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The ever increasing complexity and integration of systems together with the explosive growth of electronics and computational communications have led to higher demands for energy, as recognized by the SAE ARP 4754 on complex or highly integrated systems. Electrical power conditioning and distribution is one of the vital functions in many types of systems, among which stands out the charging and discharging of batteries. In such systems, it's been known that incorrect handling can lead to thermal runway as already experienced in aerospace, aviation, automotive and portable consumer devices industries.

Avionics Systems are increasingly used to perform safety-critical functions at high altitudes. But their increasing capacity and concentration of memory and logics leads to more frequent occurrences of single event upsets, especially in high altitudes. In this work we discuss the effects and mitigation of single event upsets on avionics systems to help in developing future requirements. To do that we initially present the concepts of radiation environment of the atmosphere, radiation induced errors, single event upsets, etc. Then, we discuss some of their effects on avionic systems and ways of mitigation. Finally, we discuss provisions to demand the adoption of such mitigation measures, and their sufficiency. This will help in developing future requirements to accomplish the objectives of a safe operation of civil transportation aircraft.