FAA Faces Dilemma Over 737 MAX Wiring Flaw That Boeing Missed
"If a hot short occurs between the power wire and ... command wire, the stabilizer can go to the full nose-down position"
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February 16, 2020 - by Dominic Gates for seattletimes.com
During the original design and certification of Boeing's 737 MAX, company engineers didn't notice that the electrical wiring doesn't meet federal aviation regulations for safe wire separation. And the Federal Aviation Administration (FAA) failed to detect Boeing's miss.
The wiring vulnerability creates the theoretical potential for an electrical short to move the jet's horizontal tail uncommanded by the pilot, which could be catastrophic.
If that were to happen, it could lead to a flight control emergency similar to the one that brought down two MAX jets, causing 346 deaths and the grounding of the aircraft.
Because this danger is extremely remote, the FAA faces a dilemma over what to do about it. The issue has complicated the return of the MAX to service after a grounding that is edging close to one year.
Modifying the wiring would be a delicate and expensive task, and Boeing this week submitted a proposal to the FAA, arguing that it shouldn't be required...
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