AN ACR FLC HAS THEIR B747-200 SUDDENLY PITCH UP AND ROLL TO THE R WHEN THE #1 INS MALFUNCTIONS. 1 CABIN ATTENDANT WAS INJURED AND THE FLT WAS DIVERTED TO ANC FOR MEDICAL TREATMENT.

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LEVEL FLT AT FL310 ON #1 AUTOPLT COUPLED TO #1 INS. SMOOTH WX. #1 INS SENT A SPURIOUS SIGNAL TO THE AUTOPLT CAUSING THE ACFT TO PITCH UP VIOLENTLY; THEN ROLL TO THE R. ACFT WAS RECOVERED AT FL318. 1 FLT ATTENDANT WAS INJURED AND A DIVERSION WAS REQUIRED FOR MEDICAL HELP. 90000 LBS OF FUEL WAS DUMPED. VANCOUVER ARTCC WAS ADVISED OF ALT EXCURSION OF 800 FT AND THE REASON WHY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS FLYING A B747-200 THAT WAS EQUIPPED WITH DELCO CAROUSEL INS UNITS. THE CAPT SAID THAT THE #1 INS MALFUNCTIONED AND CAUSED THE ACFT TO PITCH UP VIOLENTLY AND ROLL SHARPLY TO THE R. THE CAPT ALSO SAID THAT WHEN HE LOOKED AT HIS INSTS AS AN AID DURING THE RECOVERY HE SAW THAT THEY HAD FAILED. ALSO; THE CAPT'S ADI ATTITUDE INDICATION SHOWED A ROLL THAT WAS EXACTLY OPPOSITE THE ACTUAL ROLL POS. THE FO'S INSTS WERE ACCURATE AND HE MADE THE RECOVERY. THE ACFT HAD CLBED 800 FT; TURNED AWAY FROM ITS COURSE DURING THE INS MALFUNCTION; BUT THE RETURN WAS QUICK AND SMOOTH ACCORDING TO THE RPTR AND THE DEV WAS NOT NOTED BY THE CTLR. A CABIN ATTENDANT IN THE AFT SECTION OF THE MAIN CABIN WAS INJURED WHEN SHE STRUCK THE CEILING AND THEN PART OF THE GALLEY WITH HER BACK. SHE HAS NOW RECOVERED. THERE WERE NO OTHER INJURIES. THE #1 INS SHOWED 11 FAULT CODES ON THE DELCO CAROUSEL INS AFTER THE EVENT. THE RPTR SAID THAT HE HAD HAD NO FEEDBACK FROM MAINT TECHNICIANS YET. HE HAD TALKED TO THE FLT DEPT SAFETY PERSONNEL AND THEY WERE GOING TO PUBLISH THE RESULTS OF THEIR FINDINGS WHEN THE CAUSE WAS FOUND.