DESIGN ISSUE: A “design artifact” unique to a new electrical starter/generator configuration is the likely cause of the in-flight dual generator failure on F-35A test aircraft AF-4 on March 9, according to the Joint Program Office (JPO). The newer engine-driven generator is installed on test jets AF-4, BF-5 and CF-1, as well as low-rate initial production F-35As AF-6 and -7, which remain grounded. The other aircraft — AF-1/2/3 and BF-1/2/3/4 — have the older generator configuration. As a ...

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