TSB Reports Fatal 2023 Helicopter Accident During Maintenance Run

This article is based on an official press release from the Transportation Safety Board of Canada.

On May 27, 2026, the Transportation Safety Board of Canada (TSB) released its final investigation report (A23P0040) detailing the circumstances surrounding a fatal incident that occurred three years prior. The incident, which took place on May 6, 2023, at Smithers Airport (CYYD) in British Columbia, involved an Airbus Helicopters AS 350 B3 operated by Mustang Helicopters Inc.

According to the official TSB press release and accompanying report, the accident occurred during a maintenance ground run, resulting in the death of one ground worker and serious injuries to another. The investigation highlights critical safety issues, specifically the severe dangers of procedural complacency and digital distraction in the cockpit during ground operations.

The Incident at Smithers Airport

Maintenance Ground Run Turns Fatal

The TSB report outlines that on the day of the accident, the Airbus AS 350 B3 helicopter (registration C-GUXR) was undergoing maintenance ground run operations. The specific procedure was designed to balance the tail rotor drive shaft, a highly technical task that requires the helicopter’s rotor system to be operated at nearly full RPM.

During the third maintenance ground run of the day, the aircraft suddenly entered an uncommanded and rapid rotation. At the time, two maintenance staff members were positioned on the ground near the helicopter’s left cargo door to monitor the balancing equipment. As the helicopter spun out of control, both workers attempted to evade the aircraft but were struck multiple times by the tail rotor. Tragically, one worker was fatally injured at the scene, while the other sustained serious injuries and was airlifted to a local hospital.

The TSB investigation notes that the pilot eventually managed to move the engine control to IDLE, shut off the fuel supply, and apply the rotor brake. The helicopter came to a rest after rotating approximately 540 degrees. The aircraft remained upright throughout the event, and no post-impact fire occurred.

Investigation Findings and Human Factors

Skipped Checklists and Unseen Hazards

In its analysis of the events leading up to the uncommanded rotation, the TSB identified several critical human factors and procedural deviations. Following the first maintenance run of the day, the pilot abbreviated the operator’s official checklist to expedite the process.

The pilot abbreviated the operator’s official checklist to expedite the process, viewing the task as “routine and repetitive.”

According to the TSB, this deviation meant that crucial safety steps were missed. Specifically, pressure was left in the hydraulic system, and the right anti-torque pedal remained engaged in a fully forward position. Because the checklist was skipped, this critical hazard went completely undetected prior to the third engine start.

The Role of Digital Distraction

A central finding of the TSB report is the role of digital distraction in the cockpit. Investigators found that the pilot’s attention was split between the highly sensitive maintenance operation and a cellphone, which was connected to a Bluetooth earpiece.

Because the pilot was looking down when the rapid rotation began, he was not expecting the sudden movement. The TSB concluded that his delayed response to the rotational yaw force was insufficient to stop the helicopter from spinning quickly. Investigators emphasized that the minimal time saved by skipping the official checklist was negligible and ultimately contributed to the fatal outcome.

Industry Implications and Safety Actions

Regulatory Blind Spots

The TSB report highlights a significant regulatory gap within the Canadian aviation framework. Currently, there are no Transport Canada regulations that explicitly prohibit the use of cellphones or personal electronic devices in the cockpit during operations.

The safety board has previously identified the severe risks associated with cellphone use in aviation accidents, noting that electronic devices can fatally divert a pilot’s attention from activities necessary for safe operations. The TSB presents this incident as a grim case study on the dangers of complacency during ground operations, which are often falsely perceived by crews as lower-risk than active flight.

Operator Corrective Measures

Following the tragic occurrence, Mustang Helicopters Inc. implemented several corrective safety measures aimed at preventing future incidents. According to the TSB report, the company introduced a strict new distraction policy that explicitly requires the stowing of all electronic devices during operations.

Additionally, Mustang Helicopters added a new standard operating procedure (SOP) specifically tailored for maintenance ground runs to its operations manual. The company also thoroughly revised and strengthened its hazard assessments and safety briefings for both maintenance personnel and pilots.

AirPro News analysis

We note that this tragic event underscores a critical vulnerability in modern aviation operations: the intrusion of personal electronics into safety-critical environments. While active flight operations often command a pilot’s full attention, ground operations, such as maintenance runs, can falsely appear lower-risk, inviting a dangerous level of complacency. The TSB’s findings suggest that regulatory bodies like Transport Canada may need to urgently modernize their frameworks to explicitly address digital distractions. Ensuring that the cockpit remains a sterile, focused environment, even when the aircraft is firmly on the ground, is paramount to preventing similar tragedies in the future.

Frequently Asked Questions (FAQ)

What caused the helicopter to spin during the maintenance run?

According to the TSB, the pilot skipped portions of the checklist, leaving hydraulic pressure in the system and the right anti-torque pedal in a fully forward position. When the engine was started for the third run, this caused an uncommanded and rapid rotation of the aircraft.

Why didn’t the pilot stop the rotation immediately?

The TSB investigation found that the pilot was distracted by a cellphone connected to a Bluetooth earpiece and was looking down when the rotation began. This distraction led to a delayed and insufficient reaction to the sudden yaw force.

Are pilots allowed to use cellphones in the cockpit in Canada?

The TSB report highlights that there are currently no Transport Canada regulations explicitly prohibiting the use of cellphones or personal electronic devices in the cockpit during operations, identifying this as a significant regulatory blind spot.

Sources

• Transportation Safety Board of Canada (TSB) Press Release
• Transportation Safety Board of Canada (TSB) Investigation Report A23P0040