A whistleblower lawsuit is casting light on some questionable testing practices at defense contractor Northrop Grumman. According to Todd Donaldson, the Northrop employee filing the suit, the company sold GPS systems to the Department of Defense after faking a crucial part of testing.

Donaldson claims that the faked tests of the LN-100 have led to "a grave danger of erroneous navigation, leading to crashes and weapons failing to hit their targets."

While neither Donaldson nor NG cited specific instances of the LN-100 causing issues, the US Air Force did blame the system on the crash of an armed Predator drone in Djibouti in May of 2011, Stars and Stripes reports. In that particular case, the system registered the UAV's altitude at 400 feet higher than it was.

Aside from the Predator, the LN-100 is used in the F/A-18 Hornet, F-22 Raptor and RQ-4 Global Hawk, among other aircraft. Donaldson's suit was originally filed two years ago, but it was sealed from the public until recently.


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