Have hazy windshields? Textron Aviation included a haze removal procedure in ME-TP-004 Model Communique (a Textron Aviation account is required, registration is free). Highlights are listed below, view the communique for full details.
ATA 56 – King Air Windshield Haze Removal Procedure
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Technical Support has received reports that some King Air windshields have developed a visible haze on the glass panes. PPG Aerospace Transparencies, the manufacturer of the windshield, investigated this condition and provided the following explanation and a procedure to correct this condition:
A uniform haze can be experienced as the result of an interaction between the different interlayers under a certain limited condition, which is the long-term exposure (two-plus days) to temperatures between 5-20 degrees F.
This condition can often be treated by operating the window heating system for several hours. It is possible to utilize other heat treatments for the same effect, such as PPG Surface Seal curing kits (heating blankets), which operate at a controlled temperature range.
Paul Sneden, King Air Maintenance Academy instructor, said on a recent Facebook Group thread, "For those not aware, fogginess/haziness is nothing to get too worried about. It happens to the King Air (and other) windshields given the right temp and humidity conditions. It can be cured in a few hours with a heat blanket or extended run of windshield heat while on ground power. Model Communique ME-TP-004 covers this topic."
ME-TP-004 Model Communique
