Each wave trap has a lightning arrester to protect it from surge voltages. The DC line has smoothing reactors and surge arrester capacitors at each station. A spark arrester is often installed within the smokebox. The deflagration may continue downstream of the arrester. The aircraft was also fitted with a retractable arrester hook mounted underneath the rear fuselage. The typical lightning arrester has a high-voltage terminal and a ground terminal. Spark arrester inspections are performed by trained agency law enforcement or fire prevention personnel. The adaptations included a strengthened undercarriage and arrester hook. This junction block usually includes a lightning arrester (which requires a wire to ground). The CVT is installed at a point after Lightning Arrester and before Wave trap. Penalties for violating spark arrester laws depend on the issuing agency. Her arrester gear was replaced by a Japanese-designed, hydraulic Type 1 system with 9 wires. To assist with night landings, the arrester wires were to be illuminated with neon lights. This is the simplest and most common type of spark arrester. Laws governing spark arrester use in the United States depend on the jurisdiction.