Method of mounting a heat exchanger in a gas turbine engine assembly

A method comprising:

• providing a structural body for use in a gas turbine engine, wherein the structural body includes a wall having a slot therein with an elongated cross-section, the slot extending through the wall from a first inner surface of the wall to a second outer surface of the wall;
• providing a heat exchanger being operably associated with a bracket;
• providing a slip joint including a standoff and a biasing element, wherein the standoff includes a hollow cylindrical elongated member and a flange extending orthogonally outwardly from an end of the elongated member, the biasing element positioned about the elongated member;
• positioning the heat exchanger proximate the first surface such that the bracket is positioned adjacent the first surface of the wall;
• inserting the standoff through the slot from the second surface of the wall to the first surface of the wall such that the flange remains outside the wall and such that a distal end of the elongated member is adjacent the bracket and such that the biasing element is positioned about the elongated member between the second surface of the wall and the flange;
• and
• coupling the standoff to the bracket using a fastener extending through the elongated member such that the standoff transfers a first predetermined load to the second surface of the wall via the flange and the biasing element and transfers a second predetermined load to the bracket via the elongated member to facilitate enabling the standoff to slide along the elongated cross-section of the slot, a first end of the fastener bearing on the flange, a second opposite end of the fastener captured using the bracket.