Which statement best describes a use of the PHEL chart?

• A. Determining stay time and rotating personnel out of heat stress areas according to exposure time
• B. Forecasting ship routes
• C. Planning crew meals
• D. Assessing weapons safety

Answer: (A)

In heat-stress management, a PHEL chart is used to translate the current heat load and level of work into a safe, maximum duration a person can stay in a hot area and when to rotate or remove them for rest and cooling. It ties environmental conditions and exertion to permissible exposure time, helping supervisors schedule breaks and rotations to prevent heat illness. This makes it specifically about managing heat exposure, not forecasting routes, planning meals, or evaluating weapons safety. So, using the chart to determine stay time and when to rotate personnel out of heat-stress areas aligns with its intended purpose.