What was found
AFTER TAKEOFF AT ABOUT 4,000 FEET, EXPERIENCED SMOKE IN THE CABIN. ALL 3 LAV SMOKE DETECTORS WENT OFF, RETURNED TO ATL. CLEANED APU INLET, PERFORMED DUCT BURNOUT.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AFTER TAKEOFF AT ABOUT 4,000 FEET, EXPERIENCED SMOKE IN THE CABIN. ALL 3 LAV SMOKE DETECTORS WENT OFF, RETURNED TO ATL. CLEANED APU INLET, PERFORMED DUCT BURNOUT.