"That's where the profound benefits come in," says Eastlee, who adds that the industry is happy to hear the NTSB guidelines, even if it's a long battle to update an entire fleet of helicopters.
"Regardless of the number, or the trend, any accident is one too many," Eastlee says. "Unfortunately, the technology moves faster than the red tape."
"The only thing that would prevent all accidents, 100 percent, would be if we never took off," said Dawn Mancuso, executive director and CEO of the Association of Air Medical Services. "But that would mean hundreds of thousands of patients would die because they wouldn't be getting the care they need in the time they need it."
ABC News' Lisa Stark and Matt Hosford and The Associated Press contributed to this report.