Service technicians inspected 706 cartridges from 349 F-35s, as well as additional supplies of spare cartridges.
Military officials won’t answer whether they’ve found the problem on any planes.
Air Combat Command aims to finish checking its F-35As for faulty ejection seats by mid-October.
The Air Force plans to fly the new B61 bomb on the F-35A and other fighter and bomber jets.
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