As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF FROM DSM, THE LT PACK TRIPPED AND THE LT DUCT OVERHEAT LIGHT ILLUMINATED. THIS WAS ACCOMPAINED BY THE USUAL ODOR OF A PACK OVERHEATING AND SMOKE IN THE COCKPIT. QRH PROCEDURES ELIMINATED THE SMOKE & REESTABLISHED THE LT PACK. GIVEN THE OUTSIDE AIR TEMPERATURE AT DSM OF 21 DEGREES C, FOUND COOLING FAN GETTING POWER BUT FAN NOT OPERATING JUST HUMMING WITH A BURN SMELL COMING FROM FAN. R & R LT PACK COOLING FAN REF AMM 21-56-091-4.