E to Part 91: Airplane Flight Recorder Specifications
  • Appendix F to Part 91: Helicopter Flight Recorder Specifications
  • Appendix G to Part 91: Operations in Reduced Vertical Separation Minimum (RVSM) Airspace

For the purposes of §§ 91.851 through 91.877 of this subpart:

Chapter 4 noise level means a noise level at or below the maximum noise level prescribed in Chapter 4, Paragraph 4.4, Maximum Noise Levels, of the International Civil Aviation Organization (ICAO) Annex 16, Volume I, Amendment 7, effective March 21, 2002. The Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51 approved the incorporation by reference of this document, which can be obtained from the International Civil Aviation Organization (ICAO), Document Sales Unit, 999 University Street, Montreal, Quebec H3C 5H7, Canada. Also, you may obtain documents on the Internet at http://www.ICAO.int/eshop/index.cfm. Copies may be reviewed at the U.S. Department of Transportation, Docket Operations, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590 or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.

Contiguous United States means the area encompassed by the 48 contiguous United States and the District of Columbia.

Fleet means those civil subsonic jet (turbojet) airplanes with a maximum certificated weight of more than 75,000 pounds that are listed on an operator's operations specifications as eligible for operation in the contiguous United States.

Import means a change in ownership of an airplane from a non-U.S. person to a U.S. person when the airplane is brought into the United States for operation.

Operations specifications means an enumeration of airplanes by type, model, series, and serial number operated by the operator or foreign air carrier on a given day, regardless of how or whether such airplanes are formally listed or designated by the operator.

Owner means any person that has indicia of ownership sufficient to register the airplane in the United States pursuant to part 47 of this chapter.

New entrant means an air carrier or foreign air carrier that, on or before November 5, 1990, did not conduct operations under part 121 or 129 of this chapter using an airplane covered by this subpart to or from any airport in the contiguous United States, but that initiates such operation after that date.

Stage 2 noise levels mean the requirements for Stage 2 noise levels as defined in part 36 of this chapter in effect on November 5, 1990.

Stage 3 noise levels mean the requirements for Stage 3 noise levels as defined in part 36 of this chapter in effect on November 5, 1990.

Stage 4 noise level means a noise level at or below the Stage 4 noise limit prescribed in part 36 of this chapter.

Stage 2 airplane means a civil subsonic jet (turbojet) airplane with a maximum certificated weight of 75,000 pounds or more that complies with Stage 2 noise levels as defined in part 36 of this chapter.

Stage 3 airplane means a civil subsonic jet (turbojet) airplane with a maximum certificated weight of 75,000 pounds or more that complies with Stage 3 noise levels as defined in part 36 of this chapter.

Stage 4 airplane means an airplane that has been shown not to exceed the Stage 4 noise limit prescribed in part 36 of this chapter. A Stage 4 airplane complies with all of the noise operating rules of this part.

Stage 5 airplane means an airplane that has been shown not to exceed the Stage 5 noise limit prescribed in part 36 of this chapter. A Stage 5 airplane complies with all of the noise operating rules of this part.

Stage 5 noise level means a noise level at or below the Stage 5 noise limit prescribed in part 36 of this chapter.

Referenced By

Interpretations of This Section (1)

  • Willkie (Department of Commerce), 1990

Documents that cite this section, found in their catalog metadata or text. Listed by date, not by significance.

Regulations Referenced

14 CFR 91.85114 CFR 91.87714 CFR Part 4714 CFR Part 121

Reflects the eCFR edition current as of July 6, 2026. Retrieved from ecfr.gov on July 17, 2026.

Primary Source

  • Official Source (14 CFR · Part 91)