According to Tradewind regulations, what is prohibited for descending below minimums?

Descending below minimums during an approach is a critical phase of flight governed by specific regulations to ensure safety and operational integrity. In this context, VGSI systems such as Precision Approach Path Indicator (PAPI) and Visual Approach Slope Indicator (VASI) provide pilots with visual references to maintain the correct glide slope during the approach. These systems are designed to assist pilots in visually determining the correct altitude relative to the runway and ensuring a safe descent path.

However, descending below minimums when relying solely on VGSI indicators is prohibited because these visual aids do not guarantee the necessary visual references or operational criteria required for safe landing. Without adequate visual cues to support the descent and landing, pilots may place the aircraft at risk of controlled flight into terrain or other unsafe situations.

In contrast, GPWS warnings, ILS systems, and visual approaches, when properly utilized and within the operational parameters set by relevant regulations, have established guidelines and safety protocols that govern their use even when approaching minimums. Consequently, reliance on VGSI systems without additional verified references is what makes this option prohibited according to Tradewind regulations.