WASHINGTON (BLOOMBERG) – Boeing engineers have discovered a new software problem on the grounded 737 Max that must be patched before the plane can return to service, Federal Aviation Administration (FAA) chief Steve Dickson said.

Dickson confirmed during remarks in London on Thursday that the agency is evaluating the issue.

Boeing representatives did not immediately respond to a request for comment.

A light indicating that the stabliliser trim system wasn’t working properly “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 said a certification flight for the Max could occur in a few weeks, then pared gains following the disclosure by Bloomberg News of the new software problem.

The stock climbed 2.9 per cent to US$339.24 at 11.32am in New York.

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

It is not clear how much of a delay, if any, the issue will create as Boeing finalises numerous fixes required to get its best-selling plane back into service.

One of the people familiar with the trim alert problem said it is not likely to change Boeing’s projection of returning the plane to service by mid-2020 because the company had built padding into its schedule.

The trim alert issue resulted from Boeing’s redesign 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 does not 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 time-line that included extra time in case new issues arose.

The company was already at work on a separate software system known as Manuevering 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.

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