A B757-200 WAS DISPATCHED OVERWATER IN NON COMPLIANCE WITH TWO FAN DUCT EXIT GUIDE VANES DEFERRED MISSING. PRE-FLT INSPECTION FOUND ONE VANE BOWED; FIVE VANES MISSING AND FOUR INTACT. ENG WAS REPLACED.

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I'M WRITING REGARDING A FLT FROM ZZZ TO ZZZ1 ON AUG/MON/2004. THE HISTORY IS AS FOLLOWS: THE ACFT ARRIVED ZZZ AS FLT XYZ FROM ZZZ2 AT XA:55. THIS ACFT HAD A DEFERRAL REGARDING THE R ENG. SPECIFICALLY; TWO MISSING EXIT GUIDE VANES AND ONE EXIT GUIDE VANE BOWED. A COCKPIT REVIEW OF THE AIRPLANE LOGBOOK REFLECTED A PROPER RELEASE; INCLUDING THE EXTENDED RANGE TWIN ENG OVERWATER OPS SVC CHECK COMPLETE. DURING THE FO'S EXTERIOR PREFLT; HE FOUND 3 MORE GUIDE VANES MISSING AND ONE PIECE OF A BROKEN BLADE IN THE R ENG. IN ADDITION; HE FOUND THE R ENG OIL SVC DOOR OPEN. THE FINAL PATTERN OF MISSING AND INTACT EXIT GUIDE VANES RESULTED IN ONE BOWED WITH TWO ADJACENT MISSING; FOUR INTACT; THREE ADJACENT MISSING. THIS WAS DETERMINED TO BE OUT OF LIMITS AND THE AIRPLANE WAS TAKEN OUT OF SVC. MY SAFETY CONCERNS ARE: 1. THIS AIRPLANE WAS RELEASED EXTENDED RANGE TWIN ENG OVER WATER OPS IMPROPERLY WITH DEFECTS. 2. USE OF THIS ACFT ON EXTENDED RANGE TWIN ENG OVERWATER OPS FLT SEGMENTS WITH MISSING EXIT GUIDE VANES. 3. MEL REQUIREMENTS? IT SHOULD BE REQUIRED THAT THE ENG BE INSPECTED BEFORE AND AFTER EACH FLT SEGMENT. 4. PAX SAFETY CONCERNS AFTER THE CANCELLATION OF THIS FLT WHICH WILL BE ADDRESSED IN A SEPARATE EMAIL TO PLT ORGANIZATION AND THE ACR OFFICE. IN CLOSING; IT SHOULD BE NOTED THAT THIS ENG PROBLEM WENT UNNOTICED FROM THE ACFT'S ARR AT XA:55 UNTIL OUR PREFLT AT APPROX XI:00; SOME 7 HOURS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THIS MAINT PROB WAS COMPOUNDED BY THE DISCOVERY OF THE ADDITIONAL DAMAGE TO THE GUIDE VANES SEVEN HOURS AFTER ARR ON THE PREFLT CHECK. THE RPTR STATED THE ARR STATION WAS NOT A MAINT STATION; BUT DID HAVE CONTRACT TECHNICIANS ON CALL. THE RPTR SAID THE AIRPLANE WAS MAINTENANCE FERRIED TO A MAINT STATION WHERE THE ENG WAS REPLACED DUE TO THE VANE DAMAGE BEING OUT OF LIMITS.