FAA incident report · Bolkms BK117A3 · Phoenix, AZ · May 15, 1987
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.
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
While conducting shutdown another helicopter flew overhead. Downwash caused main rotors to strike vertical fins.
WHILE CONDUCTING SHUTDOWN ANOTHER HELICOPTER FLEW OVERHEAD. DOWNWASH CAUSED MAIN ROTORS TO STRIKE VERTICAL FINS.