Prediction of the LISA-Pathfinder release mechanism in-flight performance

► The injection into geodesic orbit of the test masses of the LISA-Pathfinder mission is recognized as a critical phase. ► A criticality consists in adhesion between the test masses and the release mechanisms. ► Residual load and non-synchronous action of the two symmetrical mechanisms is another criticality. ► Prediction of the test mass residual velocity based on tests and simulations shows low margins. ► Both critical effects are investigated and relevant requirements highlighted.