Dublin, Ireland: A United Airlines Boeing 767-300ER operating as ferry flight UA3907 from Munich to Newark Liberty International Airport was forced to make an emergency diversion to Dublin Airport on 15 February 2026 after an electrical system fault emerged during the transatlantic segment of the flight.
The aircraft, registration N657UA, was operating as a maintenance ferry flight repositioning the jet without passengers aboard when the crew detected a malfunction related to the right engine’s Integrated Drive Generator (IDG) shortly after reaching cruise altitude over the North Atlantic.
The IDG is a key component that converts mechanical engine power into electrical energy for aircraft systems. After the fault was identified, the crew engaged the aircraft’s Auxiliary Power Unit (APU) to supply backup electrical power. However, cockpit indications of the aircraft’s electrical systems failed to display properly, raising concerns about the reliability of remaining systems.
In accordance with international aviation procedures, the flight crew declared an emergency indicated by the universal Squawk 7700 transponder code and initially turned back toward the British Isles.
Tracking data showed the aircraft initially set a diversion path toward London Heathrow but later altered course to Dublin, a decision likely influenced by operational considerations including maintenance support and logistical ease for aircraft recovery. The jet landed safely at Dublin Airport without incident and remained on the ground for technical inspection.
According to flight records, the aircraft had been based at Munich Airport for several days prior to departure, where it underwent maintenance activity. The ferry flight was intended to return the aircraft to the United States for service deployment, but the electrical issue prevented the completion of that return journey.
United Airlines confirmed that the flight was cancelled on arrival in Dublin and that the aircraft is being inspected by technical teams before any further operations. No injuries were reported, as there were no passengers on board.
