AN EMBRAER 145LR WAS DISPATCHED AND OPERATED IN NON COMPLIANCE WITH A FLAP ELECTRONIC CTL UNIT SVC PANEL NOT INSTALLED.

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ON MAY/MON/04; CAPT AND I PICKED UP ACFT AT ZZZ ARPT AT XA00 LCL. WE WERE GETTING THE ACFT FROM ANOTHER CREW THAT WAS RUNNING BEHIND SCHEDULE; WHICH WAS PUTTING US BEHIND SCHEDULE. I COMPLETED MY PREFLT WALKAROUND AND DID NOT FIND ANYTHING WRONG OR MISSING FROM THE ACFT AT THIS TIME. AFTER AN UNEVENTFUL FLT TO ZZZ1; WHILE COMPLETING MY PRE-POST FLT WALKAROUND OF THE ACFT; AS I WAS WALKING AROUND THE BACK OF THE ACFT AND COMING UP THE SIDE; I HAD TO WALK UNDER THE BELT LOADER WHICH MADE ME BEND DOWN FARTHER THAN NORMAL. I NOTICED A PANEL MISSING ON THE BELLY OF THE ACFT BTWN THE WHEELWELLS. I BROUGHT THIS TO THE ATTN OF THE CAPT WHO CALLED MAINT CTL AND THEY WENT OUT A CONTRACT MECH WHO SAID THE PANEL HAD BLOWN OFF INFLT. THE MECH MADE THIS STATEMENT BECAUSE IT LOOKED LIKE THE SCREW HEADS HAD SHEARED OFF. WE WERE SWAPPED INTO ANOTHER ACFT AND WENT BACK UP TO ZZZ TO FINISH OUR DAY. ON JUN/WED/04; I RECEIVED A CALL FROM THE ASSISTANT CHIEF PLT LETTING ME KNOW THAT THE ACFT HAD JUST COME OUT OF A 'C' CHK ON MAY/SUN/04 AND FLOWN BY 3 OTHER CREWS. I WAS ALSO TOLD THAT THE ACFT HAD COME OUT OF THE 'C' CHK WITH THIS PANEL MISSING. THE PANEL WAS FOUND SITTING ON A SHELF WITH SOMETHING COVERING IT IN ZZZ2 AT THE SHOP. THIS ACFT WAS SIGNED OFF TO RETURN TO SVC BY 3 INSPECTORS. 2 ACR MECHS ALSO SIGNED THIS ACFT OFF TO RETURN TO SVC. THIS PROB AROSE FROM A CHAIN OF EVENTS THAT STARTED WITH THE INSPECTION STATION IN ZZZ2 AND CONTINUED TO THE 4 CREW TO FLY THAT ACFT. THE INSPECTORS THAT SIGNED THAT ACFT OFF DID NOT FOLLOW THEIR PROC. THE ACR MECHS DID NOT FOLLOW THEIR PROCS AND THE PLT DID NOT DO A PROPER PRE-POST FLT WALKAROUND. ONE OF THE CONTRIBUTING FACTORS TO ME MISSING THE PANEL ON THE FIRST WALKAROUND WAS THE LATE ARRIVING ACFT AND THE RUSH TO GET THE FLT BACK ON SCHEDULE. THE CORRECTIVE ACTIONS TAKEN HAVE INCLUDED GOING TO REMEDIAL TRAINING TO GET RETRAINED ON THE PROPER WALKAROUND AND COUNSELING FROM THE ASSISTANCE CHIEF PLTS. SUPPLEMENTAL INFO FROM ACN 619393: MY FO DID OUR PREFLT WALKAROUND. WHEN HE FINISHED HE TOLD ME THE PLANE LOOKED FINE. UPON RETURNING TO THE ACFT; THE FO BROUGHT TO MY ATTN THAT A SVC PANEL WAS MISSING FROM THE ACFT. IT WAS THE SVC PANEL FOR THE FLAP ELECTRONIC CTL UNIT. A LCL MECH THOUGHT THE PANEL HAD BEEN ATTACHED; BUT THE SCREWS HAD BEEN OVER-TORQUED; BECAUSE ALL THE SCREWS WERE IN PLACE WITHOUT ANY HEADS. I WAS INFORMED LATER THAT THE PANEL HAD BEEN LEFT OFF DURING AN INSPECTION.