The problem involves use of deflection data in estimation of surface pressure forces in DLOAD and carry out time domain aeroelastic analysis. I was able to use DLOAD to apply pressure as a function of COORDS . I am facing difficulty in writing the deflection data using URDFIL to a file (.fil) and then reading that file while applying it in DLOAD subroutine. I have gone through the example problem which is shared in https://imechanica.org/files/Writing%20User%20Subroutines%20with%20ABAQUS_0.pdf in sec L5, but I am not able to write the deflection data.