What was found
(CAN) DURING DESCENT FROM 15,000 FT, THE CREW REDUCED POWER & THE LT ENG BEGAN TO SURGE. POWER WAS FURTHER REDUCED TO IDLE & ENG CONTINUED TO SURGE. THE CREW ELECTED TO PERFORM A PRECAUTIONARY SHUTDOWN & ACTIVATE THEIR EMER PROCEDURES. THE ACFT LANDED UNEVENTFULLY. POST FLIGHT INSPECTION CONFIRMED 2ND STAGE PT BLADES FRACTURED AROUND MID-SPAN. ENG REMOVED & SHIPPED FOR REPAIR. MFG WILL INVESTIGATE TO ESTABLISH ROOT CAUSE & PROVIDE INFORMATION TO TRANSPORT CANADA THROUGH SUBSEQUENT SERVICE DIFFICULTY REVIEW MEETING & SUPPORTING DOCUMENTS OR OTHER AGREED UPON COMMUNICATIONS.