At 4pm it squawked the emergency code 7700.
Tracking data end at 4.30 pm, with the aircraft appearing at 625 ft just above Lakenheath.
A Twitter account tracking air traffic claimed that during the flight, the aircraft had to shut down one engine.
Declaring an emergency during a flight means the crew determines they have an ‘urgency’ or ‘distress’ situation.
Explaining the emergency codes in aviation, pilot Ken Hoke said the crew requests “timely (but not necessarily immediate) assistance”.