What was found
AFTER TAKEOFF NOTED SMOKE IN CABIN, POSSIBLE ACM PROBLEM. RAN EMERGENCY CHECKLISTS AND RETURNED TO OKC NORMAL LANDING AT 133,00 LBS. PERFORMED ENGINE RUN WITH ACM IN OPERATION. NO FAULTS NOTED. PERF IAW MD-80 MM ENG RUN 71-00 ACM. CHECK PER MD-80 MM 21-32 PERFORMED CAUTIONARY VISUALLY EXTERIOR INSPECTION PER MD-80 MM 05-51-04, NO DEFECTS NOTED. (M)