EASA SIB SAIB-2026-17
Vertical Navigation Approach Disconnect Following Missed Approach
Summary
The FAA Aviation Safety Information Bulletin SAIB: 2026-17 titled "Vertical Navigation Approach Disconnect Following Missed Approach" informs operators of Boeing 737-600/-700/-800/-900/-900ER/-7/-8/-9/-8200 series airplanes equipped with Flight Management Computer software versions U14.0 or U14.1 about a potential vertical navigation (VNAV) mode disconnect during subsequent approaches after a missed approach. This bulletin provides information on the anomaly but does not mandate any regulatory action.
What Changed
This bulletin introduces awareness of an anomaly in the FMC software versions U14.0 and U14.1 that causes VNAV mode to disconnect when navigating direct to a waypoint not associated with the approach after a missed approach. It clarifies that this condition is not considered unsafe and does not require an airworthiness directive or mandatory corrective action at this time.
Why It Matters
This information is important for aviation professionals because it affects flight crews operating affected Boeing 737 models by requiring additional procedural steps to use VNAV on subsequent approaches after a missed approach. Understanding this anomaly helps operators maintain safe and efficient flight operations and ensures compliance with FAA guidance without unnecessary regulatory burden.
What To Do
Operators of affected Boeing 737 aircraft should follow Boeing's published guidance documents, including the Boeing Fleet Team Digests and Flight Crew Operations Manual Bulletin issued in October 2026, to manage the VNAV disconnect scenario. There is no mandatory compliance deadline, but adherence to the recommended procedures is advised to ensure operational safety.
Your fleet's weekly digest
AI-summarized regulatory changes, compliance deadlines, and action items — filtered to your aircraft, every Monday.
AI-generated summary from official EASA source document. Always verify against the original.