Specification for Runway and Taxiway Signs
This AC contains the FAA specifications for unlighted and lighted signs to be used on taxiways and runways.
Pilot Guide: Flight In Icing Conditions
This advisory circular (AC) contains updated and additional information for the pilots of airplanes under Title 14 of the Code of Federal Regulations (14 CFR) parts 91, 121, 125, and 135. The purpose of this AC is to provide pilots with a convenient reference guide on the principal factors related to flight in icing conditions and the location of additional information in related publications. As a result of these updates and consolidating of information, AC 91-74A, Pilot Guide: Flight in Icing Conditions, dated December 31, 2007, and AC 91-51A, Effect of Icing on Aircraft Control and Airplane Deice and Anti-Ice Systems, dated July 19, 1996, are cancelled. This AC does not authorize deviations from established company procedures or regulatory requirements.
Guidance on Testing and Installation of Rechargeable Lithium Battery and Battery Systems on Aircraft
The guidance in this AC is intended for manufacturers, installers, maintenance personnel, and users of installed rechargeable lithium batteries and battery systems on aircraft. As with all advisory material, this AC is not mandatory and does not constitute a regulation. It is issued for guidance purposes and to outline a means of compliance with applicable airworthiness requirements.
This advisory circular (AC) provides manufacturers and installers with an acceptable means of compliance to meet the installation, operation, maintenance and airworthiness requirements for installation of lithium batteries on aircraft (14 CFR part 21, 23, 25, 27 and 29).
Specification for Airport Light Bases, Transformer Housings, Junction Boxes, and Accessories
This advisory circular contains the specifications for airport light bases, transformer housings, junction boxes, accessories, elevated light fixture covers and stakes. It is not intended to be a compilation of currently available product designs. Instead, it provides the basic standard requirements for critical dimensions and performance requirements to which all manufacturers must demonstrate compliance.