Which tool is commonly utilized for removing filler material from gaps and seams on LO aircraft?

The nonmetallic pick is the appropriate tool for removing filler material from gaps and seams on low observable (LO) aircraft. This tool is designed to be non-damaging to the sensitive surfaces of LO aircraft, which often require careful handling to maintain their stealth characteristics and protect against damage. Nonmetallic picks can effectively scrape out filler materials without risking scratches or marred surfaces, making them ideal for precision work in tight spaces.

In contrast, a metallic scraper may not be suitable due to its potential to scratch or otherwise damage the aircraft's sensitive coatings. A power drill is typically used for drilling or fastening tasks rather than for delicate removal of materials, and a sanding tool, while useful for smoothing surfaces, does not provide the precise control needed to clean gaps and seams without risk to adjacent materials. Thus, using a nonmetallic pick ensures the integrity and performance of the aircraft's low observable features.