Why the F-111’s Wing Snapped Off Mid-Flight



In December 1969 an F-111A lost its left wing in a low-level pull-up. The cause was a hidden manufacturing flaw in the steel wing pivot fitting, and the fix was a fleet-wide cold proof test at minus forty degrees.

#F111 #Aardvark #SwingWing #AviationHistory #InsideWarMachines

Sources: National Museum of the U.S. Air Force (General Dynamics F-111A); USAF Aircraft Structural Integrity Program / AFHRA records of the F-111 cold proof test. Illustrative 3D reconstruction; slow motion, separation, flaw size and test rig illustrative.

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12 Comments

  1. You completely missed the opportunity to discuss the emergence of the modern Damage Tolerance philosophy, which can be traced directly back to this very incident.

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