AN ACR B767-300 CREW HAD AN INFLT ENG FIRE. EMER DECLARED. DIVERSION TO ALTERNATE. RETURN LAND. NIGHT OP.

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IT SEEMS TO ME THAT THE MECH USED A NON STANDARD PROC FOR DISCONNECTING THE IDG. THE PROC WHICH HE USED APPARENTLY WAS UNSUCCESSFUL. IT SEEMS TO ME THAT WHEN THE IDG DRIVE LIGHT COMES ON; IT MIGHT AS WELL GO AHEAD AND DISCONNECT ITS IDG AUTOMATICALLY; SINCE THE PROC GIVES NO ALTERNATIVE BUT TO DISCONNECT IT ANYWAY. APPARENTLY; IF THE IDG DRIVE LIGHT COMES ON; YOU HAVE A VERY GOOD CHANCE OF AN ENG FIRE. I WOULD MUCH PREFER TO LOSE A GENERATOR THAN AN ENG. SHORTLY AFTER CLRING RAMP AND TURNING ONTO TXWY; 'R GENERATOR OFF' AND 'R GENERATOR DRIVE' EICAS MESSAGES APPEARED. ASKED GND CTL FOR RETURN TO GATE. CALLED MAINT AND TOLD THEM WE WERE RETURNING TO GATE WITH ABOVE EICAS MESSAGES. COMPLETED AFTER LNDG CHKLIST AND 'GENERATOR OFF' ABNORMAL PROC; STARTING APU. COMPLETED SHUTDOWN CHKLIST AND WROTE UP DISCREPANCY IN ACFT LOGBOOK. MECH TOOK ACFT LOGBOOK AND MEL WITH HIM AND LEFT TO PERFORM MAINT. MECH RE-ENTERED COCKPIT WITH COMPLETED LOGBOOK; RETURNED MEL; AND AFFIXED A YELLOW MCO PLACARD TO OVERHEAD ELECTRICAL PANEL. DISCUSSED WITH MECH WHAT ACTION HAD BEEN TAKEN; REVIEWED REPETITIVE CHK REQUIREMENT OF APU OIL LEVEL; AND WERE ASSURED BY MECH IDG HAD BEEN DISCONNECTED. REVIEWED MEL AND RECEIVED NEW DISPATCH PAPERWORK FROM AGENT. MECH GAVE PREARRANGED SIGNAL FROM RAMP THAT APU OIL LEVEL WAS ADEQUATE. CONDUCTED NORMAL PUSH BACK; TKOF AND INITIAL CLBOUT COMPLETING ALL CHKLISTS. AT APPROX 25000 FT AND 80 NM ALONG RTE TO PDX; AN 'R STARTER CUTOUT' EICAS MESSAGE AND OVERHEAD R STARTER VALVE LIGHT CAME ON INTERMITTENTLY. ACCOMPLISHED 'STARTER CUTOUT' ABNORMAL PROC WITH MESSAGE AND LIGHT STILL ILLUMINATED; ALL OTHER ENG INDICATIONS NORMAL. A FLT ATTENDANT ENTERED COCKPIT AND INFORMED US THAT A PAX ON R OF ACFT BEHIND WING WAS SEEING FIRE COMING OUT OF R ENG. FO WENT BACK TO CHK AND SAW LARGE SPARKS COMING FROM TAILPIPE OF R ENG. RETURNED TO COCKPIT AND INFORMED CAPT AND RECOMMENDED RETURN TO SLC ASAP. WHILE FO WAS REQUESTING RETURN TO SLC; R ENG FIRE WARNING OCCURRED. ACCOMPLISHED ENG FIRE PROC INCLUDING FIRING BOTH BOTTLES AND DECLARED EMER WITH ATC INFORMING THEM OF OUR PROB. THE FIRE WARNING EXTINGUISHED SHORTLY AFTER SECOND BOTTLE WAS DISCHARGED. REQUESTED FROM ATC THAT ALL AVAILABLE EQUIP BE STANDING BY FOR OUR ARR. BRIEFED FLT ATTENDANTS OF SIT AND THAT THEY SHOULD BE PREPARED FOR A POSSIBLE EVAC. COMPLETED SINGLE ENG LNDG AND ROLLOUT ON SLC RWY 16L STOPPING ACFT ON RWY. TOLD PAX TO STAY IN SEATS AND THAT FIRE DEPT WAS DEALING WITH ENG FIRE. ESTABLISHED CONTACT WITH 'FIRE CTL.' FIRE CTL INFORMED US THAT THE FIRE APPEARED TO BE MANAGEABLE. AFTER DISCUSSION WITH FIRE CTL AND WITH HIS RECOMMENDATIONS; IT WAS DECIDED NOT TO EVAC. AFTER FIRE CTL CONFIRMED FIRE WAS EXTINGUISHED; ACFT WAS TAXIED TO GATE WITH FIRE ESCORT. PARAMEDICS WERE MADE AVAILABLE AT THE GATE IF NEEDED. ACFT LOG ENTRY WAS MADE AND INFLT ENG SHUTDOWN FORM COMPLETED.