[en] The heavy-fermion compound CePdAl exhibits an antiferromagnetic phase transition at 2.7 K (T_N). Ce atoms in CePdAl form a distorted Kagome lattice in the c-planes. The ordered spin structure in the Kagome plane is of a partially disordered type, which has a third paramagnetic spins. The k-vector is (1/2, 0,τ ∼ 0.35), which is incommensurate along the c-axis. Frustration effects in the Kagome plane are responsible for this partially disordered structure, although the origin of the incommensurability is not clear at present. Whether or not a magnetic phase transition occurs at lower temperatures is a question of considerable interest. ²⁷Al nuclear magnetic resonance measurements have been performed at low temperatures to investigate the transition below T_N. There is no remarkable change in the spin-echo spectra below T_N down to 0.5 K. On the other hand, the spin-lattice relaxation rate shows a small anomaly around 1 K. This strongly suggests that there is another phase transition below T_N. Some possible origins of successive transitions are discussed