GAO: ‘Action Needed’ to Solve F-35 Block 4 Issues

Even after reducing the scope of Block 4 F-35 upgrades, Lockheed Martin will still needs two years to develop and install planned improvements, the Government Accountability Office said in a new audit of the fighter program. Details about what upgrades will be carried into production, as well as a new cost estimates won’t be available until this fall, the report said.