HS25 CREW HAD ELECTRICAL FAILURE ON CLBOUT FROM DTW.

Narrative

DURING APCH INTO WHITE PLAINS; NY; THE #1 GENERATOR TRIPPED; CREW LANDED AT DEST AND REINSTATED GENERATOR ON THE GND; THEN DEPARTED AND FLEW TO DETROIT METRO UNEVENTFUL; THEN DEPARTED DTW AND LOST #1 GENERATOR; AUTOPLT; YAW DAMPER; AIR DATA COMPUTER #2; ALL COPLT'S FLT INSTS AND PLT SIDE HEADING INSTS; ALSO EXPERIENCED FMS AND RADAR FAILURES WITH AUDIO WARNINGS OF ELECTRICAL BUS FAILURES; CREW REQUESTED TO DIVERT BACK TO HOME BASE (NEARBY PONTIAC ARPT). WITH IMC AND FURTHER FAILURES; CREW DECLARED AN EMER AND TOOK VECTORS TO PONTIAC. WE BROKE OUT OF IMC AT 8000 FT WITH PONTIAC ARPT IN SIGHT AND STRAIGHT AHEAD. WE CONTINUED TO PONTIAC AND LANDED UNEVENTFULLY WITH CONTINUOUS AUDIO AND MASTER WARNING FLASHERS. AFTER LNDG; WE SHUT THE ACFT DOWN AT OUR BASE AND COORDINATED WITH COMPANY MAINT AND OPS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: ACFT HAD JUST DEPARTED DTW. THE #1 GENERATOR TRIPPED FOR THE SECOND TIME. THIS TIME THE BUS TIE RELAY FAILED TO OPEN. THE CREW FOLLOWED THE EMER CHKLIST BUT WAS UNABLE TO OPEN THE BUS TIE MANUALLY. THIS CAUSED THE #1 GENERATOR TO DRAG DOWN THE ENTIRE ACFT ELECTRICAL SYS. THIS THEN CAUSED ALL THE REMAINING ELECTRICAL PROBS. COMPANY MAINT REPLACED THE #1 GENERATOR; THE GENERATOR CTL PANEL; THE BUS TIE CTL PANEL; AND THE BUS TIE RELAY. EXTENSIVE MAINT INSPECTION WAS PERFORMED ON THE REMAINING ELECTRICAL RELAYS TO INSURE THAT THEY WERE SERVICEABLE. THE COMPANY OPERATES FIVE OF THESE ACFT AND THIS IS THE FIRST TIME A PROB OF THIS NATURE HAS SURFACED.