Mistakes by the crew and the failure of a warning system caused a Spanair jet to crash at Madrid airport killing 154 people, according to an official inquiry.
The crew failed to place the airliner's flaps in the correct position when it took off from Madrid bound for Gran Canaria in August 2008, said the Spanish Civil Aviation Authority's accident report, published on Friday.
An automatic voice warning which should have alerted the crew also failed to sound, said the report.
The commission had already said in their preliminary report a year ago that the plane took off with its wing flaps and slats retracted.
Spanair Flight JK5022 - an MD-82 jet - crashed on takeoff on August 20, 2008 as it tried to leave Madrid airport.
There were just 18 survivors following what was Spain's worst aviation disaster in 25 years.
In the causes section, the report says that the airliner's crew did not detect the configuration error nor 'noted the loss-of-functionality warnings nor corrected that situation after takeoff'.
Following the report, the Spanish Civil Aviation Accident and Incidents Investigation Commission recommended modification of the Flight Manual linked to the aircraft's Type Certification to include opportune instructions relative to checking the Take-off Warning System.