▁ 1 1 2 B . ▁This ▁allowed ▁the ▁ 1 1 2 B ' s ▁maximum ▁take off ▁weight ▁to ▁rise ▁to ▁, ▁giving ▁it ▁a ▁respect able ▁useful ▁load ▁of ▁. ▁Production ▁of ▁the ▁ 1 1 2 B ▁ended ▁in ▁ 1 9 7 9 , ▁while ▁the ▁ 1 1 2 TC ▁was ▁further ▁upgrad ed ▁with ▁a ▁ ▁maximum ▁weight ▁increase ▁and ▁minor ▁detail ▁changes . ▁The ▁major ▁change ▁was ▁a ▁complete ▁make over ▁of ▁the ▁av ion ics ▁suite ▁with ▁a ▁three - axis ▁aut op il ot , ▁producing ▁the ▁ 1 1 2 T CA ▁" Al pine ". ▁This ▁offered ▁little ▁more ▁performance ▁than ▁the ▁original ▁ 1 1 2 TC , ▁and ▁was ▁more ▁expensive ▁than ▁similar ▁offer ings ▁from ▁other ▁companies . ▁A ▁smaller ▁set ▁of ▁up gr ades , ▁not ably ▁a ▁three - bl aded ▁prop eller ▁and ▁a ▁slightly ▁raised ▁maximum ▁take off ▁weight ▁of ▁, ▁produced ▁the ▁ 1 1 4 A ▁" G ran ▁Tur ismo ". ▁The ▁ 1 1 2 T CA ▁and ▁ 1 1 4 A ▁remained ▁in ▁production ▁until ▁ 1 9 8 0 , ▁when ▁Rock well ▁shut ▁down ▁the ▁production ▁line ▁with ▁about ▁ 1 , 0 0 0 ▁examples ▁of ▁the ▁different ▁models ▁being ▁delivered . ▁ ▁Commander ▁A ircraft ▁Following ▁the ▁end ▁of ▁production ▁Rock well ▁sold ▁the ▁design ▁rights ▁to ▁the ▁A ero ▁Commander ▁suite ▁to ▁G ulf stream ▁American ▁in ▁ 1 9 8 1 .