What was found
AIRCRAFT DEPARTED FOR RETURN TRIP HOME. APPROXIMATELY 80 MILES FROM DEPARTURE POINT, THE ENGINE STARTED HAVING COMPRESSOR STALLS AND FLAMES COULD BE SEEN IN THE EXHAUST STACKS. ENGINE WAS SHUT DOWN AND PROPELLER FEATHERED. PRELIMINARY INVESTIGATION BY FIELD SERVICE REP, SUGGESTED THE PROBABLE CAUSE TO BE ICE INGESTION. THE IMPELLER HAD 25 PERCENT OF ONE BLADE MISSING AND SOME OTHER BLADES WERE ROLLED OVER IN THE DIRECTION OF ROTATION. THE PILOT REPORTED THAT UPON DEPARTURE AND PASSING THROUGH 10,000 FEET HE PUT FULL ICE PROTECTION.