All 441 of the F-15 fighter interceptors were grounded after the jet breakup, and 182 were found to have major structural components that didn’t meet original manufacturing specifications, service officials told reporters in a January 2008 news conference.
Most of the F-15s grounded were cleared to return to flight by February 2008 after undergoing additional inspections as the investigation was begun.
“The cause of the accident was determined to be failure of the upper-right longeron,” according to the inspector general’s summary of the investigation.
The contract specification required the longeron to be 0.10 inches (0.25 centimeters) thick, according to the report.
“The investigation revealed that the Boeing-supplied longerons varied in thickness from 0.039 to 0.073,” the inspector general said.
Interesting to me how many people here were convinced the root cause had to be fatigue, but in fact it was that Boeing supplied nonconforming parts. Same people proceeded to say fatigue was the main reason we had to push forward with F-22 and F-35, etc.
Also interesting how Boeing is paying a mere $1M to the government even though the cost of the F15 plust the medical bills for the pilot far exceed $1M and how the issue was only disclosed via an inspector general's report to Congress.
Stinks to the high heavens, says I.