A B767-400 IN CRUISE FL330 EXPERIENCED LOSS OF CAPT'S; FO'S AND CTR ELECTRONIC NAV AND ENG INST DISPLAYS DUE TO A KNOWN SOFTWARE FAULT.

Narrative

DURING CRUISE FLT; EXPERIENCED FAILURE OF 4 OUT OF 6 INST DISPLAY SCREENS. ALL 4 INBOARD SCREENS FAILED SIMULTANEOUSLY INCLUDING UPPER AND LOWER EICAS DISPLAYS AND CAPT AND FO NAV DISPLAYS. AN ELECTRONIC FLC BULLETIN HAD BEEN ISSUED ON THE DAY BEFORE WHICH WAS VIEWED AND A COPY PRINTED AND RETAINED BY CREW. THIS BULLETIN WAS ISSUED AS A RESULT OF INCIDENTS EXPERIENCED AT ANOTHER CARRIER ON THIS TYPE ACFT. IT CONTAINED PROCS AND GUIDANCE TO CORRECT THE PROB. COMPANY FLT CTL AND MAINT WAS CONTACTED AND IN CONCERT GUIDELINES FOLLOWED TO RESTORE DISPLAYS. PROCS INVOLVED REMOVING PWR TO ONE 'DISPLAY PROCESSING COMPUTER' AT A TIME BY PULLING THE APPROPRIATE CIRCUIT BREAKER. THERE ARE 3 DISPLAY PROCESSING COMPUTERS: L; CTR; R. UNPWRING THE R DISPLAY PROCESSING COMPUTER FIRST WAS NO HELP; THEREFORE; REPWRED. UPON REPWRING THE CTR DISPLAY PROCESSING COMPUTER; ALL 4 INOP DISPLAYS WERE RESTORED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B768-400 WHICH HAD THE ELECTRONIC INSTS FOR NAV AND ENG DISPLAYS THAT CONFORM TO THE B777. THE RPTR SAID AFTER THE INCIDENT A CONFERENCE CALL WAS MADE TO BOEING; ELECTRONIC INST MANUFACTURERS AND THE CARRIER'S ENGINEERING DEPT WHERE IT WAS REVEALED THE PROB WAS A SOFTWARE FAULT IN THE DISPLAY PROCESSING COMPUTER'S FAULT MODE.