The ATRR Evaluation Process
Every repair or restoration of an acrylic transparency begins with a complete Evaluation of the windows and/or lenses. This process is performed as per the ATRR Technician Checklist and is completed prior to any aircraft window repair.

Prior to the Evaluation the window or lens is cleaned using water and bare flesh to remove debris. Pure detergent liquid may be added to help soften stubborn debris.

Certified technicians measure the thickness of the transparency to compare to the manufacturer's minimum thickness specifications to ensure that the transparencies are within tolerance. Acrylic thickness is measured by using an Ultrasonic Thickness Gauge, recording measurements in six to twelve locations on the window.

ATRR utilizes the Dakota MX-3 and the Positector UTG Ultra Sonic Thickness Gauges.

The depth of the damage (scratch, pit or crazing) is measured using an Optical Depth Micrometer. The depth of the damage is subtracted from the current thickness of the window to determine the final thickness after the article is repaired. That thickness measurement is compared to the manufacturer's minimum thickness specifications to ensure a safe and legal repair.

The completed repair Traveler Packet contains the Window Maps - BEFORE, Window Maps - AFTER and the complete Evaluation.