What was found
WHEN TURNING ON PACKS, AFTER ENGINE START PLUS ON TAXI OUT. FLIGHT ATTENDANTS REPORT SMOKE IN THE CABIN AND GETTING WORSE. DUCT NR 2 AT45 DEG WITH TEMP CONT AUTO AND FULL COLD, SEL MAN AND FULL COLD TOOK 3 TO 4 MINUTES TO 0 DEGREES. FLIGHT ATTENDANTS REPORT EXHAUST SMELL. COMPLIED WITH MM SUP 96-31 DUCT CLEARING PROCEDURE ON NR 1 AND NR 2 PACK, OPERATED ON ALL ENGINE AIR SYSTEM AND APU AIR AFTER CLEARING PROCEDURE. NO SMOKE OR DEFECTS NOTED. (M)