CL65. FAA NAV REPRESENTATIVE DOES NOT CONSIDER FAA APPROVED AND CERTIFIED OVERWING EMER ESCAPE PLACARDS CORRECT.

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ON MY FLT FROM ORD TO OKC; I HAD A REPRESENTATIVE OF THE FAA POINT OUT TO ME ON THE GND BEFORE DEP; THAT A DIAGRAM ON A PLACARD FOR THE OVERWING EMER EXIT WAS DRAWN OR PRINTED INCORRECTLY. TO OPEN THE EMER OVERWING EXIT; YOU PULL OFF A PLASTIC COVER; WHICH COVERS A HANDLE. PULLING THE HANDLE ALLOWS YOU TO OPEN THE EMER OVERWING EXIT. THE FAA REPRESENTATIVE POINTED OUT TO ME THAT THE PROB WITH THE PLACARD IS THIS. THE DIAGRAM SHOWS THAT TO REMOVE THE PLASTIC COVER; YOU GRAB THE COVER WITH THE PALM OF YOUR HAND FACING DOWN; WHEN IN REALITY; YOU GRAB THE COVER WITH THE PALM OF YOUR HAND FACING UP. THE FAA REPRESENTATIVE; WHO SPECIALIZES IN NAVAIDS; THOUGHT THAT THIS COULD BE A PROB; AND TECHNICALLY I CAN UNDERSTAND WHY. I SPOKE WITH MY DISPATCHER; THE MAINT SUPVR; THE PERSON IN THE COMPANY WHO IS IN CHARGE OF AIRPLANE MANUAL REVISIONS AND ACFT CERTIFICATION; AND THE CHIEF PLT. THEY ALL REMINDED ME THAT THE AIRPLANE AND ALL OF ITS PLACARDS ARE APPROVED BY THE AIRPLANE MANUFACTURER AND MORE IMPORTANTLY; THE FAA. SINCE I WROTE UP THE DISCREPANCY; OUR MAINT SUPVR SIGNED OFF THE FLT LOGBOOK STATING THAT THE PLACARD WAS CORRECT AND PROPERLY INSTALLED. IN ADDITION; HE SHOWED ME IN THE AIRPLANE'S MAINT MANUAL; THE SAME EXACT PLACARD AND ITS LOCATION IN THE AIRPLANE. THIS IMPLIES TO ME THAT NOT ONLY IS THE PLACARD APPROVED BY THE FAA; BUT ITS ALSO REQUIRED TO BE ON THE AIRPLANE FOR IT TO BE LEGAL TO FLY. IN ADDITION; THE FAA REPRESENTATIVE TRIED TO REMOVE THE COVER AS DEPICTED IN THE 'INCORRECT DIAGRAM;' AND THE COVER STILL CAME OFF. I DECIDED TO CONTINUE WITH THE FLT TO OKC FOR ALL OF THE PREVIOUS REASONS AND BECAUSE IT DIDN'T MAKE SENSE TO GND THE AIRPLANE; OR TO GND THE ENTIRE FLEET OF OVER 40 JET AIRPLANES BECAUSE OF A PLACARD THE FAA HAD ALREADY APPROVED. I HAVE SUGGESTED THAT THE PLASTIC COVER OF THE PLACARD BE CHANGED IN ADDITION TO REQUESTING THAT THE COMPANY FIND A WAY TO RESOLVE THIS DISCREPANCY WITH THE FAA AND THE ACFT MANUFACTURER.