A Bell 222 helicopter, similar to the one show in the computer-generated image, crashed Wednesday evening, killing three crew members and a 14-month-old patient.
Bell says members of the Security, Police and Fire Professionals of America Local 256 ratified the three-year contract Sunday. The union represents about 60 workers at Bell's DFW plants.
The deal was the fourth and last labor contract Bell negotiated this year. The others that went smoothly were with unions representing office workers and engineering workers.
That wasn't the case for a union representing 2,500 manufacturing workers, which went on strike for nearly six weeks. United Auto Workers Local 218 members finally ratified a four-year contract in July after several failed talks with Bell.
Fort Worth-based Bell Helicopter is a wholly owned subsidiary of Textron Inc.