During an approach, what is the most important indicator of possible wind shear?

The most important indicator of possible wind shear during an approach is the power and vertical velocity needed to remain on the proper glide path. Wind shear refers to the rapid change in wind speed and direction over a short distance, which can have significant impacts on an aircraft's performance during critical phases of flight, particularly during takeoff and landing.

When an aircraft encounters wind shear, there can be unexpected changes in lift and drag, which will affect the aircraft's ability to maintain its intended flight path. This may require the pilot to increase power significantly to counteract the loss of lift or a change in the rate of descent. Monitoring the power settings and vertical speed indicators provides real-time feedback on the aircraft's performance and highlights any anomalies compared to expected flight parameters.

While trim adjustments, heading changes, and altimeter readings can also provide valuable information during an approach, they are not as immediate or direct indicators of wind shear effects on climb rate or descent trajectory. Trim adjustments might be made for various reasons that are not related to wind shear, and heading changes are typically corrective actions that can be based on various other factors, not just wind. Altimeter readings provide altitude information but do not directly reflect changes in wind speed or direction that would indicate wind shear.

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