1 9 7 2 . ▁It ▁also ▁led ▁to ▁changes ▁that ▁further ▁increased ▁the ▁weight ▁of ▁the ▁aircraft . ▁This ▁resulted ▁in ▁its ▁being ▁seriously ▁under power ed ; ▁the ▁ 1 1 2 ▁prototype ▁was ▁power ed ▁by ▁a ▁ 1 8 0   hp ▁( 1 3 4   k W ) ▁Ly coming ▁O - 3 6 0 ▁engine , ▁this ▁was ▁replaced ▁by ▁a ▁ 2 0 0   hp ▁( 1 4 9   k W ) ▁IO - 3 6 0 ▁engine ▁in ▁production ▁aircraft . ▁Even ▁with ▁this ▁engine ▁there ▁is ▁w ides p read ▁agreement ▁that ▁the ▁aircraft ▁was ▁under power ed . ▁Another ▁anno y ance ▁was ▁that ▁the ▁fib reg lass ▁composite ▁doors ▁did ▁not ▁fit ▁well ▁and ▁t ended ▁to ▁leak . ▁ ▁New ▁versions ▁After ▁ 1 2 3 ▁production ▁aircraft ▁had ▁been ▁built ▁a ▁number ▁of ▁improvements ▁were ▁made ▁to ▁the ▁ 1 1 2 ▁in ▁ 1 9 7 4 , ▁producing ▁the ▁ 1 1 2 A . ▁The ▁doors ▁were ▁fixed ▁by ▁replacing ▁them ▁with ▁new ▁al umin um ▁units , ▁which ▁added ▁still ▁more ▁weight , ▁but ▁had ▁the ▁added ▁benefit ▁of ▁making ▁the ▁cabin ▁qui eter . ▁The ▁wing ▁was ▁red es igned ▁internally ▁with ▁increased ▁fuel ▁capacity ▁and ▁a ▁ 1 0 0   lb ▁increase ▁in ▁maximum ▁take off ▁weight ▁( M TO W ) ▁to ▁ 2 , 6 5 0   lb ; ▁After ▁another ▁ 3 0 ▁ 1 1