FAA Clears Boeing 737 MAX Software Glitch for Safety

The US Federal Aviation Administration (FAA) has cleared Boeing's 737 MAX software glitch for safety, paving the way for the certification of its largest variant. The issue was first raised by WestJet in August, nearly two years ago, during an entry-into-service test flight. The airline found that the vertical navigation mode on some 737 MAX jets would disengage during approach.

The FAA had delayed certification of the MAX 10 until it completed an analysis of the software issue, which could prevent pilots from accessing automated flight guidance during an unusual landing scenario. However, after reviewing the matter, the agency determined that pilots retain full control of the aircraft and the indications to the flight crew are clear and unambiguous.

The decision removes a late obstacle to certification of the 737 MAX 10 and should ease concerns at airlines that fly the MAX 7, which uses the same software. The FAA is expected to issue a Special Airworthiness Information Bulletin to US airlines and foreign regulators to ensure they're aware of Boeing's bulletin.

Boeing has nearly 1,500 MAX 10s on order from airlines, according to Jefferies' research note. The company will continue to follow the lead of the FAA as its engineers work on the next software update. It is also working with airlines to formalize a procedure that will allow pilots to re-enable automated vertical navigation should this situation occur.