It is common to find DC power as the main source of electricity in smaller aircraft. For example, in most turboprop aircraft such as the ATR and the Dash 8s, the DC motors act as starter. There are two main types of electrical systems. One is called the split bus system and the other is called the parallel bus bar system. A. Most modern aircraft use this type of system. In a split bus bar system, each generator has its bus bar and there is no paralleling. Each. Parallel bus bar systems are rarely used in aircraft these days due to their complexity. It is mainly found in three or four-engine aircraft. As the name. All transport aircraft have backups for electrical systems. The generators, which are the primary source of electricity, are run by engines and a.