Boeing 737 MAX new software fault could cause navigation function interruption.

Boeing discovered a software fault in the 737 MAX that could cause the autopilot function to fail in certain landing scenarios. According to some industry insiders, Southwest Airlines and United Airlines have told Boeing they do not want newly delivered 737 MAX aircraft equipped with the defective software. The U.S. Federal Aviation Administration is investigating the issue, which could affect certification of Boeing's latest 737 model. The company is developing related operating procedures for pilots and working on a software fix; the Federal Aviation Administration's investigation could affect approval of the new model.