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[$$] Pentagon Grounds F-35 Fleet After Crash

The Pentagon on Thursday said much of the global fleet of Lockheed Martin Corp. F-35 combat jets was temporarily grounded to investigate engine problems following a Marine Corps plane crash last month. Officials said the fleet of about 320 jets would undergo inspections over the next 48 hours to check fuel tubes in engines that are made by Pratt & Whitney, a unit of United Technologies Corp. The suspect tubes may be installed on around half of the global fleet, limited to planes made before 2016, according to people familiar with the F-35’s production process.