What was found
DURING APU SHUTDOWN THERE WAS A LOUD BANG, APU SHUT DOWN IMMEDIATELY, LARGE CLOUD OF SMOKE SHOT OUT OF THE EXHAUST AS WELL AS LARGE PIECES OF METAL. DURING INSPECTION OF APU FOUND APU TAILCONE INNER LINER TO BE DAMAGED FROM THE EXPLOSION. FOUND 4 HOLES AND THE AFT PART OF THE INNER LINER IS WARPED OUT OF SHAPE. APU EDUCTOR LINER IS WARPED FROM APU EXPLOSION. FOUND APU ENGINE OUTLET EXHAUST BLADES DAMAGED WITH FOD BETWEEN THE ENGINE EXHAUST BLADES.