The National Transportation Safety Board has released its initial investigative findings regarding the September 15, 2026, crash of a Eurocopter AS 350 B2 news helicopter near Chatsworth, California, providing significant new details about the aircraft’s final minutes before a rapid descent killed the pilot, a news reporter aboard the helicopter, and a person on the ground.
The helicopter, registration N358TV, was operated by Angel City Air as a Part 91 electronic news-gathering flight. According to the NTSB, the pilot and reporter departed Whiteman Airport (WHP) at approximately 5:24 p.m. and flew about nine miles west to Chatsworth, where they spent approximately one hour and 24 minutes maneuvering near the scene of a fatal traffic accident.
We previously discussed the Chatsworth news helicopter crash shortly after the accident, when federal investigators had released few details about what occurred before impact. The NTSB’s new findings now provide a much clearer picture of the helicopter’s altitude, speed, final maneuvering, onboard warning sounds, rapid descent, and impact sequence.
The Aviation Investigation Preliminary Report does not identify a probable cause. Instead, it documents facts collected during the opening stage of the investigation. Those facts raise important questions about what happened to the helicopter during its final seconds and why a flight that had remained over the news scene for more than an hour suddenly transitioned into a high-rate descent.
Helicopter Slowed to About Six Knots Before Entering a Rapid Descent
ADS-B information reviewed by the NTSB provides a detailed picture of the helicopter’s movement leading up to the crash.
After departing Whiteman Airport, N358TV proceeded west toward Chatsworth at an average altitude of approximately 1,600 feet mean sea level. The helicopter then maneuvered around the traffic-accident scene for approximately one hour and 24 minutes as the crew conducted its electronic news-gathering mission.
During the final minute of flight, the helicopter was operating at approximately 1,700 feet mean sea level, which the NTSB calculated as roughly 800 feet above ground level. The helicopter also decelerated to approximately six knots groundspeed. Moments later, ADS-B data showed the aircraft beginning a rapid descent while turning to the right. The final recorded ADS-B position showed the helicopter descending at a high rate with approximately 38 knots of groundspeed directly above the accident site.
Those details put renewed focus on the risk of low altitude flight. At approximately 800 feet above the ground, a helicopter experiencing an unexpected loss of lift, rotor-speed problem, control issue, or other emergency has substantially less altitude available for recovery before reaching buildings, vehicles, power lines, and other structures below.
The aircraft’s very low groundspeed immediately before the descent is also significant. News helicopters often maneuver slowly or hover while camera crews record an event on the ground. Low-speed flight is not itself evidence of improper operation. The important question is what occurred as the aircraft transitioned from that slow maneuvering condition into the rapid right-turning descent documented by the NTSB.
Helicopter control depends upon a closely coordinated relationship between engine output, main rotor speed, collective input, cyclic control, anti-torque control, and the aerodynamic condition of the rotor system. Investigators will continue examining whether the rapid descent resulted from an aircraft-system problem, pilot response to an abnormal condition, or some other event.
The flight occurred in visual meteorological conditions during daylight. The NTSB reported clear skies, approximately 10 miles of visibility, and no ceiling at the observation facility eight nautical miles from the accident location. Those findings make weather less prominent in the early factual record than several other aspects of the accident, although environmental conditions remain part of a complete aviation investigation.
Onboard Recording Captured Rotor RPM and Other Aural Warnings
One of the most important new pieces of information comes from a video recorded aboard the helicopter by the news reporter.
According to the NTSB, the recording lasted four minutes and 21 seconds and captured both the traffic accident below and ambient sounds from the helicopter, including sounds associated with the main rotor and engine. For most of the recording, the helicopter noise remained consistent with normal operation.
The sound changed during the final 29 seconds.
The NTSB reported that the recording captured a change in helicopter noise frequency along with intermittent and continuous horns consistent with the helicopter’s main-rotor high-RPM warning, low-rotor-RPM warning, and other aural advisories. The report does not state why those warnings activated or identify them as the cause of the crash.
Those warning sounds will likely become a major focus of the continuing technical investigation because rotor speed is fundamental to helicopter flight. Investigators can compare the audio sequence with ADS-B movement, wreckage examination, engine condition, rotor-system condition, and aircraft systems to determine what changed during those final seconds.
A potential mechanical failure remains one area investigators can examine, but the initial findings do not establish that a component failed. Warning systems can activate for different reasons, including an actual aircraft-system problem or changes in rotor speed occurring as part of another developing emergency.
The distinction requires technical analysis. Investigators will need to determine whether the engine was producing power, whether the drivetrain was transmitting that power normally, what happened to main rotor RPM, and whether the pilot’s control inputs can be reconstructed from the surviving wreckage and other information.
The condition of the wreckage provides additional clues but does not yet provide a final answer. The NTSB reported that the helicopter came to rest partially on its right side beside the metal storage container it struck. The debris field extended approximately 30 feet around the main wreckage. Major components remained attached to the fuselage or within the relatively compact debris area.
Although the tailboom separated, it remained beside the fuselage. Both the main rotor and tail rotor assemblies remained attached at their respective mounting assemblies. The fuselage itself was largely reduced to ash and thermally damaged metal as a result of the post-impact fire. The wreckage has been moved to a secure facility for additional examination.
The report does not identify component fatigue or another specific mechanical defect. Detailed examination of surviving parts can help investigators determine whether any component showed evidence of a condition that existed before impact rather than damage caused by the crash and fire.
Security Video and ADS-B Data Document the Final Descent
The Chatsworth accident is notable for the amount of recorded information surrounding the final portion of the flight.
Multiple security cameras on nearby buildings recorded the helicopter descending at a high rate before striking a metal storage container. A post-impact fire then developed rapidly. The NTSB classified the aircraft as destroyed and specifically reported an on-ground fire but no aircraft explosion.
That surveillance footage can be compared with ADS-B information and the reporter’s onboard recording to establish an unusually detailed timeline. Each source captures a different part of the accident sequence. ADS-B shows aircraft movement. The onboard recording captured changing helicopter sounds and warning horns. Exterior cameras show the aircraft’s descent and impact.
Together, those sources provide important evidence as investigators attempt to determine when the abnormal condition began and how quickly the accident developed.
The new findings also clarify the aircraft’s mission. Angel City Air was operating the helicopter under Part 91 as an electronic news-gathering flight. The pilot and reporter had traveled to Chatsworth specifically to gather video of a recent fatal traffic accident.
The applicable aviation laws and federal regulations form part of the operational framework for flights of this type. Part 91 status does not explain why this crash occurred, but it helps define the nature of the operation and the regulatory requirements applicable to the aircraft and flight.
The NTSB also identified Angel City Air as the operator and listed no operating certificates in the aircraft and operator information contained in the report. The investigation will continue examining the aircraft, pilot, operation, maintenance history, and other circumstances necessary to determine probable cause.
The new report therefore narrows some questions while creating others. Investigators now know that the helicopter had been maneuvering around the scene for an extended period, had slowed substantially during the final minute, generated multiple aural advisories during the final 29 seconds, entered a rapid right-turning descent, and struck a storage container at a high rate of descent.
What remains unresolved is why.
Legal Issues Remain Open While the NTSB Investigation Continues
The initial NTSB findings should not be mistaken for a final determination of responsibility.
Nothing in the report assigns fault to the pilot, Angel City Air, a maintenance company, a component manufacturer, or another entity. Likewise, the fact that warning horns sounded does not establish whether a system malfunction caused the accident or whether the warnings reflected conditions developing for another reason.
Investigators must continue examining the engine, drivetrain, rotor systems, flight controls, maintenance history, aircraft components, and operational record before reaching conclusions.
The three fatalities also mean that civil claims can depend heavily on what that investigation eventually establishes. A wrongful death claim can arise when negligent operation, deficient maintenance, defective equipment, or another legally actionable failure contributes to a fatal helicopter accident.
The person killed on the ground presents a particularly important aspect of this crash. That individual had no role in operating the aircraft yet was exposed to the consequences when the helicopter descended into a commercial area. The NTSB also documented one minor injury on the ground in addition to the three fatalities.
A helicopter crash attorney can help people affected by an aviation accident understand the legal issues that emerge as federal investigators develop additional findings, including potential claims involving the aircraft operator, maintenance providers, manufacturers, or other responsible parties.
The NTSB report is explicitly preliminary and subject to change. The agency has not yet identified probable cause. Its eventual conclusions will require further examination of the wreckage and other investigative materials.
Speak With an Aviation Accident Attorney After a Helicopter Crash
Spagnoletti Law Firm represents people affected by serious helicopter crashes and other catastrophic aviation accidents. Our aviation lawyers handle claims involving helicopter operators, aircraft maintenance, mechanical problems, and defective components. An aviation accident attorney can help an injured person understand the claims that may be available, identify potentially responsible parties, deal with insurers, and pursue compensation when negligence contributes to an aviation accident.
We offer a free consultation to discuss the circumstances of a helicopter accident and the available legal options. Our firm handles helicopter accident cases on a contingency fee basis, meaning clients do not pay attorney’s fees unless we obtain a recovery.
If you or a loved one has been impacted by a helicopter accident, call Spagnoletti Law Firm at 713-804-9306 or contact us online.