April 7th 1999 – A Boeing KC-135R-BN Stratotanker, 57-1418, c/n 17549, of the 153rd Air Refueling Squadron, Air National Guard, was undergoing maintenance at the Oklahoma ALC, Tinker AFB, Oklahoma, when the cabin was over-pressurized during a test and ruptured, tearing a massive 35 foot hole in the aft fuselage, allowing tail section to commence a self-executed rapid kinetic disassembly, and unceremoniously dropped to the ground.
Whoops! I bet they still use that disaster as a training example of what NOT to do.
These progressive high school girls learn the finer points of auto mechanics in 1927.