What the FAA has ordered
An airworthiness directive is an order: when the FAA finds an unsafe condition in a design, it tells the owners of every aircraft, engine or propeller of that design what to inspect, repair or replace, and by when. 20,218 are on file, 291 of them issued as emergencies, 310 so far this year. Each one here is linked to the model families and engine series it names, with the number of aircraft on the register today.
292 orders from 1991 newest first
| Order | In force | Applies to | What it is about | System |
|---|---|---|---|---|
| 91-25-03 R1 | 1991-12-31 | The Boeing Company DC-9-11, DC-9-12, DC-9-13, DC-9-14 and 14 more | Main Landing Gear Brakes | Landing gear |
| 91-25-10 | 1991-12-27 | The Boeing Company DC-10-10 | Forward Lower Pressure Bulkhead | Airframe structure |
| 91-26-02 | 1991-12-23 | Bombardier Inc. DHC-8-102, DHC-8-103 | AFM Changes - Engine Bleed Air | Engine |
| 91-25-09 | 1991-12-23 | Embraer S.A. EMB-110P1, EMB-110P2 | Elevator Trim Tab Actuator Support | Flight controls |
| 91-24-13 | 1991-12-20 | Sikorsky Aircraft Corporation S-76A | Vertical Pylon Forward Spar Cap and Web | Airframe structure |
| 91-23-16 | 1991-12-20 | Aerostar Aircraft Corporation PA-60-700P (Aerostar 700P) | Manifold Pressure Operations | Other and general |
| 91-25-06 | 1991-12-18 | The Boeing Company 737-300 Series, 737-400 Series, 737-500 Series | Thrust Reverser Auxiliary Track | Other and general |
| 91-25-05 | 1991-12-18 | Gulfstream Aerospace Corporation G-1159A, G-IV | Electrical Feeder Cable | Electrical power |
| 91-23-08 | 1991-12-18 | Mitsubishi Heavy Industries, Ltd. MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-30 and 1 more | Rudder Trim Tab | Flight controls |
| 91-23-06 | 1991-12-17 | F.28 Mark 0100, F.28 Mark 1000, F.28 Mark 2000, F.28 Mark 3000 and 1 more | Horizontal Stabilizer Attach Fittings | Airframe structure |
| 91-23-05 | 1991-12-17 | F.28 Mark 0100 | Aileron/Rudder Servomounts | Flight controls |
| 91-22-08 | 1991-12-13 | The Boeing Company 727-100 Series, 727-100C Series, 727-200 Series, 727-200F Series and 2 more | Main Landing Gear Wheel Well Pressure | Landing gear |
| 91-24-08 | 1991-12-12 | The Boeing Company MD-11, MD-11F | Outboard Flaps | Flight controls |
| 91-25-01 | 1991-12-10 | Gulfstream Aerospace LP 1125 Westwind Astra | Horizontal Stabilizer Trim | Flight controls |
| 91-23-03 | 1991-12-10 | APEX Aircraft CAP 10 B | Fuel System | Fuel system |
| 91-23-02 | 1991-12-10 | Aviat Aircraft Inc A-1 | Carburetor Air Intake Box | Engine |
| 91-23-12 | 1991-12-09 | Lockheed Martin Corporation L-1011-385-1, L-1011-385-1-14, L-1011-385-1-15, L-1011-385-3 | Main Landing Gear Braking Effectiveness | Landing gear |
| 91-23-01 | 1991-12-03 | Textron Aviation Inc. 77 | Nose Landing Gear Fork | Landing gear |
| 91-22-07 | 1991-12-03 | The Boeing Company DC-9-11, DC-9-12, DC-9-13, DC-9-14 and 14 more | MLG Outboard Door | Airframe structure |
| 91-22-05 | 1991-11-29 | The Boeing Company 747-100 Series, 747-100B Series, 747-100B SUD Series,... and 5 more | Stowage Bins | Other and general |
| 91-22-04 | 1991-11-29 | The Boeing Company 707-100 Long Body, 707-100B Long Body, 707-100B Short... and 8 more | Main Cargo Door | Airframe structure |
| 91-21-13 | 1991-11-29 | The Boeing Company 737-300 Series, 737-400 Series, 737-500 Series | Fuel Shutoff Cable Pulley Bracket | Other and general |
| 91-21-10 | 1991-11-29 | The Boeing Company 767-200 Series, 767-300 Series, 767-300F Series | Leading Edge Slats | Other and general |
| 91-21-09 | 1991-11-29 | Piper Aircraft Inc. PA-24-260 | Air Induction System | Other and general |
| 91-21-03 | 1991-11-29 | The Boeing Company DC-9-11, DC-9-12, DC-9-13, DC-9-14 and 18 more | Electrical Wiring | Electrical power |
| 91-23-09 | 1991-11-27 | The Boeing Company 747-400 Series, 747-400D Series | Electrical Power System | Electrical power |
| 91-20-02 | 1991-11-25 | General Electric Company CF6-80C2A1, CF6-80C2A2, CF6-80C2A3, CF6-80C2A5 and 11 more | Fuel Manifolds | Engine |
| 91-17-01 | 1991-11-25 | Textron Aviation Inc. 35-33, 35-A33, 35-B33, 35-C33 and 39 more | Elevator Trim Tab Actuators | Flight controls |
| 91-23-13 | 1991-11-22 | General Electric Company CF6-50A, CF6-50C, CF6-50C1, CF6-50C2 and 11 more | Fan Disks | Engine |
| 91-21-08 | 1991-11-19 | Airbus SAS BAC 1-11 200 Series, BAC 1-11 400 Series | Tailplane Lower Skin Panel | Airframe structure |
| 91-21-07 | 1991-11-19 | The Boeing Company DC-9-11, DC-9-12, DC-9-13, DC-9-14 and 19 more | Trim Relays | Flight controls |
| 91-21-06 | 1991-11-19 | BAE Systems (Operations) Limited BAe 146-100A, BAe 146-200A, BAe 146-300A | Engine/Nose Cowl | Engine |
| 91-21-04 | 1991-11-19 | Airbus SAS BAC 1-11 200 Series, BAC 1-11 400 Series | Inspect For Cracks | Airframe structure |
| 91-20-10 | 1991-11-14 | Scotts-Bell 47 Inc 47G-2, 47G-2A, 47G-2A-1, 47G-3 and 10 more | Main Rotor Grip | Rotorcraft systems |
| 91-22-06 | 1991-11-12 | Vulcanair S.p.A. P 68, P 68 Observer, P 68B, P 68C and 2 more | Placard Operating Limitations | Other and general |
| 91-21-12 | 1991-11-12 | The Boeing Company 737-100 Series, 737-200 Series, 737-200C Series, 737-300 Series and 12 more | Radio Control Panels | Instruments and avionics |
| 91-18-10 | 1991-11-12 | The Boeing Company 767-200 Series, 767-300 Series, 767-300F Series | Brake Wear Limits | Landing gear |
| 91-20-06 | 1991-11-07 | The Boeing Company 747-100 Series, 747-100B Series, 747-100B SUD Series,... and 2 more | Engine Fire Extinguishing System | Engine |
| 91-20-05 | 1991-11-07 | Airbus SAS BAC 1-11 200 Series, BAC 1-11 400 Series | Inspect Skin & Cleats | Airframe structure |
| 91-20-04 | 1991-11-07 | The Boeing Company 737-300 Series, 737-400 Series, 737-500 Series | Stabilizer Trim Assembly | Flight controls |
| 91-18-14 | 1991-11-07 | BAE Systems (Operations) Limited BAe 146-100A, BAe 146-200A, BAe 146-300A | Passenger and Service Doors | Cabin, seats and restraints |
| 91-22-01 | 1991-11-04 | Cessna Aircraft Company 210, 210-5 (205), 210-5A (205A), 210A and 13 more | Electrical Wires | Electrical power |
| 91-20-08 | 1991-10-31 | Textron Aviation Inc. A36, A36TC, B36TC, F33A and 2 more | Fresh Air Blower Housing | Other and general |
| 91-21-11 | 1991-10-30 | McDonnell Douglas Corporation DC-9-81, DC-9-82, DC-9-83, DC-9-87 and 1 more | Slat Drive Mechanism Brackets | Other and general |
| 91-21-05 | 1991-10-23 | McDonnell Douglas Corporation, McDonnell Douglas Corporation DC-10-10, DC-10-10F, DC-10-15, DC-10-30 and 3 more | Wing Rear Spar | Airframe structure |
| 91-21-02 | 1991-10-23 | The Boeing Company DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83),... | Management Control Units | Other and general |
| 91-18-19 | 1991-10-21 | Hawker Beechcraft Corporation, Hawker Beechcraft Corporation 58 Model or Series (all), 58A, 58P, 58PA and 10 more | Pilot Shoulder Harnesses | Other and general |
| 90-03-10 | 1991-10-18 | Arrow Falcon Exporters, Inc., AST, Inc UH-1H, UH-1F, 204B, 205A and 32 more | Tail Rotor Grips | Rotorcraft systems |
| 90-13-01 R1 | 1991-10-17 | Bell Helicopter Textron Canada Limited 206B, 206L, 206L-1, 206L-3 | Tail Rotor Blade Assembly | Rotorcraft systems |
| 91-18-13 | 1991-10-16 | Short Brothers PLC SD3-30, SD3-60 | Pitot/Static Heaters | Instruments and avionics |
Source: FAA airworthiness directives (final rules and emergency directives) from the FAA's Dynamic Regulatory System, as of November 9, 2026. The FAA's text is the authority; this site adds the links to models, engines and the register. Related: aircraft systems · type certificates.