A few points on nomenclature. Cardinal is indeed correct in his description of a electro/hydraulic powerpack, however not all King Airs use this set up as mentioned previously. "Powerpack" can mean many things and in fact you will find that Piper uses this term for the hydraulic control systems in many of their aircraft that use an engine driven hydraulic pump such as the Aztec, Navajo, Chieftain, etc.