Aviation warning lights on water storage tanks must be replaced before reaching what percentage of their normal life expectancy according to FAA regulation?

According to FAA regulations, aviation warning lights on water storage tanks are required to be replaced before they reach 75% of their normal life expectancy. This is to ensure that the lights remain operational and continue to provide adequate visibility for aircraft in the area, preventing potential accidents by maintaining consistent safety signals. By adhering to this guideline, water storage facilities can effectively manage maintenance schedules and ensure compliance with regulations, significantly reducing the risk of safety hazards associated with malfunctioning or burnt-out warning lights.