buckeem,
The AOL was to check the type of screens fitted to the aircraft. There are 3 types of screens that can be fitted, vis- glass, stretched acrylic and cast acrylic. The 2 types of acrylic have different characteristics due to the manufacturing process.
It details a way of checking the type of acrylic you may have fitted and has a form to fill in with serial number/reg/type of screen that then gets sent off to Sikorsky.