A turbine shroud assembly for a gas turbine engine, said turbine shroud assembly comprising: a ring segment including a ring segment panel comprising a leading edge, a trailing edge and a midsection defined therebetween, said ring segment comprising a forward mounting hook at said leading edge, a midsection mounting hook at said midsection and an aft mounting hook at said trailing edge; a ring segment carrier circumferentially spanning and supporting said ring segment, said ring segment carrier comprising a forward section, a midsection and an aft section, said forward section forming a forward hanger coupled to said forward mounting hook, said midsection forming a midsection hanger coupled to said midsection mounting hook defining a first leakage path, said aft section forming an aft hanger coupled to said aft mounting hook defining a second leakage path; a forward impingement cooling chamber defined between said ring segment panel and said ring segment carrier and between said forward mounting hook and said midsection mounting hook; at least one feed hole extending through said ring segment carrier and configured to meter high pressure cooling air into said forward impingement cooling chamber; an aft low pressure chamber defined between said ring segment panel and said ring segment carrier and between said midsection hanger and said aft mounting hook, said ring segment carrier substantially preventing cooling air from entering said aft low pressure chamber; an isolation plate extending between said midsection mounting hook and an aft location adjacent to said ring segment panel defining an isolation chamber radially inward from said aft low pressure chamber between said isolation plate and said ring segment panel; and a transverse crossover passage formed through said midsection mounting hook providing cooling air from said forward impingement cooling chamber to said isolation chamber, said isolation plate substantially preventing cooling air provided to said isolation chamber from entering said aft low pressure chamber. a ring segment including a ring segment panel comprising a leading edge, a trailing edge and a midsection defined therebetween, said ring segment comprising a forward mounting hook at said leading edge, a midsection mounting hook at said midsection and an aft mounting hook at said trailing edge; a ring segment carrier circumferentially spanning and supporting said ring segment, said ring segment carrier comprising a forward section, a midsection and an aft section, said forward section forming a forward hanger coupled to said forward mounting hook, said midsection forming a midsection hanger coupled to said midsection mounting hook defining a first leakage path, said aft section forming an aft hanger coupled to said aft mounting hook defining a second leakage path; a forward impingement cooling chamber defined between said ring segment panel and said ring segment carrier and between said forward mounting hook and said midsection mounting hook; at least one feed hole extending through said ring segment carrier and configured to meter high pressure cooling air into said forward impingement cooling chamber; an aft low pressure chamber defined between said ring segment panel and said ring segment carrier and between said midsection hanger and said aft mounting hook, said ring segment carrier substantially preventing cooling air from entering said aft low pressure chamber; an isolation plate extending between said midsection mounting hook and an aft location adjacent to said ring segment panel defining an isolation chamber radially inward from said aft low pressure chamber between said isolation plate and said ring segment panel; and a transverse crossover passage formed through said midsection mounting hook providing cooling air from said forward impingement cooling chamber to said isolation chamber, said isolation plate substantially preventing cooling air provided to said isolation chamber from entering said aft low pressure chamber.