Why does the safety accident rate for CAST differ from the FAA safety accident rate?
CAST only addressed Part 121 (commercial aviation operations), did not include ramp accident fatalities and was based on a five-year-moving average. CAST defined a fatal accident as those where a fatality to passengers or crew occurred. The 65 percent accident reduction rate used by the FAA is based on calculations of commercial data accident rate over the past 10 years and covers Party 121 and Part 135 (general aviation operations). The calculations include ramp accidents and accidents where the only fatalities were not on the airplane.
