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This ongoing series reveals how continuing mechanical problems with both the Army's and Coast Guard's workhorse helicopters are putting pilots, crews and the public at risk. A newspaper data analysis showed that more than half of all Coast Guard aircraft accidents concerned one particular type of helicopter, which also had the most deadly and expensive accidents. In the Army, accidents involving its Apache helicopters have been more costly than any other aircraft over the past two years, with a third of the fleet grounded for maintenance at any given time.