A B757 CAPT REPORTED HE REGULARLY RECEIVES FALSE EGPWS TERRAIN WARNINGS FLYING INTO EGE WHEN THE AIRCRAFT IS EQUIPPED WITH THE BASIC FMC THAT IS PRONE TO MAP SHIFTS. HE RECOMMENDED HIS ACR ONLY FLY THE MORE ADVANCED FMC AIRCRAFT INTO EGE.

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CONTINUE TO RECEIVE 'TERRAIN TERRAIN' AND 'TERRAIN TERRAIN PULL UP' ON FINAL TO RWY 25 DUE TO MAP SHIFT ON B757 BASIC FMC ACFT. PLTS AND CHK AIRMEN STATE THAT THE COMPANY IS AWARE OF THE PROB BUT UNABLE TO FIX IT. I AM NOT SURE BUT HAVE BEEN TOLD THIS PROB DOES NOT OCCUR ON OTHER FMC EQUIPPED B757'S. CHK AIRMEN BRIEF THAT THIS MAY/CAN OCCUR ON FINAL DUE TO MAP SHIFT. ALSO BRIEF ABOUT TURNING OFF THE GPWS SWITCH TO SILENCE THE VERY LOUD ALERT THAT CAN BE HEARD BY FLT ATTENDANTS AND FIRST CLASS PAX. PROB IS THIS OCCURS AT NIGHT AND LESS THAN CLR (IE; SNOWSTORM). B767 QRH MANEUVERS MANUAL SAYS THAT COMPLIANCE WITH ESCAPE MANEUVER IS REQUIRED (MUST BE DAYLIGHT CLR VMC CONDITIONS) EVEN THOUGH THE RWY IS CLRLY VISIBLE AND THE OFFENDING TERRAIN IS OFF TO THE L OF CTRLINE. I DONT' WANT CAPTS GETTING VIOLATED FOR A PROC THAT CHK AIRMEN ARE SAYING IS OK BECAUSE THE COMPANY KNOWS ABOUT IT. ALSO DON'T WANT TO GET CALLED INTO THE CHIEF PLT'S OFFICE BECAUSE A DFDR GPWS EVENT. SOLUTION IS TO ONLY FLY OTHER FMC ACFT INTO EGE.