ather ed , ▁causing ▁a ▁loss ▁of ▁alt itude . ▁Alt itude ▁was ▁lost ▁until ▁the ▁aircraft ▁struck ▁trees , ▁after ▁which ▁control ▁was ▁lost ▁and ▁the ▁aircraft ▁st alled ▁and ▁crash ed ▁ups ide ▁down ▁on ▁a ▁hill ▁slope . ▁The ▁investigation ▁found ▁that ▁the ▁pilot ▁was ▁dr unk ▁and ▁the ▁co - p il ot ▁was ▁lic ensed ▁to ▁fly ▁the ▁Po - 2 , ▁not ▁the ▁Li - 2 . ▁The ▁sole ▁surv iv or ▁was ▁res cu ed ▁ten ▁days ▁later . ▁March ▁ 2 7 ▁An ▁Air ▁Transport ▁Char ter ▁C - 4 7 A ▁Dak ota ▁III ▁crash ed ▁shortly ▁after ▁take off ▁from ▁Ring way ▁Airport ▁due ▁to ▁engine ▁failure ▁caused ▁by ▁car b ure tor ▁ic ing , ▁killing ▁both ▁pil ots ; ▁a ▁third ▁crew ▁member ▁surv ived . ▁ ▁April ▁April ▁ 6 ▁South west ▁Air ways ▁Fl ight ▁ 7 , ▁a ▁C - 4 7 A ▁( reg istration ▁N 6 3 4 3 9 ) ▁struck ▁a ▁r idge ▁at ▁ 2 7 4 0 ▁feet ▁at ▁Ref ug io ▁Pass , ▁California , ▁in ▁the ▁Santa ▁Y nez ▁Mountains , ▁killing ▁all ▁ 2 2 ▁on ▁board ; ▁the ▁aircraft ▁was ▁flying ▁too ▁low ▁for ▁reasons ▁unknown . ▁April ▁ 8 ▁A ▁US AF ▁C - 4 7 B ▁( serial ▁number ▁ 4 3 - 4 8 2 9 8 ) ▁crash ed ▁into ▁a ▁hill side ▁near ▁Char l eston , ▁West ▁Virginia ▁while ▁on ▁an ▁A