55 built.[33] Fairey IIIF Mk.II Three-seat spotter-reconnaissance biplane, powered by a Napier Lion XIA W-12 piston engine, of composite wood and metal construction; 33 built.[33] Fairey IIIF Mk.III Three-seat spotter-reconnaissance biplane, powered by a Napier Lion XIA piston engine, with a fabric-covered all-metal structure; 291 built.[33] Fairey IIIF Mk.IV Two-seat general purpose biplane for the RAF, in both composite construction and all-metal versions.