What was found
LOUD THUMP HEARD AFTER T/O. ALL ENG IND`S NORMAL THROUGH CLIMB-OUT TO 10,000 FT. PASSING 10,000 FT SEVERAL SUCCESSIVE THUMPS WITH NO ABNORMAL ENG IND`S. A/C RETURNED WITH NORMAL LANDING. ENG SHUTDOWN AFTER LANDING. L-1 AND L-2 DOOR SLIDES DEPLOYED & PAX`S EVACUATED AS PRECAUTION DUE TO REPORTS OF POSSIBLE SMOKE ON NR 2 ENG. BOTH FIRE BOTTLES BLOWN. INITIAL EXAM OF NR 2 ENG FOUND NO EVIDENCE OF FIRE DAMAGE OR UNCONTAINED FAILURE. NR 2 ENG R & R. OPS CHKS GOOD. IN ADDITION, L-1 AND L-2 DOOR SLIDES AND FIRE BOTTLES REPLACED. VSV STAGE ONE ROTATED OUT OF TIMING(NUT BACKED OFF) RESULTING IN VSV FRACTURE. OUT OF TIME VSV INDUCED HPC FAILURE.