What was found
IMMEDIATELY AFTER LIFT-OFF, CREW HEARD LOUD NOISE THEN VIBRATION. CREW DECIDED TO RETURN TO CLT. UPON CHECKING THE SYSTEMS, THEY FOUND THAT THE ADG HAD DEPLOYED. AIRCRAFT LANDED OVERWEIGHT, BUT WITHOUT INCIDENT AND WAS ABLE TO TAXI TO THE GATE UNDER ITS OWN POWER. C/W INSP AFT ADG IN FLIGHT DEPLOYMENT, NO DEFECTS FOUND AT THIS TIME & SB FOR LIQUID PEN INSPT. NO DEFECTS NOTED. RESTOWED ADG. PERFORMED POST HIGHLOAD LANDING EVENT ACTION PROCEDURE, FOUND TO BE W/I LIMITS. NO FURTHER ACTION REQ'D