Boeing finds new software bug on 737 Max as key test flight nears


The head of the Federal Aviation Administration, Steve Dickson, told reporters in London that a certification flight for the grounded jet could occur in the next few weeks – a key regulatory step in allowing the aircraft to start flying passengers again.

Dickson said during his remarks that the agency is evaluating the latest software issue.

The stabiliser trim warning light “had been staying on for longer than a desired period,” Dickson said, without providing more detail.

Boeing shares seesawed during Dickson’s remarks. They rose after Dickson’s comments on the timing of the certification flight, then pared gains following the disclosure by Bloomberg News of the new software problem. The stock then recovered, climbing 3.7 per cent to $US341.76 at 12:29 p.m. in New York — the most on the Dow Jones Industrial Average.

Aviation regulators are closely aligned on design requirements for the grounded 737 Max, but may differ country-by-country on the jet’s operational return, Dickson said.

The divergence is likely even though authorities agree more than they disagree on the measures needed for the Max to resume flying after two fatal crashes, Dickson said.

The new issue on the Max involves an alert designed to warn when the so-called trim system, which helps raise and lower the plane’s nose, isn’t working properly, according to two people familiar with the issue who weren’t authorised to comment on it.

One of the people familiar with the trim alert problem confirmed Boeing’s assessment, saying it’s not likely to change the projection of returning the plane to service because the company had built padding into its schedule.

The trim alert issue resulted from Boeing’s redesign of the two flight computers that control the 737 Max to make them more resilient to failure, the two people said.

Boeing last month announced it doesn’t expect the plane to fly again until the middle of the year. After months of missed deadlines and growing tension with the FAA, the company said it was projecting a timeline that included extra room in case new issues arose.

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The company was already at work on a separate software system known as Maneuvering Characteristics Augmentation System that was involved in the two fatal crashes on the plane that killed 346 people and led to the grounding on March 13.

Bloomberg

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