What was found
LIGHT ODOR LIKE MELTING PLASTIC, HAPPENED FOR 5 MINUTES THEN DISAPATED. HAPPENED ON 2 LEGS. LOW CONTINUED ALTITUDE. 4000-5000FT. NO SMOKE OR OTHER SIGNS OF AN ISSUE. CAPT REPORTED SMELL OF BURNING PLASTIC FROM THE GASPER DURING TAXI & APPROACH. SMELL DISIPITATED ON BOTH OCCASIONS. APU BLEED ON & SMOKE OR BURNING SMELL. PERFORMED INSPECTION OF COCKPIT FOR ODOR IAW TSM 05-50-00-810-831-A, NO SMELL OF ANY KIND AT THIS TIME IN THE COCKPIT OR CABIN. INSPECTED BOTH ENGINES & APU AREA AND FOUND NO LEAKS OR REASON TO CAUSE THE ODOR, LEVEL A DECONTAMINATION WAS COMPLETED IAW AMM 21-00-00-615-802-A, AGAIN NO ODOR OR SMOKE PRESENT DURING AN HOUR AFTER THE TEST WAS COMPLETED. CABIN SMELLS NORMAL AT THIS TIME.