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Number Office Title Date
20-67B AIR-120 Airborne VHF Communication Equipment Installations 01-16-1986
20-68B AFS-600 Recommended Radiation Safety Precautions for Ground Operation of Airborne Weather Radar Sets forth recommended radiation safety precautions for ground operation of airborne weather radar. 08-08-1980
20-69 AIR-120 Conspicuity of Aircraft Instrument Malfunction Indicators Provides design guidance information on methods of improving conspicuity of malfunction indication devices. 05-14-1970
20-71 AIR-120 Dual Locking Devices on Fasteners Provides guidance and acceptable means, not the sole means, by which compliance may be shown with the requirements for dual locking devices on removable fasteners installed in rotorcraft and transport category airplanes. 12-08-1970
20-73A AIR-120 Aircraft Ice Protection Provides information relating to the substantiation of ice protection systems on aircraft. 08-16-2006
20-74 AIR-120 Aircraft Position and Anticollision Light Measurements Contains useful information concerning measurements for intensity, covering, and color of aircraft position and anti-collision lights. 07-29-1971
20-76 AFS-330 Maintenance Inspection Notes for Boeing Provides maintenance inspection notes which can be used for the maintenance support program for certain structural parts of the B-707/720 series aircraft. 10-21-1971
20-77A AFS-350 Use of Manufacturers' Maintenance Manuals Informs owners and operators about the usefulness of manufacturers’ maintenance manuals for servicing, repairing, and maintaining aircraft, engines and propellers. 04-06-2007
20-88A ANM-110 Guidelines on the Marking of Aircraft Provides revised guidelines on the marking of aircraft powerplant instruments and electronic displays (cathode ray tubes, etc.). These guidelines offer acceptable, but not exclusive, methods of compliance with the powerplant instrument color marking requirements. 09-30-1985
20-94A AFS-350 Digital Clock Installation in Aircraft 04-13-2007
20-96 AIR-200 Surplus Military Aircraft: A Briefing for Prospective Buyers Provides many answers to questions regarding the purchasing of surplus military aircraft (type certification, is the aircraft flyable, is it sold for spare parts, scrap?). 12-02-1976
20-97B AFS-306 Aircraft Tire Maintenance and Operational Practices This advisory circular (AC) provides recommended tire care and maintenance practices needed to assure the safety of support personnel and the continued airworthiness of aircraft. Specifically, this AC provides guidance on the installation, inflation, maintenance, and removal of aircraft tires. In addition, this AC provides guidance on those operational practices necessary to maintain safe aircraft operations. This AC is not mandatory and does not constitute a regulation. It is issued for guidance purposes and to outline acceptable tire maintenance and operational practices. In lieu of following this method without deviation, operators may elect to follow an alternative method that has also been found acceptable by the Federal Aviation Administration (FAA). 04-18-2005
20-99 ANM-100 Antiskid and Associated Systems Provides an acceptable means, but not the only means, of complying with the requirement that anti-skid and associated systems must be designed so that no probable malfunction will result in a hazardous loss of braking or directional control of an airplane. 05-27-1977
20-100 AIR-120 General Guidelines for Measuring Fire-Extinguishing Agent Concentrations in Powerplant Compartments Describes the installation and use of a model GA-2A fire extinguisher agent concentration recorder in determining the distribution and concentration of fire-extinguishing agents when discharged in an aircraft powerplant compartment. 09-21-1977
20-103 AFS-340 Aircraft Engine Crankshaft Failure Provides information and suggests procedures to increase crankshaft service life and to minimize failures. 03-07-1978
20-104 AIR-120 Revised Powerplant Engineering Report No. 3A Standard Fire Test Apparatus and Procedure (for Flexible Hose Assemblies) Announces the availability of the subject report. 07-19-1978
20-105B AFS-340 Reciprocating Engine Power-Loss Accident Prevention and Trend Monitoring Updates statistical information and brings to the attention of aircraft owners, operators, manufacturers, and maintenance personnel the circumstances surrounding engine power-loss accidents with recommendations on how those accidents can be prevented. 06-15-1998
20-106 AFS-340 Aircraft Inspection for the General Aviation Aircraft Owner Describes techniques used in aircraft inspections. Designed to familiarize owner, pilots, student mechanics, and others with inspection procedures, it does NOT qualify an individual to make airworthiness determinations. 04-01-1978
20-107B AIR-100 Composite Aircraft Structure

This AC sets forth an acceptable means, but not the only means of showing compliance with the provisions of Title 14 of the Code of Federal Regulations (14 CFR) parts 23, 25, 27, and 29 regarding airworthiness type certification requirements for composite aircraft structures involving fiber reinforced materials, e.g., carbon and glass fiber reinforced plastics. Guidance information is also presented on the closely related design, manufacturing, and maintenance aspects. The information contained herein is for guidance purposes and is not mandatory or regulatory in nature. 

20-109A AFS-620 Service Difficulty Program (General Aviation) Describes the Service Difficulty Program as it applies to general aviation activities. Instructions for completion of the revised FAA Form 8010-4 (10-92), Malfunction or Defect Report, are provided. 04-08-1993
20-111 AFS-350 Communication Interference Caused by Unintentional Keyed Microphones Alerts the aviation community to the potential hazards created by unintentional keying of microphones resulting in radio transmissions from airborne, mobile, and ground based radio transmitters and gives guidance on alleviating ensuing hazards. 10-10-1980
20-113 ACE-100 Pilot Precautions and Procedures to be taken in Preventing Aircraft Reciprocating Engine Induction System and Fuel System Icing Problems Provides information pertaining to aircraft engine induction system icing and the use of fuel additives to reduce the hazards of aircraft operation that may result from the presence of water and ice in aviation gasoline and aircraft fuel systems. 10-22-1981
20-114 AIR-100 Manufacturers' Service Documents Suggests acceptable methods by which product manufacturers may indicate FAA approval of recommended actions prescribed in manufacturers’ service documents. 10-22-1981
20-115C AIR-120 Airborne Software Assurance

a. This AC describes an acceptable means, but not the only means, for showing compliance with the applicable airworthiness regulations for the software aspects of airborne systems and equipment certification. This AC is not mandatory and is not a regulation. Other ACs may describe alternate means.

b. We, the Federal Aviation Administration (FAA), wrote this AC to recognize the following RTCA, Inc. documents (RTCA DO):

 (1) RTCA DO-178C, Software Considerations in Airborne Systems and Equipment Certification, dated December 13, 2011.

(2) RTCA DO-330, Software Tool Qualification Considerations, dated December 13, 2011.

(3) RTCA DO-331, Model-Based Development and Verification Supplement to DO­178C and DO-278A, dated December 13, 2011.

(4) RTCA DO-332, Object-Oriented Technology and Related Techniques Supplement to DO-178C and DO-278A, dated December 13, 2011.

(5) RTCA DO-333, Formal Methods Supplement to DO-178C and DO-278A, dated December 13, 2011.

Note: RTCA DO is hereafter referred to as DO.

c. References to use of DO-178C in this AC include use of supplements and DO-330 as applicable.

d. This AC also establishes guidance for transitioning to DO-178C when making modifications to software previously approved using DO-178, DO-178A, or DO-178B.

07/19/2013 AC 20-115C


e. This AC also explains the use of DO-178C for Technical Standard Order (TSO) authorizations.

f. This AC does not obligate the FAA to approve any data or perform any activities as specified within the referenced RTCA documents.


g. If you use the means in this AC as a means of compliance, you must follow it entirely.

20-116 ACE-100 Marking Aircraft Fuel Filler Openings with Color Coded Decals Discusses the conditions under which color coded decals may be used to comply with the requirements in FAR Parts 23, 25, 27, and 29 for marking fuel filler openings. 09-17-1982
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