BBC source : http://www.bbc.com/news/world-europe-38449058?utm_campaign=AvGeek%2BWeekly&utm_medium=email&utm_source=AvGeek_Weekly_117   extrait Tupolev-154: Russian workhorse The backbone of Soviet and Russian airlines for decades Three engines, narrow-bodied and medium range Designed in the mid-1960s, came into service in 1972 and was modernised in 1986 with new engines and equipment Has seen 39 fatal accidents, although…