3 October 1978
Finnish Air Force
| Engine failure, pilot error, stall|
Rissala, Siilinjärvi, Finland
1978 LAV HS 748 accident, 1978 Iranian Chinook, Aero Flight 217, 1978 Balkan Bulgarian, Continental Airlines Flight 603
The Finnish Air Force DC-3 disaster occurred when a plane of this class crashed into Lake Juurusvesi in Rissala on 3 October 1978, killing all fifteen people on board. It was caused by a cracked exhaust valve, resulting from metal fatigue in an engine cylinder.
1978 Finnish Air Force DC-3 crash Wikipedia
The crash, also known as the Rissala air disaster, killed all fifteen people on board, including politicians and prominent businessmen attending a national defence course organized by the Finnish Defence Forces.
After the airplane departed Kuopio Airport at 21:31 local time, one of its engines lost power. The pilot attempted to return to the airport, but during the turn the aircraft lost altitude and impacted Lake Juurusvesi.
The primary cause of the accident was found to be mechanical failure resulting from a fatigue breakdown in one of the cylinders of the No.2 engine, which resulted in cracking of an exhaust valve. The airplane had been maintained and was checked the previous day, but the crack would only have been visible by partially disassembling the engine.
The investigation board determined that the attention of the crew was concentrated on the engine failure instead of flying with one engine, possibly due to carrying out engine fire drills.
The accident hastened replacing the aging DC-3 fleet of the Finnish Air Force with Fokker F.27s. Air force and Finnair pilots were given more training for emergency situations.Risto K. Alanko, Chief Executive Officer (CEO) of Oy Lohja Ab
Kirsti Hollming Member of parliament (MP), National Coalition Party (NCP)
Colonel Aarno Hukari, Commander of the Suomenlinna coastal artillery regiment
Aaro Kenttä, Chief director of Statistics Finland
Lieutenant colonel Tapio Kokkonen, Commander of the Coastal Jaeger Battalion (Upinniemi)
Pekka Lahdensuu, Director of the national export credit agency (today Finnvera)
Olavi Majlander MP, Christian Democrats (SKL)
Arto Merisaari MP, Finnish People's Democratic League (SKDL)
Antti Pohjonen, Governor of Vaasa Province, Social Democratic Party of Finland (SDP)
Kari Sinisalo, Legislative director of the Ministry of Justice
Viljo Särkkä, CEO of Kemira Oy
Olli Varho, CEO of Oy International Business Machines Ab (IBM in Finland)
First Lieutenant Kari Halmetoja, pilot
Master Sergeant Seppo Raninen, co-pilot
Sergeant-Major Heikki Mannila, flight engineer
Tarja Halonen, the future President of Finland, then MP (SDP) would have been a passenger on the flight had her doctor not advised her not to fly, due to her late-stage pregnancy.