Boeing has begun preparing their static test 777X for fatigue testing by setting the aircraft up in its “cage”, indicating major structural tests are just around the corner. The aircraft, a 777-9 with designation WY987, was transferred from the 40-51 apron at Paine Field to the west parking lot on Sunday May 11th before heading down Perimeter Road to the 40-41 fatigue test structure. Boeing prepares 777X for fatigue testing Paine Airport (Matt Cawby) – Twitter What looks to be the skeleton of a large hangar is actually a complex steel structure weighing around 680t (1,500,000lb) that will tie itself to the aircraft and simulate different loads on all major components, imitating everyday operations in a worst case environment. A large collection of pulleys, steel cable and hydraulic actuators will twist, pull, push and vibrate the aircraft, with sensors gathering data for engineers to analyse. The last time Boeing used a full-scale fatigue test structure was 10 years ago with the 787 Dreamliner.