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Boeing said Sunday a standard alert that had been disabled on the 737 Max jet due to a glitch was not necessary to safely operate the aircraft.
Boeing's statement comes after Southwest Airlines, the company's largest 737 Max customer, said Boeing did not inform it about the disabled alert until after the fatal crash of a Lion Air 737 Max in Indonesia last October.
Known as an angle-of-attack disagree light, the indicator flashes if an aircraft's angle-of-attack sensors transmit faulty data about the pitch of the plane's nose.
Boeing said the disagree light was included as a standard, stand-alone feature on the 737 Max, but it was linked to another optional feature called an angle-of-attack indicator. The disagree light would only work if airlines opted for the angle-of-attack indicator.
In 2017, well before the Lion Air crash, engineers discovered the 737 Max display software didn't meet the requirements for the disagree alert. Boeing then followed its "standard process for determining the appropriate resolution of such issues," the company said in a statement Sunday.
"That review, which involved, multiple company subject matter experts, determined that the absence of the AOA Disagree alert did not adversely impact airplane safety or operation," the statement continued. "Accordingly, the review concluded, the existing functionality was acceptable until the alert and the indicator could be de-linked in the next planned display system software update."
Though engineers were investigating, Boeing said senior company leadership wasn't involved in the review and "first became aware of this issue in the aftermath of the Lion Air accident."
The 737 Max was grounded by the FAA in March in the wake of two fatal crashes that killed 346 people. Just months after the Lion Air crash, a Boeing 737 Max 8 went down just minutes after taking off from Addis Ababa, Ethiopia.
Several major airlines have extended Max flight cancellations through the summer. American has canceled Max flights through Aug. 19, totaling 115 flights per day, while Southwest has canceled through Aug. 5 and United through June 5.
In Sunday's statement, Boeing said it discussed the status of the AOA disagree alert with the Federal Aviation Administration after the Lion Air crash. The company convened a safety review board in December 2018, which confirmed that the absence of the instrument did not present a safety issue, Boeing said.
Boeing plans to issue a software update to implement the AOA disagree alert as a standard, standalone feature when the Max returns to service.
Here is Boeing's full statement:
On every airplane delivered to our customers, including the MAX, all flight data and information needed to safely operate the aircraft is provided in the flight deck on the primary flight deck displays. This information is provided full-time in the pilots' primary field of view, and it always has been.
Air speed, attitude, altitude, vertical speed, heading and engine power settings are the primary parameters the flight crews use to safely operate the airplane in normal flight. Stick shaker and the pitch limit indicator are the primary features used for the operation of the airplane at elevated angles of attack. All recommended pilot actions, checklists, and training are based upon these primary indicators. Neither the angle of attack indicator nor the AOA Disagree alert are necessary for the safe operation of the airplane. They provide supplemental information only, and have never been considered safety features on commercial jet transport airplanes.
The Boeing design requirements for the 737 MAX included the AOA Disagree alert as a standard, standalone feature, in keeping with Boeing's fundamental design philosophy of retaining commonality with the 737NG. In 2017, within several months after beginning 737 MAX deliveries, engineers at Boeing identified that the 737 MAX display system software did not correctly meet the AOA Disagree alert requirements. The software delivered to Boeing linked the AOA Disagree alert to the AOA indicator, which is an optional feature on the MAX and the NG. Accordingly, the software activated the AOA Disagree alert only if an airline opted for the AOA indicator.
When the discrepancy between the requirements and the software was identified, Boeing followed its standard process for determining the appropriate resolution of such issues. That review, which involved multiple company subject matter experts, determined that the absence of the AOA Disagree alert did not adversely impact airplane safety or operation. Accordingly, the review concluded, the existing functionality was acceptable until the alert and the indicator could be delinked in the next planned display system software update. Senior company leadership was not involved in the review and first became aware of this issue in the aftermath of the Lion Air accident.
Approximately a week after the Lion Air accident, on November 6, 2018, Boeing issued an Operations Manual Bulletin (OMB), which was followed a day later by the FAA's issuance of an Airworthiness Directive (AD). In identifying the AOA Disagree alert as one among a number of indications that could result from erroneous AOA, both the OMB and the AD described the AOA Disagree alert feature as available only if the AOA indicator option is installed.
Boeing discussed the status of the AOA Disagree alert with the FAA in the wake of the Lion Air accident. At that time, Boeing informed the FAA that Boeing engineers had identified the software issue in 2017 and had determined per Boeing's standard process that the issue did not adversely impact airplane safety or operation. In December 2018, Boeing convened a Safety Review Board (SRB) to consider again whether the absence of the AOA Disagree alert from certain 737 MAX flight displays presented a safety issue. That SRB confirmed Boeing's prior conclusion that it did not. Boeing shared this conclusion and the supporting SRB analysis with the FAA.
Boeing is issuing a display system software update, to implement the AOA Disagree alert as a standard, standalone feature before the MAX returns to service. When the MAX returns to service, all MAX production aircraft will have an activated and operable AOA Disagree alert and an optional angle of attack indicator. All customers with previously delivered MAX airplanes will have the ability to activate the AOA Disagree alert.
—CNBC's Amanda Macia and Spencer Kimball contributed to this report.