What could increase the risks in Terrain Flight Operations?

Operating without proper navigation aids significantly increases the risks in Terrain Flight Operations because navigation aids are essential for ensuring safe and precise flight paths, especially in challenging terrains or conditions. When pilots cannot rely on these aids, they may struggle with situational awareness and decision-making, potentially leading to hazardous situations like spatial disorientation or collisions with terrain or obstacles.

The other choices highlighted, such as conducting routine weather checks, flying in optimal visibility conditions, and utilizing experienced crew members, actually contribute to reducing risks rather than increasing them. Regular weather checks help pilots anticipate and react to changing conditions, optimal visibility enhances a pilot's ability to see and avoid obstacles, and experienced crew members bring valuable skills that enhance safety and operational effectiveness.