Investigation Summary
The flight departed Santa Ana at 09:07 PST under VFR. The aircraft, a Sikorsky S-76B manufactured in 1991 (MSN 760379), was carrying eight passengers and one pilot. As the helicopter progressed toward its destination, the pilot encountered a low cloud ceiling and haze. Due to traffic at Burbank Airport, the helicopter held over Glendale for 12 minutes before being cleared to proceed. The pilot requested and received a Special VFR clearance to transit the controlled airspace. As the terrain rose near Calabasas, the gap between the ground and the cloud ceiling narrowed significantly. At 09:44, the pilot informed air traffic control that he was climbing to 4,000 feet to get above the layers. During this climb, the helicopter entered the clouds, depriving the pilot of a visual horizon. The NTSB determined that the pilot likely suffered from 'the leans,' a form of spatial disorientation where the inner ear perceives the aircraft is level or turning in the opposite direction. Consequently, while the pilot believed he was climbing, the aircraft entered a steep, banked descent. The helicopter struck a hillside at a high rate of descent, resulting in a post-crash fire and total destruction of the airframe.
Final Conclusions
The NTSB determined the probable cause was the pilot's decision to continue VFR flight into IMC, resulting in spatial disorientation and loss of control. Contributing factors included the pilot's self-induced pressure to complete the mission for a high-profile client (plan continuation bias) and Island Express Helicopters' inadequate safety management oversight. The investigation also noted that while the helicopter was not equipped with a Terrain Awareness and Warning System (TAWS), such a system likely would not have prevented the crash due to the nature of the pilot's disorientation.
Photographic Evidence (1)
Video Analysis
NTSB Meeting: Calabasas, California, Helicopter Crash — Official NTSB board meeting discussing the findings, probable cause, and safety recommendations resulting from the investigation into the 2020 Sikorsky S-76B crash.
If playback is blocked, the owner has disabled embedding — use the link above.
Airframe & Maintenance
Crew Experience
Captain
Ara Zobayan. Certified flight instructor. The pilot had approximately 8,577 hours of total flight time at the time of the accident.
Systems & Failure Modes
Spatial Orientation
The pilot's reliance on visual cues was lost upon entering clouds, leading to vestibular illusions where his perception of the helicopter's attitude contradicted reality.
Safety Management System (SMS)
The NTSB found the operator's SMS implementation was inadequate, failing to provide sufficient oversight of pilot decision-making regarding weather risks.
Interesting Facts
- 01The pilot was highly experienced and had previously flown the same route for the same client.
- 02Island Express Helicopters was certified for VFR operations only; it was not authorized for IFR charter flights.
- 03The helicopter was not equipped with a Cockpit Voice Recorder (CVR) or Flight Data Recorder (FDR), as they were not required for this aircraft type.
- 04Air traffic controllers reported 2.5 miles visibility with haze to the pilot during the flight, though visibility at the crash site was later estimated between 1 and 1.5 miles.
- 05The impact occurred at a ground speed of approximately 160 mph in a steep descent.
Safety Actions & Advisories
Simulation Training Requirements
The NTSB recommended the FAA require Part 135 operators to use simulation devices for scenario-based training on recognizing and responding to inadvertent IMC.
Mandatory Flight Data Monitoring
Reiterated recommendations for the FAA to require all Part 135 operators to establish structured flight data monitoring (FDM) programs.
Crash-Resistant Recorders
Reiterated the need for turbine-powered helicopters to be equipped with crash-resistant systems that record cockpit audio, images, and parametric data.