MAINT PERSONNEL DISCOVER A HOLE IN AN MD80'S FUSELAGE AFTER IT WAS PARKED ON ARR. THE FLC DIDN'T NOTE THE HOLE DURING A PREVIOUS INSPECTION.

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WE FLEW FROM CLT-DCA. AFTER TERMINATING THE FLT; MAINT INFORMED THE CAPT THAT A HOLE WAS FOUND IN THE FUSELAGE NEAR THE WATER SVC RECEPTACLE ON THE ACFT'S L SIDE FORWARD OF THE WING. WE DID NOT NOTE ANY DAMAGE TO ACFT WHEN A WALKAROUND INSPECTION WAS PERFORMED IN CLT. WE FLEW THE ACFT 1 LEG FROM CLT-DCA. WE DIDN'T NOTICE ANYTHING DIFFERENT IN THE ACFT'S FEEL OR PERFORMANCE. LESSON LEARNED: IF SOMEONE RUNS INTO (STRIKES) AN ACFT WITH ANY PIECE OF EQUIP; THEY MUST RPT THE INCIDENT SO IT CAN BE DETERMINED WHAT DAMAGE WAS DONE TO THE ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THAT HE HAD LOOKED AT THIS AREA DURING HIS WALKAROUND IN CLT AND HAD SEEN NO DAMAGE. THE CAPT AND HE HAD DISCUSSED FEELING A MOVEMENT IN THE ACFT WHILE AWAITING PUSH BACK; BUT THE FO DOES NOT THINK THAT WAS THE FORCE OF IMPACT THAT WOULD HAVE CAUSED THE HOLE. HE SUSPECTS THAT THE IMPACT MAY HAVE OCCURRED IN DCA WHILE THE FLC WAS OFF THE ACFT. HE IS NOT SURE; HOWEVER. SUPPLEMENTAL INFO FROM ACN 328989: AFTER TALKING TO MAINT; I DID RECALL THAT; WHILE WAITING TO PUSH BACK OUT OF THE GATE ABOUT 5 MINS PRIOR TO DEP TIME; WE DID FEEL WHAT I THOUGHT WAS JET BLAST MOVE THE ACFT. IT DID NOT APPEAR TO ME THAT ANYTHING ACTUALLY STRUCK THE ACFT.