Thousands of jet engines must replace faulty turbine disks

US aviation regulators are proposing a rule to fix a manufacturing defect in certain jet engines. This means thousands of engines on commercial aircraft will need to have specific turbine disks removed and replaced.

A manufacturing error means that some low-pressure turbine disks in CFM LEAP engines have incorrect grain size. This defect can lead to engine failure. The proposed rule forces airlines to replace these parts, preventing potential accidents.