Our customers want to run computers in the back of the airplane during flight, and they complain that they can't see the screens, can we make it darker? My coworker and I go to Canadian Tire and buy deluxe windshield sunshields, velcro, duct tape, and marker pens. We also bring scissors and a newspaper. We have a project.
Our first step is to make window sized templates with the newspaper. We hold up the newspapers to the windows and trace out the shape and size we want with the markers. We want them a bit bigger than the windows so we can velcro the sunshades onto the window frames. It turns out that we have three different sizes of windows, as they get smaller towards the back of the airplane. I was afraid they might all be different, so that's actually a relief. It takes a few iterations of taping newspapers together, tracing and cutting before we're happy with the results.
Next we lay out our templates on the silver windshield shades and trace around them with the markers. We cut out the window shapes. We weren't sure if the structure of the shield material would hold up after we cut them, because the edges are sealed with cloth tape, but it turns out that they're made of bubblewrap coated on each side with shiny foil, and they stay glued together just fine without the edging. It's a prety good design, really: foil to reflect the light and bubblewrap to provide insulation against the transmission of heat. We could use them overnight in the winter to keep the cabin warmer, too.
We hold the silver panels up to the windows to make some trimming adjustments with the scissors, and then finally stick put little patches of industrial-strength velcro on our panels and on the corners of the windows. It's really dark now! It will help me, too, because now I won't have beams of light coming in the back windows to glare off my instruments.
On my next flight with the darkened windows I amend my passenger briefing to note that in an emergency I will ask them to pull down the screens before landing so that they can see the surroundings, in order to choose the safest emergency exit to use.