Combatting the Heat: Assessing Heat Stress Risks in Aircraft Maintenance Environments

Abstract: Aviation maintenance is a critical element to the success and safety of air transportation sector. Professionals in this field face several hazards associated chemicals and thermal exposure. Such a hazard can lead to serious incidents, including catastrophic aircraft accidents. Consequently, the implementation of appropriate hazard controls measures is vital not only for the prevention of workplace injuries and illnesses but also for promoting comfort and efficiency of aviation technicians. A major challenge in tropical regions is the heat exposure. Aviation maintenance facilities located in these hot climates face significant difficulties due to high temperatures and increased thermal loads during work. Extended exposure to heat stress can result in severe health issues in addition to causing physical fatigue and cognitive decline. Such effects can impair a mechanic's capacity to execute tasks safely and accurately, thereby increasing the risk of errors that could lead to fatal accidents. This study aims to investigate the effects of heat stress on aviation mechanics working in a tropical area and to propound innovative engineering and administrative controls to mitigate the impact of this factor on aviation mechanics. The primary research question focuses on whether aviation mechanics working in smaller hangars in tropical regions face an elevated risk of heat-related injuries.The assessment of heat stress risk was conducted in a flight maintenance hangar located in Florida, USA. During the assessment period, 18 full-time aviation mechanics were engaged in day shifts to complete both scheduled and unscheduled inspections and maintenance on various single and multi-engine aircraft. Environmental monitoring was performed using the REED R6200 WBGT Heat Stress Meter (Wilmington, NC, USA). Comparative analyses were performed across different sections of the hangar to identify hotspots and trends related to heat stress risk. The collected data was then compared to the Threshold Limit Values (TLV) established by the American Conference of Governmental and Industrial Hygienists (ACGIH) to determine if the measurements fell within acceptable limits.The investigation into heat stress within the targeted aviation maintenance hangar determined that the average Wet Bulb Globe Temperature (WBGT) was recorded at 27 ± 0.8 °C. This measurement is nearly aligned with the Threshold Limit Value (TLV) for heat stress established by the American Conference of Governmental and Industrial Hygienists (ACGIH), which is 27.5 °C. Considering a metabolic workload of 415 Watts, this WBGT suggests that aviation mechanics in this setting face a high risk of heat-related injuries. ACGIH guidelines recommend that under such strenuous conditions, a work/rest schedule comprising 50% work and 50% rest each hour should be adopted to effectively mitigate heat stress. Furthermore, certain sections of the hangar were identified as excessively hot, necessitating that work in these areas be restricted unless substantial engineering controls are implemented.The results indicate the urgent need for intervention to mitigate heat stress within the hangar environment. The recorded Wet Bulb Globe Temperature (WBGT) levels, in conjunction with the significant workload, indicate that workers are under potentially dangerous work conditions. To protect workers' health and prevent heat-related illnesses, it is essential to follow the recommended work/rest regimens and implement robust engineering controls. Such strategies may involve enhancing ventilation, deploying cooling systems, or modifying work hours to circumvent the peak heat times of the day.The study emphasizes the necessity of implementing proactive strategies for the management of heat stress. The current conditions, which approach the limits of safe working conditions, highlight the critical need for continuous monitoring and refinement of heat stress management protocols. By addressing these challenges, it is feasible to mitigate the likelihood of heat-related injuries and enhance a safer working environment for aviation mechanics, both in the short term and during peak heat seasons. This strategy not only protects the health of workers but also reduce the likelihood of errors which can lead to aviation disasters.

Keywords: WBGT, Heat Stress, Fatigue, Aircraft Maintenance Hangar, Aviation Mechanics

DOI: 10.54941/ahfe1006458

Cite this paper:

​