Paris Air Show

Boeing Chief Executive Dennis Muilenburg speaks during a news conference in April after the company’s annual shareholders meeting in Chicago.

PARIS • The chief executive of Boeing said the company made a “mistake” in handling a problematic cockpit warning system in its 737 Max jets before two crashes killed 346 people, and he promised transparency as the aircraft maker works to get the grounded plane back in flight.

Speaking before the industry-wide Paris Air Show, Boeing CEO Dennis Muilenburg told reporters Boeing’s communication with regulators, customers and the public “was not consistent. And that’s unacceptable.”

The U.S. Federal Aviation Administration has faulted Boeing for not telling regulators for more than a year that a safety indicator in the cockpit of the top-selling plane didn’t work as intended.

Boeing and the FAA have said the warning light wasn’t critical for flight safety. But the botched communication has eroded trust in Boeing as the company struggles to rebound from the passenger jet crashes in Indonesia and Ethiopia.

“We clearly had a mistake in the implementation of the alert,” Muilenburg said.

Pilots also have expressed anger that Boeing did not inform them about the new software that’s been implicated in the fatal crashes.

Muilenburg expressed confidence that the Boeing 737 Max would be cleared to fly again later this year by U.S. and all other global regulators.

“We will take the time necessary” to ensure the Max is safe, he said.

The model has been grounded worldwide for three months, and regulators need to approve Boeing’s long-awaited fix to the software before it can return to the skies.

Muilenburg called the crashes of the Lion Air and Ethiopian Airlines jets a “defining moment” for Boeing, but said he thinks the result will be a “better and stronger company.”

In the United States, Boeing has faced scrutiny from members of Congress and the FAA over how it reported the problem involving a cockpit warning light.

The company discovered in 2017 that a warning light designed to alert pilots when sensors measuring the angle of a plane’s nose might be wrong only worked if airlines had purchased a separate feature.

The angle-measuring sensors have been implicated in the Lion Air crash in Indonesia last October and the Ethiopian Airlines crash in March.

The sensors malfunctioned, alerting software to push the noses of the planes down. The pilots were unable to take back control of the planes.

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