Boeing is addressing a new software issue in the 737 MAX that prevents the jet's flight-control computers from powering up as required before flight. This glitch is the latest in a series of technical problems that have complicated and delayed the grounded fleet's return to service, threatening another schedule slip.
Prior to the discovery of this problem, Boeing and the Federal Aviation Administration (FAA) had aimed for a key certification flight by the end of January. However, this new issue means that date is likely to slip into at least February. The length of the delay will depend on how quickly Boeing engineers can resolve and verify the fix, though coordination with international regulators could add further complications.
This new software problem follows earlier disclosures regarding the 737 MAX. For instance, in June, the FAA identified a potential flaw with a microprocessor in the flight-control computer, leading Boeing to undertake a fundamental software redesign. This redesign aimed to have the system take input simultaneously from both flight-control computers, rather than just one, to enhance reliability and address issues with the Maneuvering Characteristics Augmentation System (MCAS). Boeing's CEO, Dennis Muilenburg, had initially projected the MAX could return to service by the end of summer after that issue, but delays have persisted.
Previous concerns have also been raised about other 737 models. The National Transportation Safety Board (NTSB) issued urgent safety recommendations regarding a potential rudder malfunction due to a manufacturing fault in a component on some 737s, including older models and potentially some MAXs flown by foreign carriers. Boeing stated it had informed operators about this condition in August and was reviewing NTSB recommendations, which included developing better instructions for pilots on handling rudder jams.
