FLC ERRONEOUSLY ENTERED RVSM AIRSPACE WITHOUT THE PROPER MINIMUM REQUIRED FLT INSTS DUE TO EQUIP FAILURE.

Narrative

10 MINS BEFORE ENTERING NAT FOR AN OCEAN XING IN REDUCED VERT SEPARATION MINIMUM AIRSPACE; A COMPUTER FAILURE ON BOARD THE ACFT CAUSED US TO LOSE BOTH ENG ELECTRONIC CTLS AND THE FO'S PITOT STATIC INSTS. FOLLOWING THE PROCS IN THE ACFT MANUAL WE TRIED TO RESTORE THE ENG ELECTRONIC CTLS TO NO AVAIL. WE TRIED TO RESTORE THE FO'S ALTIMETER AND AIRSPD INDICATOR BY GOING TO THE 'ALTN' POS ON THE AIR DATA SWITCH. THIS WAS SUCCESSFUL. WE THEN CALLED THE COMPANY MAINT COORDINATOR TO INFORM HIM OF THE PROB -- AND AS TO WHETHER WE COULD ENTER RVSM AIRSPACE. HE STATED THAT IT WAS 'OK' BECAUSE WE HAD 2 ALTIMETERS -- CAPT'S AND STANDBY. WE LATER FOUND THIS TO BE INCORRECT -- 2 PRIMARY ALTIMETERS ARE NEEDED FOR RVSM ENTRY. LESSONS LEARNED: 1) DON'T ALWAYS BELIEVE WHAT MAINT MAY TELL YOU. 2) WE RESTORED THE FO'S INSTS BY SIMPLY PUSHING THE 'ALTN' AIR DATA SWITCH -- NOT BY GOING TO THE ABNORMAL CHKLIST WHICH CLRLY WARNS ABOUT RVSM ENTRY. WE WERE RUSHED. WHAT WE HAD LOOKED GOOD -- THEY SAID SO -- SO WE WENT.