Model Variants (Including Prototypes)
Fo.141 - Base Fighter Model Designation
F.Mk 1 - Base Single Seat Fighter Design.
HAL Gnat - Indian license-production of F.Mk 1 model.
HAL Ajeet - Single-Seat Fighter; based on the F.1 model.
HAL Ajeet (Trainer) - Two-Seat Trainer used by India; based on the HAL Ajeet.
Fo.144 (Trainer) - Two-Seat Trainer Model Designation.
T.Mk 1 - Fo.144 trainer in service with RAF.