DURING ANNUAL INSPECTION OF A HELI COURIER ACFT; THE RPTR FOUND FAA WEB SITE LISTING AIRWORTHINESS DIRECTIVES NOT AS ACCURATE AS A COMMERCIAL PROFESSIONAL UPDATED DATABASE (AVANTEX).

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ON OR AROUND JUL/THU/04; I INSPECTED THE HELI COURIER. IT WAS PER THE OWNER'S REQUEST THAT I CONDUCT AN ANNUAL INSPECTION. I DID THE ANNUAL INSPECTION. THE OWNER HAD ALL OF THE MANUFACTURER'S MAINT MANUALS ON HAND AT HIS FACILITY FOR MY USE. I USED OUR FBO'S COMPUTER AND CHKED AIRWORTHINESS DIRECTIVES. I CHKED AIRWORTHINESS DIRECTIVES THROUGH THE GOV FAA WEB SITE ON THE AIR FRAME; ENG; AND PROP; AND COMPLIED WITH ANY OUTSTANDING ITEMS. SOME TIME LATER; LOOKING THROUGH ANOTHER DATABASE (AVANTEX); I FOUND A FEW RECURRING AIRWORTHINESS DIRECTIVES THAT I MAY HAVE MISSED ON THE GOV WEB SITE. SO I CALLED THE OWNER AND REVISITED THE ACFT FOR ANY AIRWORTHINESS DIRECTIVES THAT I MAY HAVE MISSED; AND FOUND NO DISCREPANCIES. THE ACFT HADN'T YET FLOWN AFTER THE ANNUAL; AND I WAS PLEASED THAT I HAD CHKED ANOTHER DATABASE. I MAY HAVE NOT LOGGED ALL OF THE RECURRING AIRWORTHINESS DIRECTIVES; BUT THE IMPORTANT THING HERE IS THAT THE WORK WAS ACCOMPLISHED. ALSO; I HAD A HARD TIME FINDING THE SPECS FOR THE TYPE CERTIFICATE DATA SHEET THROUGH THE GOV WEB SITE; BUT THE AVANTEX DATABASE HAD ALL OF THE LISTINGS. SOLUTION: WHILE THE FAA GOV LISTINGS APPEAR TO BE COMPLETE; QUITE OFTEN THEY'RE NOT. THE ONLY WAY TO BE SURE IS TO COMPARE THE FAA LISTINGS TO A MORE COMPLETE DATABASE THAT IS PROFESSIONALLY UPDATED. WE ARE ACQUIRING AVANTEX DATABASE CDS.