The paper investigates structural deflection of flexible satellite during attitude maneuvers. The satellite is consisted of a rigid main body and two flexible solar panels. Elastic motions of the flexible panels are discretized adhering the finite element method. The attitude maneuvers are equipped with feed-forward inputs in constant amplitude. The inputs are utilized to the satellite complying the fuel-efficient input shaper method. Several cases are investigated in the simulation in order to conclude the influence of fuelling duration with respect to the solar panel deflection, especially in the transient response. © 2016 The Society of Instrument and Control Engineers-SICE.