From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Aircraft experienced smoke in the cockpit after takeoff and returned safely to airport. Post incident investigation discovered that the APU alternator shaft seal had failed and was leaking oil. Oil may have contacted hot surfaces of APU and then entered environmental system, unable to determine exact cause.
As the FAA filed it
AIRCRAFT EXPERIENCED SMOKE IN THE COCKPIT AFTER TAKEOFF AND RETURNED SAFELY TO AIRPORT. POST INCIDENT INVESTIGATION DISCOVERED THAT THE APU ALTERNATOR SHAFT SEAL HAD FAILED AND WAS LEAKING OIL. OIL MAY HAVE CONTACTED HOT SURFACES OF APU AND THEN ENTERED ENVIRONMENTAL SYSTEM, UNABLE TO DETERMINE EXACT CAUSE.