What is the LO verification tier that consists of a whole body near-field measurement?

The correct answer is identified as tier III, which specifically pertains to low observable (LO) verification through a whole body near-field measurement. This tier involves detailed assessments where measurements are taken from a close range to evaluate the scattering characteristics of the entire aircraft surface. This kind of measurement is essential for ensuring that the aircraft maintains its low observable properties under operational conditions.

Tier III measurements are crucial for identifying and quantifying the radar cross-section (RCS) of an aircraft in configurations that closely mimic real-world scenarios. This allows maintenance personnel to accurately assess the effectiveness of LO features, such as coatings and structural designs, at a more comprehensive level compared to other tiers, which may focus on specific areas or configurations. By using near-field measurements, technicians can gather precise data that inform maintenance decisions aimed at maintaining or enhancing the aircraft's stealth capabilities.

Other tiers, such as I and II, may provide different levels of assessment but do not focus on the whole body near-field measurements providing a complete picture of the aircraft’s signature characteristics.