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.
En route #1 engine ran rough, backfired, was secured. Crankshaft broken in two places.
As the FAA filed it
EN ROUTE #1 ENGINE RAN ROUGH, BACKFIRED, WAS SECURED. CRANKSHAFT BROKEN IN TWO PLACES.
Other reports on N1666H · 2
Matched to the same aircraft by N-number and date.