AT DISPATCH AN MD SUPER 80 WAS PUSHED INTO A CATERING TRUCK PARKED AT THE REAR ENTRANCE DOOR INCURRING SUBSTANTIAL DAMAGE TO THE L FLAP ASSEMBLY.

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AFTER AGENTS LEFT; THE FLT ATTENDANT CLOSED DOOR AND TOLD ME WE WERE READY TO GO. I CONTACTED TUG DRIVER. WE COMPLETED CHKLIST AND WE RECEIVED ATC CLRNC FOR PUSH. I SAID TO DRIVER 'OK; BRAKES RELEASED; CLRED TO PUSH.' SHORTLY AFTER BEGINNING PUSH; WE KNEW WE HIT SOMETHING. THE CATERING TRUCK WAS STILL PARKED AT AFT GALLEY. WING WALKER WAS PRESENT. CATERING TRUCK WAS PUSHED UP ON 2 WHEELS; BUT ONLY DRIVER WAS IN TRUCK AND UNHARMED. ACFT FLAP SUSTAINED SUBSTANTIAL DAMAGE. SUPPLEMENTAL INFO FROM ACN 417738: THERE WERE 2 WING WALKERS; 1 ON EACH TIP. THEY APPARENTLY WEREN'T WATCHING TOO WELL. CALLBACK CONVERSATION WITH RPTR ACN 417959 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS AN MD SUPER 80 AND SUSTAINED SUBSTANTIAL L FLAP DAMAGE. THE RPTR STATED THE ACFT WAS READY FOR DISPATCH WITH ALL PREFLT COCKPIT CHKS COMPLETED. THE RPTR SAID THE CABIN DOORS WERE CLOSED AND ALL WARNING LIGHTS OUT AND THE TUG OPERATOR WAS ADVISED THE BRAKES WERE RELEASED AND READY FOR PUSHBACK. THE RPTR STATED THE CABIN ATTENDANTS ATTEMPTED TO WARN THE COCKPIT OF THE CATERING TRUCK STILL PARKED AGAINST THE AFT BACK DOOR BUT WERE A LITTLE LATE. THE RPTR SAID THE L WING WALKER WAS FIRED AND THE CATERING TRUCK DRIVER WAS NOT CITED.