| Designation | Modified Role | Location | Serial / Regist. |
|---|---|---|---|
| C-18A |   |   | |
| C-18B |   |   | |
| EC-18B | Special electronic installation |   |   |
| EC-18C | Special electronic installation |   |   |
| EC-18D | Special electronic installation |   |   |
| TC-18E | Trainer |   |   |
| TC-18F | Trainer |   |   |