On 19 January 2011, an air refuelling accident occurred between a boom equipped A330 MRTT and a Portuguese Air Force F-16 over the Atlantic Ocean off the coast of Spain.

Early reports indicate that the boom broke off at the aft end of the boom near the F-16's receptacle which caused the boom to recoil into the underside of the A330 MRTT. The boom then became uncontrollable and oscillated until it broke off the boom assembly at the pivot point.

Both aircraft were damaged, but landed safely.

The A330 MRTT involved was an Airbus test aircraft destined for the RAAF; the air arm issued a statement that the aircraft was operated by an Airbus crew with no Australian personnel on board. At the time of the incident, Airbus had not begun deliveries.

On the 10th September 2012, an A330 MRTT's refuelling boom became detached in flight at an altitude of 27,000 ft in Spanish airspace. The boom separated cleanly at a mechanical joint and fell to the ground, while the aircraft landed safely.

There were no injuries caused by the malfunction.

The incident was the result of a conflict between the backup boom hoist (fitted to the UAE-destined A330 MRTTs) and the primary boom retraction mechanism and was attributable to the testing being conducted. Airbus later explained that the malfunction was not possible under ordinary operating conditions and that procedures had been designed to avoid similar incidents in the future.

Following the incident, INTA, the Spanish regulatory authority, issued precautionary restrictions to other users of boom-equipped A330s.