Looking for Long-Term Structural Fatigue (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories' Dennis Roach, left, and Ken Harmon (retired) examine the inside of a Boeing 737 for long-term structural fatigue. Nondestructive techniques allow inspectors to assess the integrity of aircraft structures without disassembly. Credit Photo by Randy Montoya Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.