The Pentagon says it’s temporarily stopping deliveries of Lockheed Martin Corp’s F-35 aircraft after learning from the manufacturer an alloy made in China was in a component of the stealth fighter jet, violating federal defense acquisition rules.The Pentagon said a magnet containing the alloy used in part of the integrated power package posed no security issue.“We have confirmed that the magnet does not transmit information or harm the integrity of the aircraft and there are no performance, quality, safety, or security risks associated with this issue and flight operations for the F-35 in-service fleet will continue as normal,” Defense Department spokesperson Russ Goemaere said.The US operates hundreds of the jets, which come in three configurations, the conventional take-off and landing F-35As, flown by the Air Force; the Marine Corps’ F-35Bs, which can land vertically; and the F-35C, configured for aircraft carrier operations.The F-35 remains safe for flight and we are working with the DOD to resolve the issue as quickly as possible to resume deliveries,” Lockheed Martin said in a statement."