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United States Department of TransportationUnited States Department of Transportation

Advisory Circulars (ACs)

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Advisory Circulars (ACs) search results
Number Title Status Office Date
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
120-114 Pilot Training and Checking (14 CFR Part 121 Subparts N and O, including Appendices E and F)

This advisory circular (AC) provides information regarding pilot training and checking under Title 14 of the Code of Federal Regulations (14 CFR) part 121 subparts N and O, including part 121 appendices E and F.

Active AFS-200 2016-09-29
91-90 Part 91 Approved Inspection Programs

This advisory circular (AC) prescribes the procedures to develop and submit aircraft owner- and operator-specific inspection programs in accordance with an inspection program selected under the provisions of Title 14 of the Code of Federal Regulations (14 CFR) part 91, § 91.409(f)(4), and satisfies the requirements of § 91.409(g) for review and approval by the Federal Aviation Administration (FAA).

Active AFS-300 2017-04-05
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
90-108 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
90-115 Collaborative Trajectory Options Program (CTOP)

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.

Active AJR-1 2014-06-24
90-116 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.

Active AFS-800 2014-09-23
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
120-90 Line Operations Safety Audits

Provides the rationale and procedure for conducting an Line Operations Safety Audit (LOSA) at an airline.

Active AFS-230 2006-04-27
90-95 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.

Active AFS-800 1995-02-07
90-99 High Altitude Airspace Redesign Phase 1 Active ATA-301 2003-09-22
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
90-80C Approval of Offshore Standard Approach Procedures, Airborne Radar Approaches, and Helicopter En Route Descent Areas

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
90-113B Instrument Flight Procedure Validation (IFPV) of Performance Based Navigation (PBN) Instrument Flight Procedures (IFP)

Active AFS-400 2019-03-20
90-110B Instrument Flight Procedure Service Provider Authorization Guidance for Space-based Instrument Flight Procedures

This advisory circular (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, space-based IFPs.

Active AFS-400 2019-03-20
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
90-50D Requirements for 760-Channel VHF Radio for Aeronautical Operations

Encourages aircraft owners to upgrade their air-ground radio communication systems. Describes and upgrades civil air traffic control frequencies in the very high frequency (118.000 to 136.975 MHz) band.

Active ASR-520 1992-04-09
90-67B Light Signals from the Control Tower for Ground Vehicles, Equipment, and Personnel

Provides the aviation community with the meaning of the light signals used when communicating with ground vehicles, equipment, and personnel on the airport movement area from the control tower.

Active ATP-129 1994-08-25
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
90-93B 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).

Active AJT-0 2013-04-22
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
90-112A 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.

Active AFS-400 2015-04-14
90-109A Transition to Unfamiliar Aircraft

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.

Active AFS-800 2015-06-29
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 AC does not apply to those approaches which require unique authorization (Required Navigation Performance Authorization Required (RNP AR), as described in AC 90 101( ), Approval Guidance for RNP Procedures with AR, nor does it address instrument approach procedures (IAP) using localizer performance with vertical guidance (LPV) or localizer performance without vertical guidance (LP), which are addressed in AC 90-107( ), Guidance for Localizer Performance with Vertical Guidance and Localizer Performance without Vertical Guidance Approach Operations in the U.S.

Active AFS-400 2016-03-07
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
90-102A 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).

Active AJR-1 2008-05-30
90-91K North American Route Program

Provides guidance to users of the National Air Space System for participation in the North American Route Program (NRP).

Active AJR-1 2008-12-11
90-48E Pilots’ Role in Collision Avoidance

This AC is issued to assist pilots with their regulatory obligation to see and avoid other aircraft.

Active AFS-800 2022-10-20
90-89C Amateur-Built Aircraft and Ultralight Flight Testing Handbook

This AC provides suggestions and safety-related recommendations primarily to assist amateur-built aircraft and ultralight vehicle builders in developing individualized flight test plans.

Active AFS-300 2023-02-14
90-66C Non-Towered Airport Flight Operations

This AC calls attention to regulatory requirements, recommended operations, and communications procedures for operating at an airport without a control tower or an airport with a control tower that operates only part time.

Active AFS-800 2023-06-06
33.90-1A Initial Maintenance Inspection (IMI), 14 CFR 33.90, Test for Turbine Engines

This advisory circular (AC) provides guidance to demonstrate compliance with Title 14 of the Code of Federal Regulations (14 CFR) 33.90, Initial Inspection Test.

Active ANE-111 2016-04-13