A DC10 LEAVES NORTH ATLANTIC TRACK U AND ALT WHEN #3 ENG SUFFERS A COMPRESSOR STALL AND IS SHUT DOWN.

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WHILE FLYING ON NAT TRACK U; #3 ENG COMPRESSOR STALLED AT FL330. IT WAS POSSIBLY CAUSED FROM TURB ENCOUNTERED. WE WERE IN LIGHT TURB AND GOT A COUPLE GOOD JOLTS AND THEN IT STALLED. THE FO BEGAN DSCNT OUT OF FL330 AND TURNED 90 DEGS N AWAY FROM THE TRACK. CAPT (PNF) AND SO COMPLETED THE ENG FAILURE CHKLIST WHILE FO (PF) BROADCAST MAYDAY ON GANDER OCEANIC. SO AND I SAW NOTHING OBVIOUS WRONG WITH THE ENG AND ATTEMPTED A RESTART. FO (PF) TURNED PARALLEL TO THE TRACK 25 MI OFFSET AND LEVELED AT FL280. SO BROADCAST ON VHF POS. AFTER ENG RESTARTED; WE CALLED GANDER AND WERE RECLRED ON TRACK U AT FL290. WE CALLED DISPATCH ON HF PHONE PATCH THROUGH STOCKHOLM RADIO AND GOT CONFIRMATION TO CONTINUE TO FRANKFURT. HF PHONE PATCH WAS POOR. MAINT WAS ALSO NOTIFIED. SUPPLEMENTAL INFO FROM ACN 404549: ENG #3 COMPRESSOR STALLED AND WAS SHUT DOWN. PF (FO) BROADCAST MAYDAY ON GANDER OCEANIC HF FREQ. ONLY REAL PROB WAS HORRIBLE COMS WITH GANDER OCEANIC ON HF RADIO; AS DAWN WAS APCHING. COMS WERE 2 BY 2 ON HF; AND MESSAGES HAD TO BE REPEATED SEVERAL TIMES. I PASSED SEVERAL BROADCASTS ON VHF TO LET OTHER ACFT ON NAT TRACKS KNOW OUR SIT; POS; AND WHERE TURB WAS ENCOUNTERED.