Patent ID: 6877952

Claim:
A passive clearance control for a gas turbine engine that includes a rotor and blades and a shroud surrounding the blades defining a gap between the tips of the blades and shroud, the improvement including a blade segment assembly including a blade outer air seal surrounding the tip of the blades made from a low thermal expansion material, the blade segment assembly includes a generally U-shaped fixed support ring having upstanding arms and an annular bottom portion extending there between, a retainer adjacent to said arms and mounted in sliding relationship thereto, an outer air seal supported to said retainer, a tie member extending between said retainer and said upstanding arms affixing said retainer to said U-shaped support ring, a slot formed in said retainer allowing said retainer and outer air seal to move in a radial direction as a function of the mechanical and thermal expansion and contraction when the gas turbine engine operates over its operating range.