Installation procedures for aircraft transparencies are both complicated and delicate. Most mechanics will attest to the fact that it is very easy to make a costly mistake when dealing with such delicate parts as transparencies. This is why Perkins Aircraft Windows offers on-site installation of our products. Our crews of highly-trained FAA certified repairmen only work on windows, so they are more efficient and knowledgeable about the installation of these fragile parts of the airframe. If one of our installation crew members damages a $20,000 windshield of ours, we will supply a replacement at our own expense. How many independent A&P mechanics can make that kind of guarantee?