Electrostatic Discharge During Helicopter Hoist Operations: A Nationwide Prospective Study of the Norwegian Search
Jostein Rødseth Brede1,2,3, Arnfinn Storli4, Stein Bastian von Tangen-Jordan4
1Department of Anaesthesiology and Intensive Care Medicine, St. Olav's University Hospital, Trondheim, Norway.
Summary
Electrostatic discharge (ESD) occurred in 3.3% of Norwegian search and rescue (SAR) hoist operations, posing a significant occupational hazard. Moderate to severe incidents, equipment failures, and hospitalizations highlight the need for improved safety protocols for SAR personnel.
Area of Science:
- Aviation Safety
- Occupational Health
- Emergency Medicine
Background:
- Helicopter search and rescue (SAR) operations utilize hoists for patient access.
- Aircraft can accumulate electrostatic charges, leading to electrostatic discharge (ESD) through personnel.
- Published data on ESD incidence and clinical impact in SAR is limited.
Purpose of the Study:
- To determine the incidence and severity of ESD during hoist operations in the Norwegian SAR service.
- To identify risk factors and consequences associated with ESD in SAR missions.
Main Methods:
- A 1-year prospective observational study of all SAR hoist missions and training exercises by the 330 Squadron in Norway.
- Data collection included ESD occurrence, mission characteristics, atmospheric conditions, and discharge severity.
Main Results:
- ESD occurred in 3.3% of 839 hoist operations.
- Higher ESD risk was observed during over-water hoists (OR 2.18).
- Inadequate grounding (64%) and precipitation (71%) were noted; 49% of ESDs were moderate/severe, causing hospitalizations, equipment failure, and mission terminations.
Conclusions:
- ESD is a significant occupational hazard in Norwegian SAR, affecting 3.3% of hoist operations.
- Moderate to severe ESD incidents necessitate re-evaluation of safety protocols.
- Further investigation into ESD scope and health implications for SAR personnel is crucial.
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