Which navigational aid is NOT commonly used during Terrain Flight Operations?

In Terrain Flight Operations, the primary focus is on maneuvering the aircraft safely and effectively in response to the terrain, which demands precise situational awareness. While GPS, NDB, and VOR all play significant roles in navigation, radar is not typically utilized in these operations for several reasons.

GPS provides accurate positioning and navigation information, allowing pilots to track their route relative to the terrain. NDB (Non-Directional Beacons) facilitates navigation by providing bearing information that pilots can follow. VOR (VHF Omnidirectional Range) offers directional guidance to maintain course alignment, which is vital when flying around varying terrain.

Radar, while it is an effective navigational aid in many flight scenarios, including air traffic control and weather monitoring, is not commonly employed during Terrain Flight Operations. This is mainly due to its limitations in providing precise elevation data concerning the terrain. Terrain avoidance is often managed through pilotage, use of charts, and other navigational aids that directly support low-level flight, making radar less relevant for these specific operations.