What was found
DURING DESCENT AT ABOUT 24000 FT, CREW EXPERIENCED AN AC BUSS 2 FAILURE, WITH A BRIEF ELECTRICAL ODOR NOTED & A LOSS OF PRESSURIZATION. CREW RAN AC BUSS 2 MESSAGE CHECKLIST & SUCCESSFULLY RECOVERED NORMAL ELECTRICAL OPS. APPROX 30 SECONDS LATER A MORE SERIOUS ELECTRICAL FAILURE OCCURRED. ADG DEPLOYED & BOTH AC BUSSES 1 & 2 FAILED BUT CAME BACK ONLINE. BOTH AC AUTO TRANSFER FUNCTIONS SHOWED THAT THEY HAD FAILED. UNABLE TO RECOVER ALL OF AC BUSSES EXCEPT FOR AC SERVICE BUSS. AN EMERGENCY DECLARED & ACFT LANDED SAFELY IN ATL. MX R & R A/C TRANSFER CONTRACTOR & ASSOCIATED WIRING IAW ASA EO 600-24-0040. MX ALSO R & R BATTERY PACK FOR PREVENTATIVE MX. OPS CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)