Airbuses, rain, short runways, poor training and budget maintenance

During the flare at thrust reduction, select all thrust levers to IDLE

To sum up, when approaching at 20 ft radio altitude, only thrust lever 1 was pulled back and the "Retard" warnings was neglected as thrust lever 2 was not pulled back to "Idle" position. The aircraft's landing speed was not decreased efficiently as a result of inactivation of ground spoilers and auto braking system after touchdown. Meanwhile, because the thrust output of engine 2 was remained at EPR 1.08 and the wet runway became slippery, the aircraft was not able to achieve substantial speed reducing on the residual runway and overrun the runway though the maximum manual braking was applied.
From: http://www.asc.gov.tw/acd_files/189-c1contupload.pdf

It is impressive how the Report on the Runway Overrun During Landing On Taipei Sungshan Airport TRANSASIA AIRWAYS FLIGHT 536 fits well A 320 TAM flight 3045 tragedy.