General Electric J31
| J31 | |
|---|---|
| General Electric J31 turbojet engine | |
| Type | Turbojet | 
| National origin | United States | 
| Manufacturer | General Electric | 
| First run | April 1943 | 
| Major applications | P-59 Airacomet Ryan FR Fireball | 
| Number built | 241 | 
| Developed from | General Electric I-A | 
| Developed into | General Electric I-40/Allison J33 | 
The General Electric J31 was the first jet engine to be mass-produced in the United States.