The transition to electrified propulsion systems (EPS) within the automotive sector is maturing, many manufacturers have Battery Electric Vehicles (BEV) within their product offering. The hazards associated with EPS technology, which comprises of a Rechargeable Electrical Energy Storage System (REESS), charging systems, electric drive systems, thermal management systems, DC/DC converter, and supervisory control systems, are well understood and technical safety concepts are in series production. The aviation industry is now in an intense research and development phase for new energy propulsion systems, including electrification. This paper explores the potential to safely expedite the transition to ‘electrified’ aviation through reapplication of automotive EPS technology, or whether EPS technology may be viably developed for use in both automotive and aviation domains. A REESS case study is utilised, comparisons between technical and process orientated safety regulations and standards are made, and technical solutions are developed utilising an exemplar ‘automotive-aviation’ process model. The study shows that, while some unique new work products will be required, automotive technology may be utilised within aviation, subject to review and revision to ensure compliance with aviation regulations. The study also identifies opportunities to enhance the development process through sharing of best practice between the automotive and aviation domains.