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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.

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
91-14D AFS-340 Altimeter Setting Sources Provides the aviation public and industry with guidelines for setting up reliable altimeter setting sources. 04-09-1979
91-13C 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
91-6A 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
90-116 AFS-800 Additional Pilot Program for Phase I Flight Test

This advisory circular (AC) provides information and guidance on the Additional Pilot Program (APP) for flight testing experimental aircraft. The APP was developed to improve safety by enhancing Builder/Owner Pilot (BP) skills and mitigate risks associated with Phase I flight testing of aircraft built from commercially produced kits through the use of a qualified additional pilot and powerplant testing. The APP is an optional program which provides another pathway to conducting Phase I flight testing. The traditional option for a pilot to test their aircraft solo during Phase I is not covered or affected by this AC, and remains an option for those who choose to do so in accordance with their aircraft’s operating limitations.

90-115 AJR-1 Collaborative Trajectory Options Program (CTOP)

This Advisory Circular provides guidance to customers of the National Airspace System (NAS) regarding a new traffic management initiative for managing flights through a constrained area.  The new traffic management initiative builds upon concepts found in Ground Delay Programs (GDPs), Airspace Flow Programs (AFPs; AC 90-102A) and required reroutes.  The new initiative is called the Collaborative Trajectory Options Program or CTOP. The CTOP is one of many new traffic management initiatives being developed within Collaborative Air Traffic Management Technologies (CATMT) as we progress toward the Next-Generation Air Transportation System (NextGen).

90-114A AFS-400 Automatic Dependent Surveillance-Broadcast Operations

The Federal Aviation Administration (FAA) has issued a new rule contained in Title 14 of the Code of Federal Regulations (14 CFR) part 91, §§ 91.225 and 91.227. This rule requires Automatic Dependent Surveillance-Broadcast (ADS-B) Out performance when operating in designated classes of airspace within the U.S. National Airspace System (NAS) after January 1, 2020. This advisory circular (AC) provides users of the NAS guidance on a means of conducting flight operations in accordance with §§ 91.225 and 91.227. The appendices in this AC provide guidance for additional operations enabled by ADS-B to include ADS-B In.

90-113A AFS-400 Instrument Flight Procedure Validation (IFPV) of Satellite-based Instrument Flight Procedures (IFPs)

This advisory circular (AC) provides guidance for conducting instrument flight procedure validation (IFPV) of satellite-based performance-based navigation (PBN) instrument flight procedures (IFP) for both fixed-wing and helicopter aircraft. It also addresses validation of helicopter wide area augmentation system (WAAS) special IFP. This AC supplements and does not change the requirements of Federal Aviation Administration (FAA) Order 8200.1, United States Standard Flight Inspection Manual. Ground validation, preflight validation (including simulator evaluation and obstacle assessment), and flight validation are described in this document.

The primary audience for this AC is non-FAA service providers performing IFPV. The secondary audience is Flight Standards Service Aviation Safety Inspectors and Air Traffic Organization (ATO) personnel within the FAA who are directly associated with the FAA IFPV process and/or charged with the responsibility to authorize and provide oversight of non-FAA IFPV service providers.

90-112A AFS-400 Development and Submission of Special Instrument Procedures to the FAA

This Advisory Circular (AC) provides guidance for the submission and approval of special instrument flight procedures developed by non-FAA service providers and submitted to the Federal Aviation Administration (FAA) for review and approval. Special instrument procedures are those procedures developed for specific users and are not processed under Title 14, Code of Federal Regulations (14 CFR), Part 97. Occasionally, the word "must" or similar language is used within this AC where the desired action is deemed critical. The use of such language is not intended to add to, interpret, or relieve a duty imposed by 14 CFR.

90-110A AFS-460 Instrument Flight Procedure Service Provider Authorization Guidance for RequiredNavigation Performance Authorization Required Procedures

This advisory circular (AC) provides guidance for Instrument Flight Procedure(IFP) developers, hereinafter referred to as "IFP Service Providers," to become authorized by the Federal Aviation Administration (FAA) to develop Title 14 of the Code of Federal Regulations (14 CFR) Part 97 Required Navigation Performance IFPs with Authorization Required (RNP AR).

90-109A AFS-800 Transition to Unfamiliar Aircraft

This advisory circular (AC) is intended to help plan the transition to any unfamiliar fixed-wing airplanes, including type-certificated (TC) and/or experimental airplanes. It provides information and guidance to owners and pilots of experimental, simple, complex, high-performance, and/or unfamiliar airplanes. It also provides information to flight instructors who teach in these airplanes. This information and guidance contains recommendations for training experience for pilots of experimental airplanes in a variety of groupings based on performance and handling characteristics. This AC does not address the testing of newly built experimental airplanes. The current edition of AC 90-89, Amateur-Built Aircraft and Ultralight Flight Testing Handbook, provides information on such testing. However, if a pilot is planning to participate in a flight test program in an unfamiliar and/or experimental airplane, this AC should be used to develop the skills and knowledge necessary to safely accomplish the test program utilizing the guidance found in AC 90-89.

90-108 AFS-400 Use of suitable Area navigation (RNAV) system on Conventional Routes and Procedures - Change 1

This advisory circular (AC) provides operational and airworthiness guidance regrading the suitablity and use of RNAV systems while operating on or transitioning to, conventional i.e. non-RNAV, routes and procedures within the United States (US) National Airspace System (NAS).

90-107 AFS-400 Guidance for localizer performance with Vertical Guidance and Localizer


This advisory circular (AC) provides guidance for operators to conduct Title 14 of the Code of Federal Regulations (14 CFR) part 97 instrument flight rules (IFR) Area Navigation (RNAV) Global Positioning System (GPS) instrument approach procedures (IAP) with Localizer Performance with Vertical guidance (LPV) and Localizer Performance without vertical guidance (LP) lines of minima using the wide area augmentation system (WAAS).

90-106 AFS-410 Enhanced Flight Vision Systems


This advisory circular provides information to and applicant pursuing airworthiness certification and operational approval of and enhanced flight vision systems.

90-105 AFS-400 Approval Guidance for RNP Operations and Barometric Vertical Navigation in the U.S. National Airspace System 01-23-2009
90-103 AJR-0 Reporting of Threats in Accordance with the Common Strategy 09-11-2006
90-102A AJR-1 Airspace Flow Program This Advisory Circular replaces AC 90-102 and provides guidance to customers of the National Airspace System (NAS) regarding changes to the traffic management process for managing flights through a constrained area with an Airspace Flow Program (AFP). In this process, traffic managers identify a constraint in the en route system, develop a real-time list of flights that are filed into the constrained area, and implement an AFP. Pilots need to be aware that an AFP distributes expect departure clearance times (EDCT) in order to meter air traffic demand through the area. Examples of constraints include thunderstorm activity, turbulence, and periods of excess demand. The list of flights includes aircraft that have filed flight plans, filed early intent flight plans, or operate in the constrained area based on historical flight plan data. 05-30-2008
90-102 AJR-1 Airspace Flow Program 05-01-2006
90-101A AFS-400 Approval Guidance for RNP Procedures with Special Aircraft and Aircrew Authorization Required (SAAAR)

This advisory circular (AC) provides airworthiness and operational approval guidance material for aircraft operators conducting Title 14 of the Code of Federal Regulations (14 CFR) part 97 Area Navigation (RNAV) Required Navigation Performance (RNP) instrument approach procedures (IAP) with Authorization Required (AR), charted as "RNAV (RNP) RWY XX." Hereafter, refer to these procedures as "RNP AR" within this AC. Operational approvals obtained under the guidelines of this AC also apply to existing RNAV (RNP) IAP with special aircraft and aircrew authorization required (SAAAR). As current RNAV (RNP) SAAAR instrument approach charts are revised or amended, they will be updated to reflect AR.

90-100A AFS-400 U.S Terminal and En Route Area Navigation (RNAV) Operations with Change 2

This advisory circular (AC) provides operational and airworthiness guidance for operation on U.S. Area Navigation (RNAV) routes, Instrument Departure Procedures (DPs), and Standard Terminal Arrivals (STARs). Operators and pilots should use the guidance in this AC to determine their eligibility for these U.S. RNAV routes and procedures. In lieu of following this guidance without deviation, operators may elect to follow an alternative method, provided the alternative method is found to be acceptable by the Federal Aviation Administration (FAA). For the purpose of this AC, "compliance" means meeting operational and functional performance criteria. Mandatory terms in this AC such as "must" are used only to ensure applicability of these particular methods of compliance when the acceptable means of compliance described are used. This AC does not change, add, or delete regulatory requirements or authorize deviations from regulatory requirements.

90-99 ATA-301 High Altitude Airspace Redesign Phase 1 09-22-2003
90-96A AFS-400 Approval of U.S. Operators and Aircraft to Operate Under Instrument Flight Rules (IFR) in European Airspace Designated for Basic Area Navigation (B-RNAV) and Precision Area Navigation (P-RNAV)

Provides guidance regarding on-board Area Navigation (BRNAV) equipment requirements for operators of U.S. registered civil aircraft, operating in a Basic Area Navigation (BRNAV) environment in the European region.

90-95 AFS-800 Unanticipated Right Yaw in Helicopters Examines the unanticipated right yaw phenomenon, the circumstances under which it may be encountered, how it can be prevented, and how the pilot should react if it is encountered. 02-07-1995
90-93B AJT-0 Operating Procedures for Airport Traffic Control Towers (ATCT) that are not Operated by, or Under Contract with, the United States (Non-Federal)

This advisory circular (AC) recommends publications, administrative, and operational procedures that will assist in the management of a non-Federal ATCT (NFCT).


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