Officers Gayle W. Wood and James E. McCabe were on air-traffic patrol, making their last run before quitting at dusk when their CHP helicopter crashed and burned near Castaic Lake on Interstate 5. The helicopter struck a power line support that apparently was not visible in the approaching darkness. Officer Wood, the 41-year-old pilot, was a 10-year veteran of the Patrol and had been a CHP pilot for five years.