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According to Bloomberg:
Boeing Co. told U.S regulators on Friday that it didn't see the need to undertake a potentially costly fix for a wiring issue on the company's grounded 737 Max, according to two people familiar with the briefing.
The planemaker found in an audit last year of the 737 Max that wires were bundled improperly in a way that could trigger a failure similar to what happened in two crashes of the plane in which a total of 346 people died.
U.S. law requires wiring that could cause a hazardous condition in a failure to be separated from other wires. [...]
The wiring issues have been found in more than a dozen locations on the 737 Max.
From The Seattle Times [May require that Ad-Blockers be switched off, or at least disable style sheets]:
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. [...]
"There are 205 million flight hours in the 737 fleet with this wiring type," a Boeing official said. "There have been 16 failures in service, none of which were applicable to this scenario. We've had no hot shorts."
In addition, Boeing says pulling out and rerouting wires on the almost 800 MAXs already built would pose a potentially higher risk of causing an electrical short, because insulation could chafe or crack in the process of moving the wires.
However, an FAA safety engineer familiar with the issue, who asked not to be identified because he spoke without agency permission, said agency technical staff have been clear that the wiring doesn't comply with regulations and have told their Boeing counterparts it has to be fixed.
(Score: 2) by Runaway1956 on Sunday February 16 2020, @09:50AM (1 child)
Just two weeks ago, I left a note for my boss, with a sentence to that effect. "Call the manufacturer, and tell them that we want their engineers to come out here and DEMONSTRATE how this is done!"
Odd that I didn't make that connection here. ;^)
(Score: 4, Insightful) by sjames on Sunday February 16 2020, @10:11PM
I would love to see more of that sort of thing.
Perhaps even as a reality TV sort of challenge. The engineering teams from the major auto manufacturers are forced to perform routine maintenance and common repairs on the car they designed live in prime time. They each get a set of standard tools that a well equipped shade tree mechanic might have.
If they have to call for a specialty tool, they lose points. If the tool is restricted by licensing or only available from the manufacturer, they get paddled with a shop manual by a select group of angry mechanics.