How many recalls does it take before the NHTSA tells you to get out of the motorcycle helmet business? Well if you’re Advanced Carbon Composites, the answer is five – five motorcycle helmet recalls in a row. For a company that warns buyers away from buying inferior products from China and India, Advanced Carbon Composites (ACC) has had a number of problems with its EXT series (all four of them) of motorcycle helmets, including the helmets failing to meet the basic DOT safety guidelines, which finally lead to the ACC ceasing to produce motorcycle helmets at the behest of the NHTSA.