AN ACR LTT PLT RPTED HIGH ENG OIL USAGE TO HIS MAINT DEPT TO NO AVAIL.

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ON OCT/TUE/93; I NOTICED THE AIRPLANE I WAS ASSIGNED TO FLY APPEARED TO BE USING A LOT OF OIL PER FLT HR. SO I CALLED ACR AIRLINES MAINT BASE AND TALKED TO X; THE MAINT IA. HE SAID IT WAS OK. I ALSO CALLED Y; THE ACR IA AND HIS BOSS. HE; TOO; SAID IT WAS OK. I FLEW IT THAT DAY AND THE NEXT. THE AFTERNOON OF OCT/WED/93; IT BURNED A LOT OF OIL; SO I CALLED THE ENG MANUFACTURER. THEY SAID IT WAS BURNING TOO MUCH OIL AND WAS NOT AIRWORTHY. BOTH X AND Y HAD TOLD ME THERE WERE NO LIMITS IN THE ENG MANUFACTURER'S MANUALS. EITHER THEY LIED; OR THEY DON'T KNOW ENOUGH TO BE IA'S. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: THE RPTR WAS WORKING FOR A SMALL COMMUTER AIRLINE. HE IS NOW ON 'INDEFINITE SUSPENSION FOR COMPLAINING TOO MUCH' ABOUT THIS SIT. THE ACFT IN QUESTION WAS BURNING MORE THAN THE 1 QUART/10 HRS MAX ALLOWED BOTH IN THE ENG MANUAL AND THE ACFT MANUAL PUT OUT BY THE MANUFACTURERS. THE ACFT WAS ON LOAN FROM ITS MANUFACTURER. IT WAS RETURNED TO THE MANUFACTURER WITHOUT FIXING THE HIGH OIL CONSUMPTION PROB.