converting Embraer EMB 820Cs by installing Pratt & Whitney Canada PT6 turboprop engines; Neiva called the converted aircraft the Carajá. Variants Initial production version, also known unofficially as the PA-31-310. PA-31-300 Navajo Variant of the Navajo with normally aspirated engines; 14 built. PA-31 Navajo B Marketing name for 1971 improved variant with Lycoming TIO-540-E turbo-charged piston engines, new airconditioning and optional pilot access door and optional wide utility door. PA-31 Navajo C Marketing name for 1974 improved variant with Lycoming TIO-540-A2C engines and other minor improvements. PA-31P Pressurized Navajo Pressurized version of the PA-31 Navajo, powered by two 425-hp (317-kW) Lycoming TIGO-541-E1A piston engines. Referred to as the "Navajo C/R" for Counter-rotating; variant of Navajo with counter-rotating engines introduced with the PA-31-350 Chieftain. Lycoming TIO-540 / LTIO-540 engines Stretched version of the Navajo with more powerful 350-hp (261-kW) counter-rotating engines (a Lycoming TIO-540 and a Lycoming LTIO-540) to eliminate critical engine issues. PA-31P-350 Mojave Piston-engined variant of the PA-31T1 Cheyenne I; 50 aircraft built. PA-31-350T1020 Also known as the T1020/T-1020; variant of the PA-31-350 Chieftain optimised for commuter airline use, with less baggage and fuel capacity and increased seating capacity (nine passengers). First flight September 25, 1981. 21 built. PA-31T3 Also known as the T1040/T-1040; turboprop-powered airliner with fuselage of the PA-31-350T1020, and wings, tail and Pratt & Whitney Canada PT6A-11 engines of PA-31T Cheyenne. First flight July 17, 1981. 24 built. PA-31-353 Experimental version of PA-31-350; two built. T1050 Unbuilt airliner variant with fuselage lengthened by compared to the PA-31-350. EMB 820C Version of Chieftain built under license by Embraer in Brazil. Neiva Carajá Turboprop conversion of EMB 820C, fitted with two Pratt & Whitney Canada PT6A-27 engines flat-rated to 550shp. The Carajá's MTOW of was more than that of the Chieftain. Colemill Panther Re-engined Navajo with Lycoming TIO-540-J2B engines, four-blade Hartzell "Q-Tip" propellers and optional winglets. Conversion designed by Colemill Enterprises of Nashville, Tennessee. The supplemental type certificates (STCs) were subsequently sold to Mike Jones Aircraft Sales, which continues to convert PA-31, PA-31-325 and PA-31-350 variants with Colemill-developed features. Operators Civil The Navajo family is popular with air charter companies and small feeder airlines in many countries, and is also operated by private individuals and companies. Military Chile Chilean Navy purchased a single PA-31 in 1971. Colombia Colombian Air Force Colombian Navy Dominican Republic Dominican Republic Air Force operates two PA-31s as of December 2018. Finland Finnish Air