What does RCS measure in aircraft maintenance?

The correct response identifies RCS, which stands for Radar Cross Section, as measured in square meters. This measurement is crucial in the context of aircraft maintenance, particularly for stealth and low observable aircraft. RCS quantifies how detectable an object is by radar; a lower RCS indicates a reduced radar signature, making an aircraft less visible to radar systems.

Understanding RCS is essential for evaluating and maintaining the stealth capabilities of an aircraft. It assists maintenance personnel in assessing whether the aircraft's surface treatments and structures meet design specifications for minimizing radar reflection.

The other choices, such as kilograms, sculptural form, and decibels, do not pertain to the context of measuring radar visibility and performance within aircraft systems, which reinforces why square meters is the appropriate unit for this measure.