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United States Department of Transportation United States Department of Transportation

Advisory Circulars (ACs)

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Number, title, description, or office

Advisory Circulars (ACs) search results
Number Title Status Office Date
91-75 Attitude Indicator

Provides a method to substitute an approved attitude indicator for the rate-of-turn indicator mandated by Title 14 of the Code of Federal Regulations (14 CFR) part 91, section 91.205(d)(3).

Active AFS-400 2003-06-25
90-100A 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.

Active AFS-400 2007-03-01
90-101A Approval Guidance for Required Navigation Performance (RNP) Procedures with Authorization Required (AR) Including Change 1

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.

Active AFS-400 2011-02-23
90-110C Service Provider Authorization Guidance for Public Performance Based Instrument Flight Procedures (IFPs)

This AC provides guidance for non-FAA Instrument Flight Procedure (IFP) developers, hereinafter referred to as “service providers,” to become authorized by the Federal Aviation Administration (FAA) (Flight Standards’ Flight Technologies and Procedures Division) to develop public performance based IFPs.

Active AFS-400 2023-09-12
90-113C Instrument Flight Procedure Validation (IFPV of Performance Based Navigation (PBN) Instrument Flight Procedures (IFP)

This advisory circular (AC) provides the means for conducting IFPV of satellite-enabled PBN instrument flight procedures for both fixed-wing and helicopter aircraft.

Active AFS-400 2023-07-06
90-80C Approval of Offshore Standard Approach Procedures, Airborne Radar Approaches, and Helicopter En Route Descent Areas with Change 1

This AC provides criteria and describes acceptable methods for obtaining approval to use Offshore Standard Approach Procedures (OSAP), Airborne Radar Approaches (ARA), and Helicopter En Route Descent Areas (HEDA) to descend in uncontrolled airspace to an altitude where the pilot can proceed to land using visual references to the surface.

Active AFS-400 2017-12-21
91-70C Oceanic and Remote Continental Airspace Operations

The Federal Aviation Administration (FAA) (“we”) developed this AC to provide general information and guidance for certificated and General Aviation (GA) operators (“you”) planning flights in oceanic and remote continental airspace.

Active AFS-400 2023-10-04
90-106B Enhanced Flight Vision System Operations

This AC provides an explanation of enhanced flight vision system (EFVS) operations conducted under Title 14 of the Code of Federal Regulations (14 CFR), guidance for obtaining Operations Specification (OpSpec), Management Specification (MSpec), or Letter of Authorization (LOA) C048, Enhanced Flight Vision System (EFVS) Operations, and information that may facilitate the development of a training curriculum for EFVS operations.

Active AFS-400 2022-05-02
91-85B Authorization of Aircraft and Operators for Flight in Reduced Vertical Separation Minimum (RVSM) Airspace

This advisory circular (AC) provides airworthiness and operational authorization guidance material for operators, pilots, certificate holders, and/or program managers conducting Title 14 of the Code of Federal Regulations (14 CFR) part 91, §§ 91.180 and 91.706 Reduced Vertical Separation Minimum (RVSM) operations.

Active AFS-400 2019-01-29
120-57C Low Visibility Operations/Surface Movement Guidance and Control Systems (LVO/SMGCS)

This AC provides guidance for airport operators when developing an LVO/SMGCS Plan. There may be valid safety and operational reasons for a specific LVO/SMGCS Plan to vary from the AC 120-57 (current edition) guidance due to unique local issues, environmental factors, or volume of traffic operations.

Active AFS-400 2023-09-26
120-29A Criteria for Approval of Category I and Category II Weather Minima for Approach

This AC provides an acceptable means, but not the only means, for obtaining and maintaining approval of CAT I & II Weather Minima including the installation and approval of associated aircraft systems.

Active AFS-400 2002-08-12
120-28D Criteria for Approval of Category III Weather Minima for Takeoff, Landing, and Rollout

States an acceptable means, not the only means, for obtaining approval of Category III Landing Weather Minima and low visibility takeoff, including the installation and approval of associated aircraft systems.

Active AFS-400 1999-07-13
90-96A 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.

Active AFS-400 2005-01-13
90-108 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).

Active AFS-400 2011-03-03
120-55C Air Carrier Operational Approval and Use of TCAS II

This advisory circular (AC) provides an acceptable, but not the only, means to address Traffic Alert and Collision Avoidance System (TCAS) issues related to installation and use of TCAS II regarding compliance with Title 14 of the Code of Federal Regulations (14 CFR) parts 121, 125, and 129 requirements for air carriers.

Active AFS-400 2011-02-23
90-23G Aircraft Wake Turbulence

This advisory circular (AC) presents basic information on wake vortex behavior, alerts pilots to the hazards of aircraft wake turbulence, and recommends operational procedures to avoid wake turbulence encounters.

Active AFS-400 2014-02-10
90-107 Guidance for Localizer Performance with Vertical Guidance and Localizer Performance without Vertical Guidance Approach Operations in the U.S.

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).

Active AFS-400 2011-02-11
90-105A Approval Guidance for RNP Operations and Barometric Vertical Navigation in the U.S. National Airspace System and in Oceanic and Remote Continental Airspace

This advisory circular (AC) provides guidance for operators to conduct Required Navigation Performance (RNP) operations in the United States, in oceanic and remote continental airspace, and in foreign countries which adopt International Civil Aviation Organization (ICAO) standards for RNP operations.

Active AFS-400 2016-03-07
90-117 Data Link Communications

This advisory circular (AC) applies to all pilots, certificate holders, operators, and/or program managers conducting data link communication operations and to those providing data communication services on behalf of operators to meet Federal Aviation Administration (FAA) and International Civil Aviation Organization (ICAO) requirements.

Active AFS-400 2017-10-03
120-91A Airport Obstacle Analysis

This AC describes acceptable methods and guidelines for developing takeoff and initial climbout airport obstacle analyses andin-flight procedures to comply with the intent of the regulatory requirements of Title 14 of the Code of Federal Regulations (14 CFR) part 121, §§ 121.177 and 121.189; part 135, §§ 135.367, 135.379, and 135.398; and other associated one-engine-inoperative (OEI) requirements relatingto turbine-engine-powered airplanes operated under parts 121 and 135.

Active AFS-400 2020-01-13
120-108A Continuous Descent Final Approach

This AC describes how to use a continuous descent final approach (CDFA) technique on a Nonprecision Approach (NPA), as well as recommended general procedures and training guidelines for implementing CDFA as a standard operating procedure (SOP).

Active AFS-400 2023-03-22
120-76E Authorization for Use of Electronic Flight Bags

This Flight Standards Service (FS) AC contains guidance on the operational use of Electronic Flight Bags (EFB).

Active AFS-400 2024-06-12
90-114B Automatic Dependent Surveillance-Broadcast Operations with Change 1

The intent of this AC is to facilitate operations using Automatic Dependent Surveillance-Broadcast (ADS-B) technology in compliance with Title 14 of the Code of Federal Regulations (14 CFR) part 91, §§ 91.225 and 91.227.

Active AFS-400 2019-12-30
89-3 FAA-Recognized Identification Areas

This AC provides guidance on applying for a Federal Aviation Administration (FAA)-Recognized Identification Area (FRIA), in accordance with Title 14 of the Code of Federal Regulations (14 CFR) Part 89, Remote Identification of Unmanned Aircraft, subpart C.

Active AFS-400 2022-10-19
00-63B Use of Flight Deck Displays of Digital Weather and Aeronautical Information

This AC provides guidance to flightcrew members and other airmen on the best practices for the use of data link to access Flight Information Services (FIS).

Active AFS-400 2024-06-03
120-41 Criteria for Operational Approval of Airborne Wind Shear Alerting and Flight Guidance

Establishes an acceptable means, but not the only means, of obtaining operational approval of an airborne wind shear alerting and flight guidance system.

Active AFS-400 1983-11-07
120-118 Criteria for Approval/Authorization of all Weather Operations for Takeoff, Landing, and Rollout

This advisory circular (AC) provides an acceptable means, but not the only means, for obtaining and maintaining authorization of operations in Category (CAT) I, CAT II, and CAT III landing weather minima and instrument flight rules (IFR) lower-than-standard takeoff minima.

Active AFS-400 2018-07-02