0 . 5 M ▁and ▁the ▁engine ▁over ha ul ▁costs ▁$ 0 . 3 - 1 . 0 M . ▁ ▁Vari ants ▁ ▁A TR ▁ 7 2 – 1 0 0 ▁Two ▁sub - types ▁were ▁market ed ▁as ▁the ▁ 1 0 0 ▁series ▁( − 1 0 0 ). ▁A TR ▁ 7 2 – 1 0 1 ▁Initial ▁production ▁variant ▁with ▁front ▁and ▁rear ▁passenger ▁doors , ▁power ed ▁by ▁two ▁P W 1 2 4 B ▁engines ▁and ▁cert ified ▁in ▁September ▁ 1 9 8 9 . ▁A TR ▁ 7 2 – 1 0 2 ▁Initial ▁production ▁variant ▁with ▁a ▁front ▁cargo ▁door ▁and ▁a ▁rear ▁passenger ▁door , ▁power ed ▁by ▁two ▁P W 1 2 4 B ▁engines ▁and ▁cert ified ▁in ▁December ▁ 1 9 8 9 . ▁ ▁A TR ▁ 7 2 – 2 0 0 ▁ ▁Two ▁sub - types ▁were ▁market ed ▁as ▁the ▁ 2 0 0 ▁series ▁( − 2 0 0 ). ▁The ▁− 2 0 0 ▁was ▁the ▁original ▁production ▁version , ▁power ed ▁by ▁Pr att ▁& ▁Whit ney ▁Canada ▁P W 1 2 4 B ▁engines ▁r ated ▁at ▁. ▁A TR ▁ 7 2 – 2 0 1 ▁High er ▁maximum ▁take - off ▁weight ▁variant ▁of ▁the ▁− 1 0 1 , ▁a ▁P W 1 2 4 B - power ed ▁variant ▁cert ified ▁in ▁September ▁ 1 9 8 9 . ▁ ▁High er ▁maximum ▁take -