Boeing 737 MAX Faces Scrutiny Over VNAV Software Glitch
Boeing has alerted airlines to a software issue affecting some 737 MAX aircraft. This glitch can lead to the disconnection of vertical navigation guidance, known as VNAV, under specific circumstances during landing. While the autopilot system remains functional, the loss of automated vertical guidance in certain demanding scenarios has prompted a review by the Federal Aviation Administration (FAA).
The problem arises during a complex flight sequence: pilots execute a precision approach, then decide to abort the landing. Following this missed approach, if the flight crew alters the aircraft’s pre-programmed route, the flight management computer may disengage the VNAV function. This can occur at low altitudes, making it a situation that requires careful handling by the flight crew. Boeing has stated that existing pilot training and procedures are designed to manage such scenarios safely.
Understanding the VNAV Software Fault
The fault is linked to specific versions of the flight management computer’s operating system, identified as versions 14 and 14.1.
Frequently Asked Questions
What is the software issue affecting the Boeing 737 MAX?
Some 737 MAX aircraft have a software glitch that can cause the VNAV (vertical navigation) guidance to disconnect during landing approaches.
When does the VNAV software glitch occur?
The issue happens after a pilot aborts a landing and then changes the aircraft’s planned route, potentially at low altitudes.
Is the autopilot still working when VNAV disconnects?
Yes, the autopilot system itself remains functional, but the automated vertical guidance is lost in specific situations.
What is Boeing’s stance on this issue?
Boeing states that current pilot training and procedures are sufficient to handle these scenarios safely and has alerted airlines to the problem.
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