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.
20,218 orders newest first
| Order | In force | Applies to | What it is about | System |
|---|---|---|---|---|
| 53-20-01 | Martin-Marietta Corporation 202, 202A | Hamilton Std. Propeller Pitch Stop | Propeller | |
| 53-19-01 | The Boeing Company C54-DC, DC-4 | Generator Cooling Fan | Electrical power | |
| 53-18-01 | Cessna Aircraft Company T-50 | Goodrich Wheel Bearing | Landing gear | |
| 53-17-01 | Mooney Mite Aircraft Corporation M-18C, M-18C 55, M-18L, M-18LA | Control Stick Boot | Other and general | |
| 53-16-01 | Alexandria Aircraft, LLC 14-19, 14-19-2, 14-19-3, 14-19-3A | Elevator Trim Tab Looseness | Flight controls | |
| 53-15-03 | Hartzell Propeller, Inc. HC-82XF-1 | Link Screws | Propeller | |
| 53-15-02 | Lockheed Aircraft Corporation 149-46, 49-46, 649-79, 649A-79 and 2 more | Wing Lower Front Spar Cap | Airframe structure | |
| 53-13-01 | Rolls-Royce Limited Gipsy Queen 70-4, Gipsy Queen 70 MK2, Gipsy Queen 70 MK3 | Oil Transfer Mechanism | Engine | |
| 53-12-02 | Viking Air Limited DHC-2 Mk.I, DHC-2 Mk.II, DHC-2 Mk.III | Hydraulic Hand Pump Seals | Heating, ice protection and utility systems | |
| 53-12-01 | Hiller Aviation UH-12, UH-12A, UH-12B | Horizontal Stabilizer Spar | Airframe structure | |
| 53-11-02 | Viking Air Limited DHC-2 Mk.I, DHC-2 Mk.II, DHC-2 Mk.III | Engine Oil Sump Chafing | Engine | |
| 53-10-02 | Viking Air Limited DHC-2 Mk.I, DHC-2 Mk.II, DHC-2 Mk.III | Wing Skin Cracks | Airframe structure | |
| 53-10-01 | Airlift International, Inc., Curtiss-Wright Corporation C-46A, C-46D, C-46F, C-46R and 11 more | Vacuum Pump Discharge Port | Heating, ice protection and utility systems | |
| 53-09-04 | Continental W-670-9A | Propeller Blades | Engine | |
| 53-09-03 | Hiller Aviation UH-12, UH-12A, UH-12B | Outboard Tension Bar Pins | Other and general | |
| 53-09-02 | Viking Air Limited DHC-2 Mk.I, DHC-2 Mk.II, DHC-2 Mk.III | Fuselage Skin Cracks | Airframe structure | |
| 53-09-01 | Pratt & Whitney Division Military R-2000 Series | Link Pins | Engine | |
| 53-08-02 | The Boeing Company DC-6, DC-6A, DC-6B | Center Wing Skin And Stringers | Airframe structure | |
| 53-08-01 | Sierra Hotel Aero, Inc. Navion (Army L-17A), Navion A (Army L-17B and L-17C), Navion B | Horizontal Stabilizer Fitting | Airframe structure | |
| 53-07-01 | Viking Air Limited DHC-2 Mk.I, DHC-2 Mk.II, DHC-2 Mk.III | Elevator Hinge Attachment | Flight controls | |
| 53-06-01 | Cessna Aircraft Company T-50 | Landing Light Motor Circuit | Electrical power | |
| 53-03-01 | Sierra Hotel Aero, Inc. Navion B | Hartzell Propeller Vibration | Propeller | |
| 53-01-02 | Textron Aviation Inc. 35, A35, B35, C35 | Fuel Selector Valve Rework | Engine | |
| 53-01-01 | Scotts-Bell 47 Inc 47D1 | Gearbox Mounting Sleeve | Other and general | |
| 52-29-01 | Hiller Aviation UH-12, UH-12A, UH-12B | Tail Rotor Drive Slip Joint Assembly Inspection | Rotorcraft systems | |
| 52-28-05 | The Boeing Company DC-6, DC-6A, DC-6B | Center Wing Lower Access Hole | Airframe structure | |
| 52-28-04 | Scotts-Bell 47 Inc 47B, 47B3, 47D, 47D1 | Tail Rotor Pinion Shaft | Rotorcraft systems | |
| 52-28-03 | Scotts-Bell 47 Inc 47, 47B, 47B3, 47D and 20 more | Tail Rotor Gearbox Shaft | Rotorcraft systems | |
| 52-28-02 | Bellanca Aircraft Corporation 14-13, 14-13-2, 14-13-3 | Fuel Pump Relief Valve | Engine | |
| 52-28-01 | American Champion Aircraft Corp. 11AC, S11AC | Fuel Transfer Placard | Other and general | |
| 52-27-02 | The Boeing Company DC-6, DC-6A, DC-6B | Outboard Front Spar Splice Plate | Airframe structure | |
| 52-26-01 | Sierra Hotel Aero, Inc. Navion (Army L-17A), Navion A (Army L-17B and L-17C), Navion B | Stabilizer Spar Web | Airframe structure | |
| 52-25-02 | Univair Aircraft Corporation 415-C, 415-CD | Nose Wheel and Skis. | Landing gear | |
| 52-25-01 | The Boeing Company DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A and 10 more | Vacuum System Rework | Heating, ice protection and utility systems | |
| 52-24-01 | Sierra Hotel Aero, Inc. Navion (Army L-17A), Navion A (Army L-17B and L-17C), Navion B | Aileron Control Chain Guard | Flight controls | |
| 52-23-01 | Edison Fire Detectors | Fire Detectors | Other and general | |
| 52-21-01 | Scotts-Bell 47 Inc 47, 47B, 47B3, 47D and 20 more | Lord Mount Guards | Other and general | |
| 52-20-02 | Curtiss-Wright/Marquette, Inc. Double Row Cyclone 739C18BA3, Double Row Cyclone... and 1 more | Master Rod Bearing Oil Supply | Engine | |
| 52-20-01 | The Boeing Company DC-6, DC-6A, DC-6B | Overvoltage Protection | Other and general | |
| 52-19-01 | Airlift International, Inc., Curtiss-Wright Corporation C-46A, C-46D, C-46F, C-46R and 11 more | Cabin Heater Installation | Cabin, seats and restraints | |
| 52-18-02 | The Boeing Company DC-6, DC-6A, DC-6B | Spar Cap Rework | Airframe structure | |
| 52-18-01 | Airlift International, Inc., Curtiss-Wright Corporation C-46A, C-46D, C-46F, C-46R and 11 more | Carburetor Adapter Gasket | Engine | |
| 52-17-02 | Airlift International, Inc., Curtiss-Wright Corporation C-46A, C-46D, C-46F, C-46R and 11 more | Wheel Shimmy Damper Support | Landing gear | |
| 52-17-01 | Bellanca Aircraft Corporation 14-13, 14-13-2, 14-13-3, 14-13-3W | Landing Gear Chain Guard | Landing gear | |
| 52-16-02 | Martin-Marietta Corporation 404 | Propeller Reversing Rework | Propeller | |
| 52-16-01 | Martin-Marietta Corporation 202A | Propeller Reversing Solenoid Valves | Propeller | |
| 52-15-02 | Martin-Marietta Corporation 202 | Propeller Reversing Rework | Propeller | |
| 52-14-02 | Kelowna Flightcraft R & D Ltd. 240 Series, 340 | Electrical Circuits | Electrical power | |
| 52-14-01 | The Boeing Company DC-6, DC-6A, DC-6B | Propeller Reversing Rework | Propeller | |
| 52-13-02 | Lockheed Aircraft Corporation 49-46 | Propeller Reversing Rework | Propeller |
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.