According to the Spanish Civil Aviation Accident and Incident Investigation Commission, "once it was in contact with the approach to Santiago [de Compostela] the crew called 'mayday' due to a fuel emergency, as the fuel management estimate showed they were going to land with less than the 989 kilos stipulated as a final reserve in the operational flight plan."

A spokesperson for TAP gave assurances to Lusa that, on the flight on 10 Octoebr, “all protocols were followed,” and that “at no time was the safety of the operation at risk.”

"The actions of the TAP pilots were exemplary and at no time was the security of the operation at risk,” TAP said, noting that “the flight was carrying more than the minimum fuel required according to current international regulations.”

The TAP spokesperson said “the statement of fuel emergency was made due to a legal requirement,” as it is “obligatory whenever any flight is expected to land with fuel below 30 minutes of flight,” and that the aircraft landed with enough fuel to fly for another 29 minutes.

The Airbus A-319 aircraft landed with no problems on runway 35 of Santiago airport, “with 962 kilos of fuel,” said the Spanish agency investigating the event.

Contacted by Lusa, a spokesperson for the Spanish agency said the investigation began on 10 October and declined to give further details until the final report is published.