USA. Saunders ST-27: The fuselage was lengthened by , to accommodate up to 23 passengers. It was powered by two Pratt & Whitney Canada PT6A-34 turboprop engines. Twelve Herons were modified by the Saunders Aircraft Corporation of Gimli, Manitoba, Canada. Saunders ST-27A and Saunders ST-27B: The original designations of the ST-28. Saunders ST-28: Improved version of the ST-27. One prototype built. Shin Meiwa Tawron: Conversion by Shin Meiwa of Japan for Toa AirWays (TAW) with 260 hp (194 kW) Continental IO-470 engines replacing the originals. Its name means "TAW"+He"ron". Operators Military operators Ceylon Katanga Civil operators Gulf Aviation Accidents and incidents On 18 April 1955, Union Aéromaritime de Transport F-BGOI, crashed into a Kupe Mountain Cameroon. 12 out of 14 passengers and crew died in the crash. On 7 November 1956, Braathens SAFE LN-SUR, crash-landed in heavy snow on the mountain Hummelfjell in Tolga, Norway. The pilot and one passenger were killed, whilst the remaining crew and passengers survived. The Hummelfjell accident was Braathens SAFE's first fatal accident. The probable cause was unusually heavy icing. On 28 September 1957, British European Airways G-AOFY, on an air ambulance flight, crashed on approach to Glenegedale Airport, Islay, in bad weather. The three occupants, two crew and one nurse, were killed. The pilot did not appreciate that the aircraft had rapidly lost height whilst he was making a visual half circuit to land. On 15 November 1957, Aviaco EC-ANZ crashed into a mountain close to the airport at Son Bonet Aerodrome in bad weather after the pilot made a navigation error at the end of a flight from Barcelona Airport. All six people on board were killed. On 19 February 1958, Gulf Aviation G-APJS, on a ferry flight from Bahrain to England via Athens International Airport, crashed into a mountain near Rome after a navigational error, killing all three people on board. On 14 April 1958, Aviaco EC-ANJ, crashed into the sea off the coast of Barcelona Spain after it was forced to make a sudden avoidance manoeuvre to prevent a mid-air collision. All 16 passengers and crew were killed in the crash. On 14 October 1960, Itavia I-AOMU crashed on Mount Capanne, Italy killing all 11 on board. Bad weather may have played a role in the accident. On 17 August 1963, Fujita Airlines JA6159 crashed just after takeoff into Mount Hachijō-Fuji, Hachijōjima, Japan; the accident killed all 19 passengers and crew