I would establish a routine maintenance schedule to inspect and clean key components of the propulsion systems, including the engines, fuel lines, and energy management modules. Additionally, I would supervise my engineering team to ensure procedures are consistently followed. In case of a malfunction, I'd first perform diagnostics to identify the issue, then prioritize repairs based on severity and potential risk. If required, I'd coordinate with other departments to reroute power, limit ship's functions or even evacuate the affected areas until the issue is resolved.
Imagine you are the chief engineer aboard an interstellar spaceship. Detail how you'd maintain the ship's propulsion systems and react in case of a malfunction.