What makes reflective surfaces a concern for Low Observable aircraft?

Reflective surfaces are a significant concern for Low Observable (LO) aircraft because they increase radar detection. Low Observable technology aims to minimize the radar cross-section (RCS) of an aircraft, allowing it to evade or reduce detection by enemy radar systems. When surfaces of an aircraft are reflective, they can scatter radar waves, making the aircraft more visible to radar detectors. This defeats the purpose of stealth technology, which is designed to minimize the aircraft's signature on radar systems.

In contrast, other options do not align with the characteristics and goals of Low Observable aircraft. For example, improving stealth performance or reducing maintenance requirements are not effects associated with reflective surfaces. Similarly, while enhancing visibility could be true in terms of visual sighting, it does not connect with the intent behind the design of LO aircraft, which focuses on avoiding detection. Thus, the connection of reflective surfaces to increased radar detection underscores the importance of maintaining Low Observable techniques in aircraft design and maintenance.