Advisory Circulars
1,859 indexed · 779 current · 1,080 cancelled · 222 series
By subject series
- Series 20 208 ACs
- Series 120 193 ACs
- Series 91 91 ACs
- Series 150/5345 86 ACs
- Series 90 77 ACs
- Series 21 76 ACs
- Series 61 71 ACs
- Series 00 55 ACs
- Series 121 42 ACs
- Series 43 41 ACs
- Series 23 38 ACs
- Series 25 38 ACs
- Series 150/5200 38 ACs
- Series 150/5340 38 ACs
- Series 65 37 ACs
- Series 150/5210 36 ACs
- Series 150/5220 34 ACs
- Series 150/5370 31 ACs
Most recent current ACs
- 2026-01-30 AC 21-12D Application for U.S. Airworthiness Certificate Part 21
- 2026-01-23 AC 136-5 Enhanced Flight Following Center (EFFC) for Commercial Air Tour Operators Part 136
- 2026-01-13 AC 90-23H Aircraft Wake Vortex Encounter Risk Mitigation Part 91
- 2026-01-13 AC 135-45A Use of Noncertified Weather Observations in Noncontiguous States Part 135
- 2025-11-14 AC 65-32B Certification of Repairmen (Light-Sport) Part 65
- 2025-11-14 AC 61-65K Certification: Pilots and Flight and Ground Instructors Part 61
- 2025-11-14 AC 61-146 Pilot Certification and Operations for Sport Pilots, Flight Instructors with a Sport Pilot Rating, and Simplified Flight Controls Part 61
- 2025-10-01 AC 187-1U Flight Standards Service Schedule of Charges Outside the United States Part 187
- 2025-09-29 AC 20-135A Powerplant Installation and Propulsion System Component Fire Protection Test Methods, Standards, and Criteria Part 21, 23+5
- 2025-09-25 AC 21-32C Control of Prepositioned Products and Articles Shipped Prior to Design Approval Part 21
- 2025-09-22 AC 43-9D Maintenance Records and FAA Form 8130-3 Return to Service Part 43
- 2025-09-11 AC 120-53C Flight Standardization Board Evaluations Part 91, 119+4
- 2025-09-08 AC 33-12 Geometry and Dimensional Considerations for Comparative Test and Analysis for Turbine Engine and Auxiliary Power Unit (APU) Replacement, and Repaired Parts Part 33
- 2025-09-08 AC 33.15-1A Manufacturing Process of Premium Quality Titanium Alloy Rotating Engine Components Part 33
- 2025-09-08 AC 20-167B Airworthiness Approval of Enhanced Vision System, Enhanced Flight Vision System, and Combined Vision System Equipment Part 21, 23+5
- 2025-07-18 AC 21.17-4 Type Certification----Powered-lift Part 21
- 2025-06-26 AC 150/5220-10F Guide Specification for Aircraft Rescue and Fire Fighting (ARFF) Vehicles Part 139
- 2025-06-24 AC 91-57D Exception for Limited Recreational Operations of Unmanned Aircraft Part 91
- 2025-06-18 AC 20-197 Turbine Engine and Airframe Sensor Icing Compliance Part 21, 23+5
- 2025-06-04 AC 120-105B Foreign Terminal Instrument Procedures (FTIP) Acceptance/Review Part 91, 119+4
- 2025-05-20 AC 33.17-1B Engine Fire Protection § 33.17 Part 33
- 2025-05-15 AC 150/5200-34B Construction or Establishment of Landfills Near Public Airports Part 139
- 2025-04-08 AC 120-126A Guidelines to Establish, Implement, and Maintain a DOT/FAA Drug and Alcohol Testing Program Part 91, 119+4
- 2025-04-03 AC 91-70D Oceanic and Remote Continental Airspace Operations Part 91
- 2025-03-11 AC 450.45-2 Compliance when Contracting with a Federal Entity Part 450