Airmen’s favorite F-35 stealth fighter jets are set to be grounded after an investigation showed there was illegally procured Chinese alloy in the component.

The Pentagon halted Lockheed Martin Corp’s new deliveries of the upgraded F-35 after they discovered the alloy used in the magnet for pumps was made in China. It is not confirmed whether this is affected by the current state of US-China relations, but the Defence Department Spokesman Russell Goemaere said they are checking if the alloy meets procurement regulations.

The F-35 programme office “temporarily paused the acceptance of new F-35 aircraft to ensure the F-35 programme’s compliance…pertaining to specialty metals,” Goemaere’s email notes.

However, since this material was only added in the new version of the F-35, the previous deliveries are not affected by the said compliance check. Furthermore, Goemaere added that the F-35s that were already delivered did not have magnets that transmit “information or harm the integrity of the aircraft and there are no performance, quality, safety or security risks associated with this issue.”

Lockheed Martin also released a statement explaining the issue raised by the Department of Defense (DoD). They noted that the supplier they worked with, Honeywell International Inc (HON.O) is also working on fixing the issue, so they are still part of the conversation when it comes to potentially replacing these parts. Lockheed Martin added that Honeywell “remains committed to supplying high-quality products that meet or exceed all customer contract requirements.”

F-35 Lightning
The new Department of Defense aircraft, the F-35 Lightning II joint strike fighter, taxis across the 33rd Fighter Wing flightline at Eglin Air Force Base, Fla. (Source: Defense Visual Information Distribution Service/getarchive)

“…the issue is related to a magnet on the F-35 Turbomachine manufactured by Honeywell that includes cobalt and samarium alloy.”

Curious Timing

The timing for halting the acceptance of these deliveries came at a very interesting period. It was just last month when the US Air Force sent a press release boasting about the new upgrades and modernization of the F-135 engine.

At that time, Air Force Secretary Frank Kendall said he had a tour of the repair facility where he observed all of the existing procedures in action.