What was found
AFTER TAKEOFF AFTER TURNING ON FREON AIR CONDITIONER SMELLED A BURNING ODOR IN THE CABIN. ACCOMPLISHED A VISUAL INSPECTION & AN OPS TEST WITH GROUND POWER OF THE FREON AC SYS, NO DEFECTS OR ABNORMAL ODORS NOTED. RAN BOTH ENGS AT 855 N2 CYCLING, ENVIRONMENTAL CONTROL FROM FULL HOT TO FULL COLD IN AUTO MANUAL MODES WHILE SWITCHING BETWEEN LT, NORMAL & RT PRESS SOURCES, NO ABNORMAL ODORS NOTED. ACTIVATED FREON AC WHILE SWITCHING FROM LT NORMAL & RT PRESS SOURCES, NO ODOR COULD NOT DUPLICATE ORIGINAL DISCREPANCY. WORK PERFORMED IAW MM 21-00-00.