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.
(-23) While in cruise with all engine instruments in normal operational limits, a dull bang was heard followed by a violent shaking of the helicopter. An auto-rotation was perform. After landing it was determined that a piston connecting rod had penetrated the crankcase.
As the FAA filed it
(-23) WHILE IN CRUISE WITH ALL ENGINE INSTRUMENTS IN NORMAL OPERATIONAL LIMITS, A DULL BANG WAS HEARD FOLLOWED BY A VIOLENT SHAKING OF THE HELICOPTER. AN AUTO-ROTATION WAS PERFORM. AFTER LANDING IT WAS DETERMINED THAT A PISTON CONNECTING ROD HAD PENETRATED THE CRANKCASE.
Other reports on N539H · 1
Matched to the same aircraft by N-number and date.