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. 20,206 are on file, 291 of them issued as emergencies, 298 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.
2 orders on heating, ice protection and utility systems on the Learjet 25 family newest first
The list behind a number on the Learjet 25 page. Every order.
| Order | In force | Applies to | What it is about | System |
|---|---|---|---|---|
| 2005-23-06 | 2005-12-19 | Learjet Inc. 23, 24, 24A, 24B and 11 more | Thrust reverser hydraulic system | Heating, ice protection and utility systems |
| 2005-23-03 | 2005-12-19 | Learjet Inc. 23, 24, 24A, 24B and 13 more | Spherical accumulator for the main hydraulic system | Heating, ice protection and utility systems |
Source: FAA airworthiness directives (final rules and emergency directives) from the FAA's Dynamic Regulatory System, as of October 26, 2026. The FAA's text is the authority; this site adds the links to models, engines and the register. Related: aircraft systems · type certificates.