Audio captured by a reporter aboard the helicopter providing news coverage for NBC4 and Telemundo 52, which crashed in September in Los Angeles, recorded several audible warnings and a change in the aircraft's sound just seconds before the crash, according to a preliminary report from the National Transportation Safety Board (NTSB).
The tragic incident occurred on September 15 in Chatsworth, California, claiming the lives of three individuals: aerial reporter Eliana Moreno, pilot George Marciniw, and a person on the ground. The NTSB also noted one individual sustained minor injuries.
The helicopter, a Eurocopter AS 350 B2 with the registration N358TV, operated by Angel City Air, had departed from Whiteman Airport to capture footage of a fatal traffic accident in the area.
Flight Data and Preliminary Findings
According to ADS-B data analyzed by investigators, the helicopter circled the accident site for approximately one hour and 24 minutes. In the final minute of the flight, it was around 800 feet above ground level, and its ground speed decreased to roughly six knots.
A significant piece of evidence is a four-minute and 21-second video recorded by the reporter onboard. For most of this recording, the ambient noise from the engine and main rotor was consistent with normal operation. However, in the last 29 seconds, the sound frequency shifted, and intermittent, continuous alerts began to be heard.
Alarms and Descent
The NTSB identified alarms related to both high and low main rotor revolutions, among other aircraft warnings. Shortly thereafter, tracking data revealed the helicopter started a rapid descent while turning right. The final point recorded by the ADS-B system placed it directly above the crash site, with a high descent rate and a ground speed of approximately 38 knots.
Several security cameras from nearby buildings captured the helicopter's swift descent and collision with a metal container before it burst into flames.
Wreckage and Investigation Progress
Subsequent inspections found the fuselage almost entirely consumed by fire, with metal parts severely damaged. Both the main and tail rotors remained attached to their respective mounts. The wreckage has been moved to a secure facility for further analysis.
The released report remains preliminary and does not yet establish the crash's cause. The NTSB cautions that conclusions may change as the investigation progresses.
Understanding the NBC and Telemundo Helicopter Crash Investigation
What were the last sounds recorded in the helicopter before the crash?
The last sounds recorded included a change in frequency of the engine and rotor sounds, along with audible warnings indicating high and low main rotor revolutions.
How did the helicopter's flight data contribute to the investigation?
The ADS-B data showed the helicopter's flight pattern, altitude, and speed, revealing that it was circling the accident site for over an hour before rapidly descending and crashing.
What did the security cameras capture during the helicopter crash?
Security cameras documented the helicopter's rapid descent and its collision with a metal container before catching fire.