New flaw found in Boeing 737 Max, sources say

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Tests on Boeing Co.'s grounded 737 Max have revealed a new safety risk unrelated to two fatal crashes that led to the grounding of the aircraft, and US regulators are ordering the company to make additional design changes.

Boeing is still working to fix the safety system that has been blamed for the deadly crashes and needs the Federal Aviation Administration to give the jet the green light before it can hit the skies again, according to KING 5.

The FAA said in a Tweet that it would lift Boeing's "prohibition order when we deem it safe to do so".

Remember the Boeing 737 Max conundrum that began earlier this year?

In each of those two crashes, investigators say bad information from an external sensor caused an automated feature known as the Maneuvering Characteristics Augmentation System (MCAS) to automatically push the planes' noses down.

The information comes from Reuters, which claims the FAA discovered a second flaw with the Boeing 737 Max during a simulator test conducted last week.

Asked about the new potential risk, Boeing said it is "working closely with the FAA to safely return the MAX to service". Both Southwest Airlines and American Airlines, the other two U.S. airlines that operate 737 MAX 8s, announced earlier this month that they would be canceling flights using the plane until September as well.

The FAA released an updated statement on the 737 MAX Wednesday evening stating that they "recently found a potential risk that Boeing must mitigate" as they evaluate updates to the Boeing 737 MAX software.

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A statement from the regulatory agency says as part of a process created to discover and highlight potential risks, "the FAA found a potential risk that Boeing must mitigate".

Boeing later admitted that an "optional" set of indicators it sells separately could potentially have helped prevent the tragedies, but only 20 percent of the MAX jets had them.

This led countries across the world to ground all the operating Boeing 737 MAX aircraft.

This all comes after CNN cited unnamed sources in reporting that while testing a supposedly fixed version of the MCAS software in a simulator, pilots found that a microprocessor in the anti-stall system would lock up.

A total of 346 people died in two 737 MAX crashes in Indonesia and Ethiopia.

Exercises on a Boeing 737 Max simulator in recent days showed pilots might have difficulty responding to the newly identified failure, the person said.

A hardware fix could add new delays to the plane's return to service.

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