A new inspection by the US Department of Labor's Occupational Safety and Health Administration will focus on the safety of airport traffic control tower workers.
The inspection, known as the Federal Aviation Administration's (FAA) Airport Traffic Control Tower Monitoring Programme, will scrutinise control tower personnel in the event of emergencies such as fire.
The programme will pay particular attention to the exit provisions at the FAA's air traffic control towers.
As part of the programme, the FAA is required to bring towers into compliance with the alternate standard for egress and fire safety.
OSHA inspectors will check whether FAA is following this prerequisite by randomly inspecting selected towers.
Out of 386 towers presently covered under the standard, the FAA has validated 190 as being compliant.