EN3745-411 specifies two test methods for determining the resistance of aerospace fiber optic cables to fluid exposure. Method 1 (occasional contamination) tests cables against accidental fluid contact, while Method 2 (extended contamination) tests cables intended for areas with prolonged fluid exposure.
Specimens are immersed in test fluids specified in EN 3909 at controlled temperatures for defined periods. After exposure, cables are evaluated for changes in optical transmission properties (attenuation), physical integrity, and visual appearance.
This standard ensures that fiber optic cables used in aircraft applications can withstand exposure to fuels, hydraulic fluids, lubricants, cleaning agents, and de-icing fluids without degradation of optical performance or physical integrity.