What is required to inhibit the Terrain Awareness Display?

The Terrain Awareness Display is designed to provide pilots with crucial information regarding the aircraft's proximity to terrain and obstacles. Option B is the correct choice because it specifies that the TERR INHIBIT switch should be selected when the aircraft is within 15 nautical miles of takeoff, approach, or landing at a non-EGPWS airport. This is important as it prevents false alerts that could occur in areas where terrain may not pose a risk, especially at airports without advanced terrain awareness systems like EGPWS (Enhanced Ground Proximity Warning System).

This procedure helps ensure smoother operations and reduces pilot workload during critical phases of flight while still adhering to necessary safety protocols. Disabling the Terrain Awareness Display under these specific conditions is a standard practice to enhance situational awareness without the distraction of unnecessary alerts. In contrast, the other options do not represent correct operational procedures or requirements associated with the Terrain Awareness Display, as they either involve inappropriate conditions for disabling the system or do not apply operationally to the aircraft's functioning.