At what speed can hydroplaning occur for the nose tire when inflated to nominal pressure?

• A. 75 knots
• B. 80 knots
• C. 85 knots
• D. 90 knots

Answer: (C)

Hydroplaning can occur when tire pressure and speed reach a threshold where the tire cannot displace water effectively on the runway surface. For aircraft, specifically with regards to the nose tire inflated to nominal pressure, this threshold speed is crucial for safe operations during takeoff and landing.

At approximately 85 knots, the tires are at risk of hydroplaning under wet conditions where the water film on the runway prevents adequate contact between the tire and the surface. This speed represents a significant factor that pilots must be aware of to manage their landing and takeoff speeds while considering runway conditions.

The nominal tire pressure ensures that the tire can perform optimally, but once the speed and wet conditions are in play, the risk of hydroplaning increases, necessitating careful attention to airspeed. Understanding this threshold helps pilots make informed decisions to maintain control and ensure safe operations during operations in adverse weather.