The aircraft maker is drafting emergency cockpit procedures and a software patch to address a failure in automated landing systems. A Federal Aviation Administration investigation into the instability may now hinder the regulatory approval of a new narrowbody model, as Boeing works to resolve the navigation issues.

The malfunction disrupts flight guidance during the approach phase and can knock out autopilot functions after a missed landing, which increases the workload for flight crews. Boeing first flagged the risk after discovering that pilots on 737 MAX jets could lose access to automated tools, a flaw that may further delay the delivery of its latest aircraft.