What was found
(CAN) IN CRUISE AT FL370 WHEN CREW APPLIED CLIMB POWER TO ASCEND TO FL390- HIGH SPEED SPOOL (N2) OF- NR2 ENGINE SUDDENLY DROPPED FROM CLIMB SPEED TO ZERO RPM. FOLLOWED BY HIGH VIBRATIONS. CREW FOLLOWED ENGINE SHUTDOWN PROCEDURES &- A/C WAS DIVERTED. STAGE 2 TURBINE BLADE FAILURE WAS SUSPECTED &- ENGINE WAS REPLD. AFTER ENGINE DISASSY,- STAGE 2 BLADE FRACTURE WAS CONFIRMED. THIS TYPEOF FAILURE, CAUSED BY ATMOSPHERIC DIRT & COMBUSTION BY-PRODUCTS ATTACKING- BLADE MATERIAL, IS AN INDUSTRY PROBLEM ON- PW4000-94/100 PHASE 3 ENGINES.- AIRLINE SUBMITTING THIS RPT STATES THAT-Y HAVE HAD TWELVE OTHER ENGINE SIMILARLY AFFECTED & ALL SUSPECTED ENGINES IN- FLEET WERE REPLD & MODIFIED TO ELIMINATE- PROBLEM.