What was found
DURING CLIMB AT 15000 FEET, SEVERE DAMAGE OCCURRED IN THE LT ENGINE, EMERGENCY PROCEDURE WERE PERFORMED. LT ENGINE WAS CHANGED IAW AMM 71-00-00 PAGE 401. TEST WITH ENGINE RUN UP WERE PERFORMED IAW AMM 71-00-00 PAGE BLOCK 501 WITH SATISFACTORY RESULTS. BOROSCOPE WAS PERFORMED WITH THE FOLLOWING RESULTS: T1 BLADES: NORMAL, T2 BLADES: SOME MINOR DAMAGES, T3 / T4 BLADES: MISSING, PRELIMINARY CONCLUSION : T3 / T4 BLADE FAILURE.