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Number Office Title Date
91-6A AFS-223 Water, Slush, and Snow on the Runway Provides background and guidelines concerning the operation of turbojet aircraft with water, slush, and/or snow on the runway. 05-24-1978
91-13C AFS-820 Cold Weather Operation of Aircraft Provides background and guidelines relating to operation of aircraft in the colder climates where wide temperature changes may occur. 07-24-1979
91-14D AFS-340 Altimeter Setting Sources Provides the aviation public and industry with guidelines for setting up reliable altimeter setting sources. 04-09-1979
91-16 AFS-820 Category II Operations - General Aviation Airplanes Sets forth acceptable means by which Category II operations may be approved in accordance with FAR Parts 23, 25, 61, 91, 97, and 135. 08-07-1967
91-26 AFS-310 Maintenance and Handling of Airdriven Gyroscopic Instruments Advises operators of general aviation aircraft of the need for proper maintenance of air-driven gyroscopic instruments and associated air filters. 07-02-1969
91-32B AFS-820 Safety in and Around Helicopters

This Advisory Circular (AC) provides safety guidelines for persons associated with helicopter operations and suggests ways to avoid hazards and reduce the risk of accidents. The information in this AC pertains primarily to helicopter operations conducted under the provisions of Title 14 of the Code of Federal Regulations (14 CFR) part 91; however, the safety considerations discussed may be applicable to all helicopter operations.

02-18-1997
91-33A ANE-110 Use of Alternate Grades of Aviation Gasoline for Grade 80/87, and Use of Automotive Gasoline Provides information relating to the use of alternate grades of gasoline when grade 80/87 aviation is not available and the resultant effects of the use of the alternate fuels which have higher TEL (tetraethyl lead) content. Suggestions are offered as acceptable means of avoiding engine operating difficulties when using alternate fuels. This circular also provides suggestions for added safety in the use of automotive gasoline in those aircraft engines and aircraft covered by Supplemental Type Certificates (STCs). 07-18-1984
91-35 AAM-620 Noise, Hearing Damage, and Fatigue in General Aviation Pilots Acquaints pilots with the hazards of regular exposure to cockpit noise. Especially pertinent are piston-engine, fixed-wing, and rotary-wing aircraft. 03-28-1972
91-36D ATO-R Visual Flight Rules (VFR) Flight Near Noise-Sensitive Areas Encourages pilots making VFR flights near noise-sensitive areas to fly at altitudes higher than the minimum permitted by regulation and on flight paths, which will reduce aircraft noise in such area. 09-17-2004
91-37A AFS-820 Truth in Leasing Provides information and guidance for lessees and conditional buyers of U.S. registered large civil aircraft. If you are planning to charter an airplane take a moment to learn about chartered and leased aircraft. 01-08-1974
91-42D AFS-310 Hazards of Rotating Propeller and Helicopter Rotor Blades Updates statistical information on propellers-and rotor-to-person accidents and offers suggestions to reduce the frequency of such accidents. 03-03-1983
91-44A AIR-120 Operational and Maintenance Practices for Emergency Locator Transmitters and Receivers Combines and updates material in several Advisory Circulars on the subject of emergency locator transmitters (ELT) receivers for airborne service. 12-12-1980
91-45C AFS-810 Waivers: Aviation Events Provides prospective aviation event sponsors and other interested parties with information necessary to assist in planning and conducting a safe aviation event. In addition, it provides information on the application process for a certificate of Waiver or Authorization. 02-01-1990
91-46 AFS-350 Gyroscopic Instruments - Good Operating Practices Issued to re-emphasize to general aviation instrument-rated pilots the need to determine the proper operation of gyroscopic instruments, the importance of instrument crosschecks and proficiency in partial-panel operations. 02-04-1977
91-48 AFS-820 Acrobatics-Precision Flying with a Purpose Provides information to persons who are interested in acrobatic flying to improve their piloting skills as recreation, sport, or as a competitive activity. 06-29-1977
91-50 AFS-820 Importance of Transponder Operation and Altitude Reporting Provides information and guidance concerning the importance of transponder operation and altitude reporting in the National Airspace System. 08-24-1977
91-51A AFS-820 Effect of Icing on Aircraft Control and Airplane Deice and Anti-Ice Systems Provides information for pilots regarding the hazards of aircraft icing and the use of airplane deice and anti-ice systems. 07-19-1996
91-53A AFS-820 Noise Abatement Departure Profile Describes acceptable criteria for safe noise abatement departure profiles (NADP) for subsonic turbojet-powered airplanes with a maximum certificated gross takeoff weight of more than 75,000 pounds. These procedures provide the user with one means, although not the only means, of establishing acceptable NADP’s. These departure profiles are consistent with the airworthiness standards required by the Federal Aviation Regulations Part 25 for type certification and Part 91 for general airplane operations. 07-22-1993
91-54 AFS-820 Automatic Reporting Systems Altimeter Setting and Other Operational Data Provides guidelines for the development and installation of automatic reporting systems for altimeter setting and other operational data intended for use in connection with IFR operations. 02-26-1979
91-55 AFS-310 Reduction of Electrical System Failures following Aircraft Engine Starting Warns general aviation aircraft owner/pilots and maintenance personnel of possible total electrical system failure following aircraft engine starting. 10-28-1980
91-56B ANM-115 Continuing Structural Integrity Program for Airplanes Provides guidance material to manufacturers and operators of transport category airplanes for use in developing a continuing structural integrity program to ensure safe operation of older airplanes throughout their operational lives. This guidance material applies to large transport airplanes which were certified under the fail-safe and fatigue requirements of Civil Air Regulations (CAR) 4b o 14 CFR part 25 of the Federal Aviation Regulations (FAR), prior to Amendment 25-45, and which have a maximum gross weight greater than 75,000 pounds. Guidance material on this subject for other transports is provided in AC 91-60. The procedures set forth by this AC are applicable to the large transport category airplanes operated under Subpart D of part 91, and parts 121 and 125. 03-07-2008
91-57 ATO-220 Model Aircraft Operating Standards Outlines, and encourages voluntary compliance with, safety standards for model aircraft operators. 06-09-1981
91-59A AFS-300 Inspection and Care of General Aviation Aircraft Exhaust Systems 07-23-2007
91-61 AFS-800/AAM-500 A Hazard in Aerobatics: Effects of G-Forces of Pilots Provides background information on G-forces, their effect on the human body and their role in safe flying, and offers suggestions for avoiding problems caused by acceleration encountered in aerobatic maneuvers. 02-28-1984
91-62A AIR-120 Use of Child Seats in Aircraft Provides information to assist the public in the proper use of child seats aboard aircraft and provides precautions so all occupants are able to exit rapidly from aircraft during emergencies. 10-15-1992
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