AN ACR WDB SUFFERED MULTIPLE INST FAILURES.

Narrative

AFTER TKOF FROM SFO; LOST #1 AUTO THROTTLE FOLLOWED BY #1 CENTRAL AIR DATA COMPUTER. LOST ALL INSTS CORRESPONDING TO #1 AIR DATA COMPUTER. FO FLYING. FO'S INSTS OK. CAPT SELECTED INPUT FROM OTHER AIR DATA COMPUTER FOR HIS INSTS. FO ASSIGNED TO FLY WHILE CAPT AND FE WORKED ON PROB. #1 ONS OUT; WOULD NOT COME OUT OF DR. SUBSEQUENTLY LOST #2 MACH TRIM IN ADDITION TO #1 BEING OUT AND #1 MACH FEEL ALSO OUT. DECISION MADE TO RETURN TO SFO. NOTIFIED CTR AND BEGAN RETURN TO SFO. REVIEWED FUEL DUMP PROCS/TIME; AND WHEN GIVEN PERMISSION BY CTR; BEGAN FUEL DUMP. NOTIFIED COMPANY WHO THEN CALLED US BACK REQUESTING WE GO TO LAX FOR PARTS. STOPPED FUEL DUMP; ASSESSED FUEL REMAINING AND WENT TO LAX. LANDED WITHOUT INCIDENT. HAVING FLOWN MLG'S FOR MANY YRS; THIS WAS THE FIRST TIME I WAS INVOLVED IN AN ABNORMAL PROC WITH A 3 PERSON CREW. I STRONGLY FEEL THE 3 PERSON CREW WORKS EXTREMELY WELL. WITH 1 PERSON ASSIGNED TO FLY WHILE THE OTHER 2 CREW MEMBERS WORKED ON THE PROB; THERE WAS NEVER ANY QUESTION OR DIVERSION. THE PLANE WAS ALWAYS UNDER CTL. THE CAPT DID AN EXCELLENT JOB OF ASSESSING THE SIT AND SUPERVISING. ALSO; HAVING 2 PEOPLE REVIEW THE CHKLIST PROVIDES FOR GREATER CHKS AND BALS; WITHOUT DIVERTING ATTN FROM THE PF.