▁The ▁N T SB ▁concluded ▁that ▁the ▁wing ▁surface ▁became ▁cont amin ated ▁by ▁a ▁build - up ▁of ▁ice ▁on ▁the ▁wings ▁of ▁Fl ight ▁ 1 7 1 3 ▁prior ▁to ▁departure , ▁based ▁on ▁reports ▁from ▁surv iving ▁passengers ▁that ▁they ▁had ▁seen ▁" patch es " ▁of ▁ice ▁on ▁the ▁wing ▁after ▁de icing ▁was ▁complete . ▁Investig ators ▁also ▁concluded ▁that ▁enough ▁wet ▁snow ▁land ed ▁on ▁Fl ight ▁ 1 7 1 3 ▁after ▁de icing ▁was ▁complete ▁to ▁m elt ▁and ▁dil ute ▁the ▁de icing ▁fluid , ▁which ▁allowed ▁ice ▁to ▁reform ▁on ▁the ▁wings . ▁According ▁to ▁the ▁aircraft ' s ▁manufact urer , ▁even ▁a ▁mod est ▁amount ▁of ▁ice ▁cont am ination ▁on ▁the ▁upper ▁wing ▁could ▁imp air ▁the ▁lif ting ▁performance ▁of ▁the ▁wings ▁and ▁lead ▁to ▁loss ▁of ▁roll ▁and ▁pitch ▁control . ▁Based ▁on ▁this , ▁the ▁N T SB ▁concluded ▁that ▁a ▁small ▁amount ▁of ▁ice ▁on ▁the ▁wings ▁had ▁caused ▁Fl ight ▁ 1 7 1 3 ▁to ▁have ▁significant ▁cont roll ability ▁problems . ▁ ▁The ▁N T SB ▁also ▁determined ▁that ▁the ▁first ▁officer ' s ▁poor ▁performance ▁during ▁take off ▁had ▁likely ▁contributed ▁to ▁his ▁loss ▁of ▁control ▁of ▁the ▁air plane . ▁The ▁first ▁officer ▁rot ated ▁the ▁air plane ▁at ▁more ▁than ▁ 6 ▁degrees ▁per ▁second , ▁or ▁twice ▁the ▁recommended ▁rate . ▁Com b ined ▁with ▁the ▁effects ▁of ▁ice ▁on ▁the ▁wing , ▁the ▁high ▁clim b ▁rate