FATIGUE RISK MANAGEMENT IN AIRCRAFT MAINTENANCE:

A SYSTEMATIC REVIEW OF PSYCHOLOGICAL RESILIENCE AND OPERATIONAL SAFETY

This study shows that fatigue is a major human factor risk for Aircraft Maintenance Technicians, reducing attention, decision-making, and safety performance. Fatigue is driven not only by long hours and shift work, but also by organizational, environmental, and psychological factors. The review emphasizes that Fatigue Risk Management Systems (FRMS) provide a proactive and effective solution, yet are still limited in maintenance operations. Integrating FRMS is essential to reduce errors, strengthen resilience, and improve overall aviation safety

This study presents a systematic review and document-based thematic analysis examining the impact of fatigue on psychological resilience and operational safety performance among Aircraft Maintenance Technicians (AMTs). Aircraft maintenance is widely recognized as one of the most critical operational pillars supporting aviation safety, as maintenance errors may directly compromise airworthiness and lead to severe safety consequences. Due to the continuous and safety-sensitive nature of maintenance operations, AMTs often work under demanding conditions characterized by shift-based schedules, high workload, time pressure, and exposure to environmental and organizational stressors. Within this context, fatigue emerges as one of the most significant human factors affecting technician performance and the overall reliability of aviation safety systems. Fatigue is not merely an individual physiological state but a multidimensional phenomenon involving cognitive, psychosocial, environmental, and organizational determinants. In the aviation maintenance domain, fatigue is commonly defined as a decline in mental and physical functioning associated with reduced alertness, slower cognitive processing, shortened attention span, and impaired decision-making capacity. Long working hours, irregular rest opportunities, sleep deprivation, circadian rhythm disruption, and sustained workload intensity contribute to both acute and chronic fatigue conditions. Given the low error tolerance inherent to maintenance activities, even minor fatigue-induced lapses may initiate chains of human error with system-wide safety implications. The causes of fatigue among AMTs extend far beyond physical workload alone. Environmental conditions such as inadequate lighting, excessive noise, temperature extremes, and ergonomically challenging workspaces increase fatigue risk. Organizational pressures including overtime, shift density, insufficient staffing, and managerial constraints further amplify fatigue exposure. Individual-level factors, such as stress management capacity, sleep hygiene, and work–life balance, also play an important role in shaping fatigue vulnerability. From a human factors perspective, fatigue-related errors must therefore be interpreted not as isolated acts of negligence but as outcomes of systemic operational conditions.

Empirical evidence indicates that fatigue is highly prevalent among aircraft maintenance personnel. Recent studies report that more than half of AMTs experience significant fatigue levels, with measurable negative effects on cognitive performance, attentional control, situational awareness, reaction time, and decision-making accuracy. Field research consistently demonstrates higher error rates and slower performance among technicians working night shifts or extended duty periods. In addition, fatigue has been associated not only with reduced safety performance but also with diminished quality of life and psychological well-being, suggesting a direct relationship between fatigue exposure and resilience capacity in safety-critical work environments.

The safety implications of fatigue have been documented in multiple real-world maintenance-related incidents. Several cases compiled in aviation safety databases illustrate how prolonged shifts, excessive overtime, and unmonitored workload accumulation contributed to inspection failures, maintenance errors, and degraded human performance. These examples reinforce the understanding that fatigue is not an abstract physiological condition but a direct operational safety hazard produced by work organization and insufficient risk mitigation mechanisms.



Within this framework, the Fatigue Risk Management System (FRMS) is increasingly recognized as a comprehensive and science-based approach for managing fatigue-related safety risks. Unlike traditional prescriptive duty-time regulations that focus solely on limiting working hours, FRMS provides a proactive risk management structure designed to identify fatigue hazards, assess operational risk, implement mitigations, and continuously monitor safety performance. International aviation authorities such as ICAO, EASA, FAA, and CASA have adopted FRMS principles to strengthen safety governance in fatigue-sensitive operational environments. However, the findings of this review indicate that FRMS has not yet been fully institutionalized within the aircraft maintenance sector to the same extent as in flight deck or air traffic control operations. This study employed a mixed qualitative design combining systematic literature review and institutional document analysis. Academic studies were collected from Web of Science, Scopus, and ScienceDirect, while fatigue-related guidance materials and regulatory frameworks were reviewed from authorities including ICAO, EASA, FAA, EUROCONTROL, and Turkey’s Directorate General of Civil Aviation (DGCA). The review followed the PRISMA 2020 guideline to ensure methodological transparency and traceability. Publications between January 2000 and October 2025 were screened using inclusion and exclusion criteria focusing specifically on fatigue, FRMS, human factors, and safety outcomes in aircraft maintenance contexts.

The thematic analysis was conducted using Braun and Clarke’s six-phase approach, resulting in the identification of four overarching themes that structure fatigue risk and FRMS integration in maintenance operations: (1) governance and regulatory framework, (2) human factors and organizational culture, (3) training and awareness, and (4) monitoring, measurement, and ergonomic improvement. Early research largely emphasized physiological fatigue indicators and environmental stressors, whereas more recent work increasingly conceptualizes fatigue as an organizational output requiring systemic governance and resilience-oriented intervention.

The review highlights that FRMS implementation in maintenance requires adaptation from models successfully applied in air traffic control and cockpit environments. ICAO Doc 9966 provides a broad framework applicable across safety-critical personnel groups, supporting hybrid systems that combine prescriptive limitations with performance-based fatigue risk management. Furthermore, Turkey’s GM-2025/3 circular demonstrates national-level legal recognition of fatigue risk governance for air navigation and AIM personnel, reinforcing the need for a comparable institutional structure targeting maintenance technicians.



In conclusion, this study argues that integrating FRMS into aircraft maintenance is essential not only for mitigating fatigue-related errors but also for sustaining long-term psychological resilience and organizational safety performance. Effective fatigue management must be supported through regulatory enforcement, organizational culture development, continuous education, ergonomic improvement, and data-driven monitoring systems. Establishing a national and sustainable FRMS framework tailored to AMTs would strengthen aviation safety governance, enhance workforce well-being, and reduce systemic operational risk across the maintenance domain.