Story ID: 
Aviation Safety Question of the Week
By: Chad Trautvetter
Caption: Sponsored by FlightSafety International
Word Count: 113
Provided by FlightSafety International

What is the main element that determines at what speed hydroplaning will begin?

A. Thickness of water film on runway	B. Wear state of tires	C. Number of tires per axle	D. Tire pressure

Correct Answer: D	Hydroplaning speed is calculated by multiplying the square root of the tire pressure by a constant. The lower your tire pressure, the lower your hydroplaning speed. The higher your tire pressure, the higher your hydroplaning speed. Maintaining the highest tire pressure recommended by the manufacturer will allow the fastest speed before hydroplaning occurs. Yet another reason why your tire pressure should be checked routinely.