As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG PLASTIC BURNING ODOR, AFTER TAKEOFF UNTIL 3000 FEET. ODOR RETURNED ON DOWN WIND AT 3000 FEET UNTIL TOUCHDOWN. PERFORMED FIM TASK 21-20-00-801A. NO FURTHER DEFECT NOTED. RAN AIR CONDITIONER (CREW) CAN NOT DUPLICATE ON THE GROUND. ACFT OK TO CONTINUE. (K)