Index D is assigned to aircraft in which length range?

Index D is assigned to aircraft in which length range?

• A. Less than 90 feet
• B. 90 to less than 126 feet
• C. 126 to less than 159 feet
• D. 159 to less than 200 feet

Answer: (D)

Aircraft length is grouped into four ARFF indexes to tailor response resources. The largest index covers aircraft that are 159 feet to under 200 feet long. This is why the correct range is 159 to less than 200 feet. Shorter aircraft fall into the earlier indexes, which represent smaller-length brackets and require different resource allocations. Recognizing this helps responders size equipment, nozzle selection, and staffing appropriately for the airframe’s fire behavior and rescue needs.

Aircraft length is grouped into four ARFF indexes to tailor response resources. The largest index covers aircraft that are 159 feet to under 200 feet long. This is why the correct range is 159 to less than 200 feet. Shorter aircraft fall into the earlier indexes, which represent smaller-length brackets and require different resource allocations. Recognizing this helps responders size equipment, nozzle selection, and staffing appropriately for the airframe’s fire behavior and rescue needs.