What is the strength rating of the runway surface at EFTA?

The strength rating of the runway surface is essential for determining the type and weight of aircraft that can safely operate at a given airport. The specific strength rating system used provides various codes that indicate the load-bearing capacity of the runway.

In this case, the strength rating of 6/F/B/Y/T indicates a strength rating of 6, which corresponds to a certain level of load-bearing capabilities suitable for specific categories of aircraft. The subsequent letters and characters provide additional information about the runway material, its friction characteristics, and its surface type.

The combination used in the correct answer represents a recognized standard in aviation that reflects the engineering specifications of the runway surface at EFTA, suggesting that it is equipped to handle a range of aircraft with a defined limit on maximum allowable weight.

Other options present different ratings; however, they do not match the designated strength of the runway at EFTA as per its specific categorization. Each unique combination is tailored to particular airports based on structural assessments and regulatory guidelines, maintaining safety and performance standards for aircraft operations in the area.