A B757-200 IN CRUISE AT FL370 DIVERTED DUE TO NUMEROUS AIR DATA COMPUTER SERVED SYS FAILURES.

Narrative

AFTER CLBING OUT OF FL330 TO FL370 THE ALT ALERT DID NOT FUNCTION PROPERLY; THEN FOLLOWED WITH THE L AUTOPLT MOVING THE YOKE FORWARD AND AFT 2-3 INCHES 4 TIMES IN LESS THAN 2 SECONDS; FOLLOWED BY THE CABIN ALT INSTS SPINNING LIKE A PROP IN BOTH AUTO 1 AND 2 MODES; FOLLOWED BY THE NO LAND 3 STATUS; FOLLOWED BY THE AUTOTHROTTLES DISCONNECT AND EICAS MESSAGE SEVERAL TIMES; FOLLOWED BY THE R AUTOPLT TRIPPING OFF. THIS WAS ALL OVER A 15 MIN PERIOD. A PATCH WITH DISPATCH AND MAINT WAS MADE AND AFTER 30 MINS; A DECISION WAS MADE TO WHICH ARPT TO DIVERT TO FOR MAINT. WE DSNDED TO FL240 DUE TO THE CABIN ALT PROB; NOT KNOWING WHERE IT WAS DUE TO SPINNING DIALS. WE LANDED SAFELY IN SFO AND PLACED ALL ITEMS IN THE LOG. SFO WAS PICKED FROM DISPATCH AND MAINT FOR MAINT REASONS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B757-200 AND WAS DELAYED FOR 2 HRS AWAITING AN AIR DATA COMPUTER SHIPPED INTO THE DEP STATION TO CORRECT A PREVIOUS LOG WRITE-UP. THE RPTR SAID THE MECH REPLACED THE AIR DATA COMPUTER AND ACCOMPLISHED A BITE TEST OF THE COMPUTER AND SIGNED OFF THE RPT. THE RPTR STATED THE MECH DID NOT PERFORM A STATIC LEAK CHK WHICH THE RPTR THOUGHT WAS NECESSARY. THE RPTR STATED THE ACFT HAD THE CTR AUTOPLT DEFERRED AS INOP BUT NOT PLACARDED AND THE CIRCUIT BREAKERS WERE NOT PULLED AND LOCKED OUT. THE RPTR SAID ON CLBING FROM FL330 IT WAS NOTED THE ALT ALERT SYS WAS NOT WORKING AND ON LEVELOFF AT FL370 THINGS BEGAN TO HAPPEN LIKE THE YOKE MOVING FORE AND AFT; CABIN PRESSURE AND ALTIMETER FLAGS IN VIEW; CABIN PRESSURE INDICATORS PEGGED AND THE CABIN ALT DIFFERENTIAL PRESSURE INDICATOR SPINNING LIKE A PROP AND THE AUTOTHROTTLE DISCONNECTED. THE RPTR SAID A DSCNT WAS MADE TO FL240 DUE TO CONCERN ABOUT THE PRESSURIZATION BUT AT NO TIME DID THE ACFT LOSE PRESSURIZATION. AFTER THE ACFT WAS LANDED AND MAINT MADE A QUICK CHK OF THE L AIR DATA COMPUTER; IT INDICATED 12 FAULTS BUT NO OTHER DETAILS WERE RECEIVED FROM MAINT.