FAA issues service bulletin on VNAV disconnect issue for 737‑800/900ER with U14 software
Based on · First reported
Sources
- The FAA released an informational Service Bulletin on 3 October 2026 addressing a possible VNAV mode disconnection on Boeing 737‑800 and 737‑900ER aircraft equipped with FMC software versions U14.0 or U14.1.
- The fault can occur after a go‑around when crews navigate directly to a waypoint that is not part of any approach or transition, but the FAA’s CARB concluded it does not create a safety problem because pilots retain full control and indications remain clear; the bulletin references Boeing guidance published on 2 October 2026 and recommends following it, though the recommendations are not mandatory.
Why it matters
Airlines operating affected 737‑NG and 737‑MAX models can continue flights without mandatory corrective action, but should apply Boeing’s advisory procedures to manage the VNAV scenario.
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