What does a dry Transport Canada standard wind direction indicator indicate when horizontal?

A dry Transport Canada standard wind direction indicator, when horizontal, indicates a wind speed of at least 15 knots. This is based on the operational design of the indicator, which is calibrated to show specific wind conditions. When the indicator is horizontal, it suggests that the wind flow has sufficient force to cause the indicator to extend fully in the direction of the wind.

In meteorological terms, a wind speed of 15 knots is generally regarded as a significant enough breeze that would enable the indicator to respond in this manner. This allows pilots and observers to assess the wind condition effectively, as it provides clear information on wind strength.

A horizontal position does not indicate lighter winds or calm conditions, as that would typically result in the indicator being in a drooped or non-horizontal position. Thus, understanding this mechanism helps pilots operate safely and effectively in changing wind conditions.