DC9 CREW HIT CONSTRUCTION TRAILER ON TAXI-IN.

Narrative

WHILE TAXIING IN TO OUR RAMP AREA TO PARK; L WING SLAT MADE CONTACT WITH A CONSTRUCTION TRAILER PARKED OFF THE SIDE OF TXWY. WE WERE CLRED TO TAXI TO OUR PARKING SPOT VIA TXWY D1 (WILMINGTON; OH; ILN) WHICH HAD CONSTRUCTION GOING ON ON BOTH SIDES OF TXWY. THE CONSTRUCTION AREA ON THE R IS LIGHTED AND THE CONSTRUCTION AREA ON THE L IS UNLIGHTED AND VERY DARK. THE CONSTRUCTION TRAILER WAS PAINTED BLACK AND L APPROX 37 FT FROM THE TXWY CTRLINE. THE TXWY IS VERY NARROW WITH BARRICADES ON THE L SIDE AND LIGHT POLES AND OTHER EQUIP ALONG THE R SIDE. THE CAPT WAS TAXIING THE ACFT ON THE CTRLINE AND NEITHER HE; NOR I; OR OUR JUMP SEATER SAW THE CONSTRUCTION TRAILER AS WE APCHED. THE CAPT CAUGHT A GLIMPSE OF THE TRAILER OUT OF THE CORNER OF HIS EYE BUT IT WAS TOO LATE TO STOP. I NEVER SAW THE TRAILER OR FELT THE CONTACT. WE TAXIED TO OUR PARKING SPOT AND PARKED. POSTFLT INSPECTION VERIFIED THAT WE DID HIT THE TRAILER. THE VISIBLE DAMAGE TO THE ACFT CONSISTED OF 2 DENTS AND A SCRAPE IN THE L WING SLAT.