The recent observation of multiferroic behaviour in the compound (NH4)2[FeCl5(H2O)] has stimulated the interest in the study of themechanisms governing the magnetic interactions in this system. The purpose of this continuation proposal is to investigate by inelastic neutron scattering the magnon spectrum of the deuterated form, (ND4)2[FeCl5·(D2O)]. In a previous proposal (4-01-1504), 7 days were requested to obtain full maps of the ground state in two orientations plus an exploration of the temperature evolution, but the subcommittee allocated only 3 days in order to demonstrate the feasibility of the experiment. Our recent experiment at IN5 proves this point. A full map (in a single orientation, with a-axis vertical) was recorded at 1.6 K in ~48 h The data are of good quality and three branches are clearly observable. However, in order to have a full picture, a second orientation will be necessary, together with a full data collection at 7K in order to compare the cycloidal (ferroelectric) and the sinusoidal (paraelectric) phases.