This paper describes the design progress of the X ray Integral Field Unit Focal Plane Assembly (X-IFU FPA) for the Athena X-ray observatory. Test results obtained from the Development Model (DM) program are compared to existing numerical models. From these comparisons input to the next FPA Engineering Model (EM) is derived. Measurements have been done to assess the magnetic shielding performance and key thermal properties are verified. A dedicated configuration is used to verify the changes in mechanical dynamic behavior between ambient temperature and after cool-down to assess micro-vibration susceptibility. We conclude with a summary and outlook for the FPA-EM design.
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