Model Variants (Including Prototypes)
PE - Private Venture Prototype Model
Army Type 97 Fighter Model A - Service Model Designation.
Ki-27a - Production Model Company Designation; fitted with uprated Ha-1b engine with faired-metal canopy.
Ki-27b - Provision for ground attack role in the form of 4 x underwing hardpoints; "clear-vision" canopy.
Ki-27 KAI - Experimental Lightweight Fighter Variant.