kit which increases the gross weight of the DHC-3 to on floats. Some aircraft were converted to turbine power using a PT6A, Walter 601 (manufactured in the Czech Republic), or Garrett/Honeywell TPE331-10, by Texas Turbine Conversions. The Walter M601E-11 Turbine Engine conversion is manufactured and installed by Stolairus Aviation. A Polish PZL radial engine has also been fitted. Re-engined aircraft have been offered since the 1980s by Airtech Canada as the DHC-3/1000 using current-production 1,000 hp (745 kW) PZL ASz-62 IR radials. Variants DHC-3 Otter Single-engined STOL utility transport aircraft. CSR-123 Otter STOL utility transport aircraft for the Royal Canadian Air Force. YU-1 Otter Six test and evaluation aircraft for the U.S. Army. U-1A Otter STOL utility transport aircraft for the U.S. Army. UC-1 Otter STOL utility transport aircraft for the United States Navy. Later redesignated U-1B Otter in 1962. Otters fitted with either Pratt & Whitney Canada PT6A-27 or Pratt & Whitney Canada PT6A-34 turboprop engine. Airtech Canada DHC-3/1000 OtterConversions powered by PZL Kalisz ASz-62IR engines. Texas Turbines Super OtterTurbine conversion powered by a Garret TPE331 turboprop engine Aerotech Industries Turbine conversion powered by a 900shp Pratt & Whitney Canada PT6A-140A turboprop engine. Military operators Argentine Air Force: Former operator Royal Australian Air Force: Two Otters (RAAF serial A100-1 and 2) were in service with the RAAF from 1961 to 1967. The aircraft were used for passenger and freight transport duties at the Weapons Research Establishment, Woomera, South Australia. No. 1 Air Trials Unit Bangladesh Air Force: Former operator Burma Air Force Royal Canadian Air Force Chilean Air Force Air Surveillance Service Ethiopian Air Force Ghana Air Force – acquired 12 Otters (G300 – G311), in service 1961-1973 (serial number: 413, 414, 416, 418, 420, 422, 424, 425, 426, 428, 430, 431). 4 aircraft had to be written off, 8 aircraft were sold in 1973. G300 (s/n 413) crashed on 21 June 1968 in the jungle in the Brong Ahafo region of Ghana and was destroyed. G301 (s/n 414) crashed on 31 August 1961 at Kintampo in the Brong Ahafo region of Ghana and was destroyed. G302 (s/n 416) crashed on the beach near Takoradi on a date unknown and was destroyed. It was on floats at the time, on a training detail. G308 (s/n 426) was written off in service. Indian Air Force Indonesian Air Force Khmer Air Force: Former operator Royal New Zealand Air Force Nicaraguan Air