At what minimum speed could dynamic hydroplaning occur on main tires having a pressure of 121 PSI?

Dynamic hydroplaning occurs when an aircraft tire encounters a layer of water on the runway surface, leading to a loss of traction as the tire cannot displace the water quickly enough. The minimum speed at which dynamic hydroplaning can occur is influenced by the tire pressure and the runway surface condition.

In this scenario, the analysis would provide that a tire pressure of 121 PSI is relatively high, which typically raises the speed threshold at which dynamic hydroplaning can occur. Hydroplaning speed can be estimated using the formula:

Hydroplaning Speed (knots) = 9 * (Tire Pressure in PSI)^0.5

Applying this formula with the given tire pressure of 121 PSI:

Hydroplaning Speed = 9 * (121)^0.5

Hydroplaning Speed = 9 * 11 = 99 knots (approximately).

Given the options, the correct minimum speed for dynamic hydroplaning is closest to 95 knots, making it the relevant choice when considering the practical applications around safety and operation limitations within aircraft dispatch scenarios. This calculation aligns with the understanding of hydroplaning speeds and their dependence on tire pressure, emphasizing the importance of evaluating tire specifications during pre-flight preparations.