Advisory circular (AC) refers to a type of publication offered by the Federal Aviation Administration (FAA) to provide guidance for compliance with [Airworthiness, pilot certification, operational standards, training standards, and any other rules within the 14 CFR Aeronautics and Space Title.]]. They define acceptable means, but not the only means, of accomplishing or showing compliance with airworthiness regulations. Generally informative in nature, Advisory Circulars are neither binding nor regulatory; yet some have the effect of de facto standards or regulations.
Advisory circulars typically refer to industry standards from SAE and RTCA. Some Advisory circulars are only a few pages long and do little more than reference a recommended standard; for example, AC 20-115B referencing DO-178B. Others, like AC 20-115C, are considerably longer; in this case giving guidance in how to transition from DO-178 revision B to C.
|Advisory Circular||Title||Referenced Standards|
|AC 20-115||Airborne Software Assurance||RTCA DO-178|
|AC 20-136||Aircraft Electrical and Electronic System Lightning Protection||RTCA DO-160 §22|
|AC 20-152||Design Assurance Guidance for Airborne Electronic Hardware||RTCA DO-254|
|AC 20-170||Integrated Modular Avionics Development. Verification, Integration and Approval||RTCA DO-297|
|AC 20-1317||The Certification of Aircraft Electrical and Electronic Systems for Operation in the High Radiated Fields (HIRF) Environment|
|AC 25.1309-1||System Design and Analysis||ARP4754, ARP4761|
|AC 43.13-1B||Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair|
|AC 70-1||Outdoor Laser Operations|
|AC 91-57||Model Aircraft Operating Standards (relevant to Regulation of UAVs in the United States)|
- Airworthiness Directive (in comparison, airworthiness directives are legally enforceable rules)
- David B. Walen FAA, Civil Aircraft System Safety and Electromagnetic Compatibility, November 16, 2010, p. 6
- Approach, Volume 31, Issue 3, Naval Safety Center, 1985 - Aeronautics, p. 25.
- AC 20-115B
- AC 20-115C Archived 2014-09-03 at the Wayback Machine.
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