Emergency declared during transatlantic crossing
DUBLIN — A Boeing 767 operated by United Airlines made an emergency landing at Dublin Airport on Feb. 15 after an electrical system fault forced the crew to abandon a planned transatlantic ferry flight from Munich to Newark, the airline confirmed.
The aircraft, operating as flight UA3907, had departed Munich Airport on a maintenance ferry flight to Newark Liberty International Airport when the crew encountered a technical problem shortly after reaching cruise altitude over the Atlantic Ocean.
United said the flight was canceled following its arrival in Ireland. “United Airlines confirmed the flight cancellation following arrival in Dublin, and the aircraft remains under technical inspection before returning to service.”
The aircraft landed safely in Dublin. No passengers were on board and no injuries were reported.
Electrical generator fault prompted diversion
Flight UA3907 was not a scheduled commercial passenger service but a maintenance ferry flight repositioning a Boeing 767-300ER back to the United States. Ferry flights operate without passengers and are commonly used by airlines to move aircraft between maintenance bases or reposition planes for operational needs.
According to flight details and operational information, the crew encountered a malfunction involving the right engine’s Integrated Drive Generator, a critical component that supplies electrical power from the engine to the aircraft’s onboard systems.
In response, the pilots activated the aircraft’s Auxiliary Power Unit to provide backup electrical power.
Additional reports indicated that the cockpit’s electrical systems display page failed to appear when selected. This display provides essential information about the aircraft’s electrical status. Without full electrical redundancy, the aircraft was unable to continue extended twin-engine operations across the Atlantic.
As a precaution, the crew declared an emergency using the international Squawk 7700 code and began diverting toward the British Isles.
Diversion plan shifted from London to Dublin
Initial flight tracking data suggested the aircraft was preparing to divert to London Heathrow Airport, one of Europe’s primary diversion airports for transatlantic flights. The aircraft began descending over the United Kingdom, indicating preparations for landing.
However, while over central England, the aircraft climbed again and changed course west toward Ireland.
Airline dispatchers subsequently directed the crew to divert to Dublin Airport instead, likely due to the availability of maintenance support, operational considerations, and logistical efficiency for aircraft recovery.
The aircraft landed safely without further incident.
Aircraft had recent maintenance activity in Munich
Flight records show the aircraft had remained in Munich for approximately four days before the ferry flight, indicating ongoing maintenance work prior to its attempted return to the United States.
Passengers scheduled on earlier Munich-to-Newark services reported cancellations linked to maintenance issues involving the same aircraft. Some travelers were rebooked on alternative routes, including connections through Chicago O’Hare International Airport before continuing to Newark.
The Feb. 15 ferry flight was likely intended to reposition the aircraft back to the airline’s U.S. maintenance network for additional work or to return it to operational service. The diversion to Dublin, however, resulted in further delay and inspection requirements.
Aging widebody aircraft remain critical to operations
The aircraft involved in the incident, registered as N657UA, is approximately 33 years old, making it one of the older widebody jets still operating in United Airlines’ fleet.
While older aircraft remain safe to operate under stringent regulatory oversight and airline maintenance programs, they typically require more frequent inspections and component servicing, particularly for long-haul international routes where system redundancy is essential.
The Boeing 767 continues to serve as an important part of United’s long-haul and cargo operations, despite the airline gradually introducing newer aircraft models to modernize its fleet.
For now, the aircraft remains grounded in Dublin as technical teams complete inspections and determine when it can safely return to service. The airline has not disclosed a timeline for the aircraft’s return.
