augmentor wing research aircraft. XC8A ACLS One C-8A aircraft converted into an air-cushion landing system research aircraft. NASA / Boeing QSRA C-8A One C-8A converted into a quiet short-haul research aircraft. Viking DHC-5NG Buffalo NG Proposed redesigned new production version to be built by Viking Air. NG is the company marketing term indicating Next Generation Canadian military designations Canadian military designation for 15 DHC-5As. United States military designations AC-2 Designation for four DHC-5s for evaluation by the United States Army. CV-7A Redesignation of four United States Army AC-2s. C-8A United States Air Force designation for four CV-7As transferred from the Army in 1967. Operators Civil Summit Air (8199400 Canada Inc.) operated two DHC-5D (ex-Oman Police Air Wing 1979 and 1981/Shuttle Air Cargo (Congo); transferred from Arctic Sunwest Charters in 2013); C-FASV was sold to Nyassa Air Taxi (Malawi) 2015 with lease to UN OFP and C-FASY stored since 2012 (civil registration cancelled in 2015) Ethiopian Airlines 1 DHC-5D (ET-AHI lost in crash 1988) Nyassa Air Taxi 1 ex-Summit Air DHC-5D Military / Abu Dhabi Defence Forces Air Wing – (Retired). United Arab Emirates Air Force (Retired) Brazilian Air Force (Retired) Cameroon Air Force (Retired) Royal Canadian Air Force (Retired) Chilean Air Force (Retired) (previously ) Air Force of the Democratic Republic of the Congo (Retired) Ecuadorian Air Force (Retired) Ecuadorian Army (Retired) Egyptian Air Force (9) Indonesian Army (ex-UAE, Retired) Indonesian Navy (ex-UAE, Retired) Kenya Air Force (Retired) Mauritanian Air Force - bought four DHC-5Ds in 1978 (retired) Mexican Navy (Retired) Royal Oman Police Air Wing (Retired) Peruvian Air Force (Retired) Sudanese Air Force – 1 in service as of December 2015. Tanzania Air Force Command – 4 in service as of December 2015. and since retired Military of Togo (Retired) United States Army (Retired) NASA 2 C-8A at Ames Research Center (Retired) Zambian Air Force (Retired) Accidents and incidents In total, 26 accidents involving hull losses have been recorded. On 9 August 1974, a Canadian Forces CC-115 operating for the United Nations was shot down over Syria with the loss of five crew and four passengers. At the 1984 Farnborough Airshow, a DHC-5D STOL demonstration ended in a very heavy landing which destroyed the aircraft. On 21 June 1989, a Peruvian Air Force de Havilland Canada DHC-5D Buffalo crashed into a mountain near Tarma, killing all six crew and 53 passengers in the deadliest accident involving the DHC-5 Buffalo.