What was found
ACRID SMELL (LIKE PLASTIC BURNING/HOT WIRING) DETECTED IN COCKPIT WHEN ENG A/ICE TURNED ON. SMELL DISSPATED WHEN PACK ONE WAS TURNED OFF AND ENG A/ICE TURNED OFF. -INSPECTED BOTH ENGINES NO SIGNS OF INGETSTION FOUND. PERFORMED ENG. RUN WITH BOTH ENGINES. IAW AMM 71-00-00 PERFORM OPS CHECK OF ENG. ANTI-ICE IN BOTH ENGINES WITH BOTH PACKS RUNNING IAW AMM 30-21-00 AND 36-11-00 NO BURNING OR PLASTIC SMELLS NOTED. A/C OK FOR SERVICE.