As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4003 - BURNING SMELL IN COCKPIT SHORTLY AFTER TAKEOFF AND SMOKE IN CABIN THROUGH APPROXIMATELY 6,000. NO OTHER ASSOCIATED FAILURE INDICATED OTHER THAN THE LAV SMOKE DETECTOR WENT OFF. ATL MECHANICS FOUND RAM AIR SWITCH IN THE WRONG POSITION. OPERATIONAL CHECKS WERE RAN ON BOTH PACKS AND WERE FOUND TO BE GOOD. (M)