The windshield protects the inside of an airplane from temperature changes, precipitation and high speeds. Ideally, this seamless piece of glass would disappear from your mind and go unnoticed most of the time. But nothing makes you pay attention to a windshield like cracks, chips and other defects.
In extreme temperatures, glass expands when it's warm and contracts when it's cold. While automotive glass is designed to minimize thermal strain, prolonged temperature extremes can lead to cracks in your windshield. Your windshield may also be at a higher risk of developing cracks if you live in a climate where the weather can change suddenly. For example, if you have a long period of below freezing weather, but the temperature rises to 40 or 50 degrees, the change in temperature could cause damage. These defects are more likely to occur due to years of heat strain rather than a warm afternoon in winter.
Improper Windshield Installation Incorrect windshield installation can lead to a loose installation. If the glass is too loose, normal driving can cause violent vibrations that may crack the glass. If you notice a reverberating noise or visible vibration after installing the windshield, consult a technician and adjust the fit to prevent damage. Poor quality glass, cheap and low quality windshields are more prone to manufacturing defects than high quality glass. While the defects may not be immediately visible, small weak areas can become large cracks over time. Rapid Pressure Changes When traveling at very high speeds, rapid changes in pressure are caused by the forces acting on the aircraft, which can change dramatically due to objects pressing on or falling on the windshield. Natural storm phenomena can cause cracks or chips in windshields. While hail is the most common form of storm debris affecting glass, high winds can also blow tree limbs, trash and other objects in front of an airplane. Hail and high-velocity debris can have the same effect as rocks that hit windshields, especially small debris that can develop into a bigger problem.