The Federal Aviation Administration (FAA) is looking into a software issue in some Boeing 737 Max aircraft that could cause an automated flight guidance system to stop working during a go-around — a maneuver pilots use when they decide to abort a landing. FAA Administrator Bryan Bedford told CBS News on Monday that the agency would delay certification of the Max 10 model while it reviews the issue and finds temporary solutions. The problem occurs in rare situations where a pilot is using a precision landing approach with autopilot engaged and makes changes to their pre-programmed flight plan. This could lead to an issue with the flight management computer, which might cause the vertical navigation system, known as VNAV, to disengage and switch to a less advanced level of automated pitch control. VNAV is designed to automatically maintain the pre-planned altitude at various points along the flight path. If the glitch occurs, pilots would need to take extra steps during their next landing approach. This scenario is likely to happen at low-altitude airports where pilots already have a high workload. “How busy do you want your crew to be?” one airline source told CBS News about the glitch. “Are you introducing distractions at the worst possible moment?” Boeing informed all 737 operators last month about the software issue, which could prevent pilots from having access to automated flight guidance during a specific landing scenario. The company said it shared information that reinforced existing pilot procedures for safely handling such cases and that engineers are working on a software update to permanently fix the issue. A Boeing spokesperson said that even if VNAV disengages, the autopilot will continue to function, adding that all pilots are trained to land safely without it. In a bulletin sent to airlines, Boeing stated that the glitch is not an immediate safety issue. It was found in versions 14 and 14.1 of the operating system for the Max's flight management computer. The software in question was developed by GE Aerospace, not directly by Boeing. A GE spokesperson told CBS News that safety is their top priority and that they are working closely with Boeing and supporting the FAA's evaluation. Southwest Airlines and United Airlines have informed Boeing they will not accept delivery of new aircraft with that operating system, instead opting for a previous version. Several other airlines, including Alaska Airlines, American Airlines, and Allegiant Air, told CBS News that none of their in-service 737 Max fleets use the software version in question. The issue was first reported by the Wall Street Journal. Boeing was initially informed of the problem by an airline in November 2024 and determined in February 2025 that it was not a safety issue. However, additional information from operators this year prompted Boeing to launch a formal safety review board. The findings of that board were sent to the FAA this month and will be reviewed by the Corrective Action Review Board (CARB). Boeing had previously planned to release a software fix in 2028 and issue updated guidance for pilots in November, but it is now working to speed up both efforts. The FAA review could delay the certification of the 737 Max 10, the largest variant of the Max, which was nearly ready for certification but has been years behind schedule. The issue could also delay deliveries of the recently certified 737 Max 7, which is expected to be delivered mostly to Southwest Airlines.