All US Air Force F-35s are flying again after ejection seat checks (defensenews.com) 16 Aug 2022 "...Service technicians inspected 706 cartridges from 349 F-35s, as well as additional supplies of spare cartridges, Air Combat Command spokeswoman Alexi Worley said in an email Monday. The Air Force has about 376 F-35As in its fleet.
Of those cartridges, inspectors felt four could have problems and were replaced. Worley said further inspection of those four suspect cartridges showed they were not defective...."
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"...Martin-Baker, the company that manufactures the seats, also found two more defective cartridges in its own stores in April. The company also found, during a quality check that followed, that its production line was creating defective cartridges...."
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"...Martin-Baker said in a statement to Air Force Times on Aug. 7 that ejection seat checks the military started in July uncovered no defective parts in any aircraft, leaving the one found at Hill Air Force Base in April the only bad cartridge found in an F-35."