off ▁weight ▁variant ▁of ▁the ▁− 1 0 2 , ▁a ▁P W 1 2 4 B - power ed ▁variant ▁cert ified ▁in ▁December ▁ 1 9 8 9 . ▁ ▁A TR ▁ 7 2 – 2 1 0 ▁Two ▁sub - types ▁were ▁market ed ▁as ▁the ▁ 2 1 0 ▁series ▁( − 2 1 0 ): ▁ ▁the ▁− 2 1 1 ▁( and ▁with ▁an ▁en larg ed ▁cargo ▁door , ▁called ▁the ▁− 2 1 2 ) ▁is ▁a ▁− 2 0 0 ▁with ▁P W 1 2 7 ▁engines ▁producing ▁ ▁each ▁for ▁improved ▁performance ▁in ▁hot ▁and ▁high - alt itude ▁conditions . ▁The ▁sub - types ▁differ ▁in ▁the ▁type ▁of ▁doors ▁and ▁emer gency ▁ex its ▁A TR ▁ 7 2 – 2 1 1 ▁P W 1 2 7 - power ed ▁variant ▁cert ified ▁in ▁December ▁ 1 9 9 2 . ▁A TR ▁ 7 2 – 2 1 2 ▁P W 1 2 7 - power ed ▁variant ▁cert ified ▁in ▁December ▁ 1 9 9 2 . ▁ ▁A TR ▁ 7 2 - 2 1 2 A ▁Cert ified ▁in ▁January ▁ 1 9 9 7 ▁and ▁fitted ▁with ▁either ▁P W 1 2 7 F ▁or ▁P W 1 2 7 M ▁engines , ▁the ▁− 2 1 2 A ▁is ▁an ▁upgrad ed ▁version ▁of ▁the ▁− 2 1 0 ▁using ▁six - bl aded ▁prop ellers ▁on ▁otherwise ▁identical ▁P W 1 2