EN3745-512 specifies the method for testing the crush resistance of aerospace fiber optic cables. A cable specimen is placed between flat plates or rollers and subjected to controlled compressive loads while monitoring optical performance.
The test measures the change in optical attenuation as increasing lateral force is applied to the cable. Both transient effects during loading and permanent degradation after load removal are evaluated.
Crush resistance testing is critical for fiber optic cables in aircraft installations where cables may be subject to compressive forces from clamps, tie-wraps, structural elements, or maintenance activities.