Windshields and side windows forward of the pilot seat have restrictions on the amount of light that can be blocked. However, there are acrylic sheeting that does block UV. Polycast is one brand and used by a number of 3rd party aircraft window producers.
What is the limit and where is it published? Just wondering as my next big project is replacing all the "glass" in my plane
I believe it's 70% transmission, but can't find a source. The companies that supply airplane windows know and meet the requirements. I have the tinted option on my side windows and it's not at all noticeable, even at night. But the UV blockage is very good. If I ever replace the windscreen, it will be the same. I got the neutral gray vs green.
Part 23.775. However, it was absorbed into an AC with the Part 23 rewrite. And even though CAR 3 did not address the "luminous transmittance value of not less than 70 percent" this became the industry standard on many levels.
I have the grey tinted windows on the front side. Helps a bit with temperature, but windscreen is clear, so that offsets it. Can't tell they are tinted at all. No effect on night vision. I will do the windscreen if I ever have cause to take it out. I also did cling darker tint on the rear windows (Archer, so 4 rear windows). That helped a lot with heat, but at the expense of clarity. You can see fine, but the optical quality is less than the tinted plexi.
