Flexible interface coupling

A method for reducing vibrational transfer between a heat exchanger and an air cycle machine, the method comprising:

• connecting a fluid inlet of the heat exchanger to a fluid outlet of the air cycle machine using a flexible inlet coupler, the flexible inlet coupler being configured to vibrationally isolate the air cycle machine from the heat exchanger by allowing a diffuser of the air cycle machine to move axially and radially relative to a centerline axis of the flexible inlet coupler,
• wherein the flexible inlet coupler includes a receiving portion having a flared region across which a diameter of the heat exchanger portion increases and a landing portion across which the diameter of the heat exchanger portion is maintained, and an air cycle machine portion received in the receiving portion and including an outlet flange and a diffuser radially inward of the outlet flange, the outlet flange including a radially outward facing surface contacting a radially inward facing surface of the landing portion.