May 11, 2021

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New Electrical Flaw Grounds More Than 60 737 MAXs, Adding To Boeing’s Woes

New Electrical Flaw Grounds More Than 60 737 MAXs, Adding To Boeing’s Woes

phalse phace writes: A minor change in Boeing’s 737 MAX manufacturing process that was insufficiently vetted caused an electrical system problem that on Friday temporarily grounded more than 60 of the aircraft — out of almost 200 MAXs that have returned to service since December. While this latest manufacturing flaw is unrelated to the flight-control system implicated in two fatal crashes that grounded the MAX for nearly two years, it slows the positive momentum that had begun to build as more MAXs took to the air and new orders came in from United, Alaska and Southwest.

The problem, according to two people with knowledge of the modified manufacturing process, arose when a backup electrical power control unit was secured to a rack on the flight deck with fasteners — in place of the rivets previously used. This change was executed in such a way that it did not provide a complete electrical grounding path to the unit. The lack of secure electrical grounding could potentially cause malfunctions in a variety of electrical systems, such as the engine anti-ice system and the auxiliary power unit (APU) in the plane’s tail. Boeing said it discovered the issue “on a production airplane during normal build activity” and that inspections are needed to verify “that a sufficient ground path exists” for this control unit.

Read more of this story at Slashdot.