What is a helipad used for?

A helipad is specifically designed to accommodate helicopter operations. It serves as a designated area for helicopters to take off and land safely. The distinguishing feature of a helipad is its structure and specification, which are tailored to the unique requirements of helicopters, such as their size, weight, and operational dynamics.

In contrast, other options describe functions that do not align with the primary purpose of a helipad. For example, the indication of fuel stations relates more to support facilities at an airport rather than a dedicated area for helicopter operations. The option regarding airplane takeoffs refers to runways or taxiways designed for fixed-wing aircraft, not helipads. Lastly, the parking of airplanes before servicing generally occurs on ramps or in hangars designed for that purpose, not on helipads. Thus, the correct answer emphasizes the specialized role of helipads in aviation infrastructure.