B767 FLT CREW REPORTS ELECTRICAL MALFUNCTIONS ENROUTE IN FOREIGN AIRSPACE AFTER BEING DISPATCHED WITH APU GEN INOP. RIGHT AC BUS REMAINS ISOLATED AFTER COMPLYING WITH QRH PROCEDURES AND FLT CREW ELECTS TO DECLARE AN EMERGENCY AND DIVERT.

Narrative

SCHEDULED TO FLY WITH AN APU GENERATOR INOP. PROBS WITH THE L GENERATOR CYCLING ON AND OFF DURING ENG START AND WHEN PULLING EXTERNAL PWR. ZZZZ MAINT COME ON BOARD; WE RESTARTED L MOTOR; ACFT X MECH CYCLED ELECTRIC PWR MANY TIMES BTWN EXTERNAL/GENERATOR #1/GENERATOR #2. ZZZZ MAINT; MYSELF; FO'S; MAINT AND DISPATCH ALL WERE CONVINCED THAT ALL WAS OK. RECEIVED NEW RELEASE; ADDED FUEL AND DEPARTED. ABOUT 3 HRS INTO FLT; R GENERATOR DROPPED OFF LINE. MANY EICAS MESSAGES. R GENERATOR; R BUS TIE ISOLATED. R ENG EEC OFF. DECLARED EMER; RECALLED FO TO COCKPIT. DIVERT TO ZZZZ. WE CHOSE ZZZZ OVER ZZZZ2 BECAUSE OF A LONGER RWY; LISTED AS PRIMARY DIVERSION ARPT IN FOM; NOTE IN FOM FOR ZZZZ2 DEEP DITCHES LOCATED AT BOTH ENDS OF RWY AND TALKING TO ACR Y WHO INFORMED US HE WAS OVER ZZZZ AND THE WX WAS PERFECT. ALSO THE FO HAD BEEN IN ZZZZ BEFORE. WE HAD SOME PROBS UNDERSTANDING ATC. USING MY EMER AUTH I INVITED A CURRENT ACR Z CAPT INTO THE COCKPIT TO HELP WITH COM AND HIS KNOWLEDGE OF ZZZZ. WE WERE UNABLE TO COMMUNICATE WITH OUR DISPATCH ON ACARS/HF/SATCOM. ACR Y ASSISTED BY HAVING HIS DISPATCH CONTACT OUR DISPATCH. ACR Y ALSO ADVISED US THEY WERE HAVING TROUBLE CALLING COMPANY DUE TO A PROB WITH ACR Y COM IN USA. ACR Y ALSO ASSISTED IN ATC COM AND WX INFO. DIVERT UNDERWAY; ACCOMPLISHED ALL CHKLISTS. DIVERSION CHKLIST; GENERATOR FAIL CHKLIST. R GENERATOR RESET SUCCESSFULLY. WE DID NOT ATTEMPT BUS TIE RESET BECAUSE WE WERE SATISFIED WITH EQUIP WE HAD AND DID NOT WANT TO TROUBLESHOOT FURTHER. MADE VMC APCH; OVERWT LNDG AT ZZZZ.