What was found
DFW - FLT 885 - DURING TAKEOFF ATL-DFW WHEN LANDING GEAR RETRACTED, GEAR DID NOT RETRACT. OVERRIDE TRIGGER WAS USED AND GEAR RETRACTED NORMALLY. ABNORMAL PROCEDURES FOLLOWED FOR ENTIRE FLIGHT AND AIRCRAFT LANDED DFW WITHOUT INCIDENT. REPLACED LANDING GEAR ASSY UNIT. ACCOMPLISHED LANDING GEAR RETRACTION CHECK WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)