04:05 PM EDT, 08/20/2024 (MT Newswires) -- Shares of Boeing ( BA ) declined on Tuesday as the company said it paused testing of the 777X aircraft after discovering that a structural component performed unexpectedly during scheduled maintenance.

The part is located between the engine and airplane structure, the jet maker told MT Newswires in an email. The company is inspecting the flight test fleet for this condition.

"During scheduled maintenance, we identified a component that did not perform as designed," the company said. "Our team is replacing the part and capturing any learnings from the component and will resume flight testing when ready."

Shares of Boeing ( BA ) closed 4.2% lower on Tuesday.

The Air Current reported the news on Monday.

Each 777-9 engine includes two of these parts, which means there is redundancy, according to Boeing ( BA ). The component is custom to the 777-9. Boeing ( BA ) said it is keeping the Federal Aviation Administration fully informed on the matter.

Boeing ( BA ) began certification flight testing for the 777-9 in July. The plane is the largest in the 777 family with capacity for 426 passengers and a range of 7,295 nautical miles.

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