IOSA SAFETY ASSESSMENT · By ASG
Why IOSA Safety Assessment Matters in 2025
The 2025 data reinforces the practical value of a strong IOSA safety assessment. IOSA should not be treated only as an external audit requirement — it is a structured operating framework that supports governance, operational discipline, risk control, evidence traceability, and cross-functional accountability. According to the IATA 2025 Safety Report, IOSA-registered operators continued to perform significantly better than non-IOSA operators, with an IOSA carrier accident rate of 0.98 per million sectors compared with 2.55 for non-IOSA carriers. Over the 2021–2025 period, the IOSA accident rate averaged 0.92 compared with 2.40 for non-IOSA operators — a sustained, long-term safety performance difference that strengthens the case for mature IOSA preparation and effective implementation.
This is particularly relevant for operators preparing for IOSA renewal audits, initial IOSA registration, risk-based IOSA transition work, internal safety and quality maturity assessments, and regulatory and customer oversight reviews. Airlines that use IOSA as a management tool rather than only an audit milestone are better positioned to identify weak controls early, prioritise higher-risk areas, and improve operational consistency across departments.
2025 Accident Data: Key Safety Trends for Airlines
The 2025 IATA Safety Report recorded 51 total accidents, down from 54 in 2024, with the global accident rate improving slightly to 1.32 accidents per million sectors from 1.42 in 2024. However, fatality risk increased significantly — from 0.06 in 2024 to 0.17 in 2025 — with 8 fatal accidents and 394 onboard fatalities. This confirms that safety reviews must examine not only how often events occur but also how severe they become when controls fail.
Several operational event categories remained important across the dataset, including tailstrike events, landing gear events, runway excursions, hard landings, ground damage, in-flight damage, controlled flight into terrain (CFIT), loss of control in-flight, and mid-air collision. Over the multi-year period, Loss of Control In-flight, CFIT, and Other End State categories show the highest fatality-risk weighting — confirming that effective SMS must prioritise these high-severity event chains through proactive hazard management, not just post-event investigation.
Regional Safety Performance:
The data shows significant regional differences in safety outcomes. In 2025, North Asia recorded an accident rate of 0.16 per million sectors, the Middle East 0.53, Asia Pacific 0.91, Europe 1.30, North America 1.68, and Africa 7.86. Regional variation reflects a combination of exposure patterns, aircraft mix, infrastructure, regulatory oversight maturity, and local operating context — not simple differences in crew competence. IOSA preparation priorities should be tailored to the airline’s specific regional risk profile and operating environment.
How IOSA Safety Assessment Improves Audit Readiness
A practical IOSA safety assessment helps airlines identify what is missing, what is weak, and what is not yet effectively implemented. Good preparation work translates standards into working controls and verifiable evidence. The typical scope of IOSA audit preparation support includes: IOSA gap analysis and evidence mapping against current ISAR requirements; documentation alignment; Safety Management System maturity review; internal audit and compliance monitoring improvement; corrective action plan development; management review and governance support; and mock audit preparation and operational coaching.
Airlines should approach IOSA assessment not as a one-time audit event but as a continuous improvement process. The gap between documented compliance and demonstrable implementation is the most common source of IOSA findings — and the most important area to address through structured internal assessment before the formal audit begins.
Connecting IOSA to Broader Safety Management:
For airlines also subject to EASA TCO, UK CAA TCO, or national regulatory oversight, IOSA preparation creates direct efficiency benefits. SMS documentation, compliance monitoring systems, and operational evidence developed for IOSA readiness are directly applicable to regulatory oversight requirements. Airlines that invest in mature IOSA preparation systems also tend to perform better in regulatory audits, authority oversight activities, and customer qualification assessments.
The 2025 data also reinforces the value of safety self-assessment and internal review as a complement to formal IOSA audits. Organisations that conduct structured internal assessments between audit cycles — reviewing SMS effectiveness, compliance monitoring outputs, SPI trends, and management review quality — are able to identify and address gaps continuously rather than discovering them at the point of formal audit. This approach aligns with the shift toward performance-based safety management in ICAO Annex 19, 3rd Edition.
Practical IOSA Preparation Actions
Conclusion
The 2025 safety data confirms that strong systems matter. Airlines that invest in audit readiness, effective implementation, risk-based oversight, and operational evidence are better positioned to reduce accident exposure and improve resilience. A focused IOSA safety assessment, combined with practical safety management review and disciplined follow-up action, can help turn standards into measurable safety performance improvement. Aero Support Group supports airlines worldwide with the consulting tools to build and maintain that capability.
An IOSA safety assessment is a structured review of an airline’s operational conformity, implementation evidence, safety controls, documentation, and management systems against IOSA requirements and industry best practice. It is used to identify gaps between documented compliance and actual implementation, prioritise corrective actions, and prepare the organisation for successful IOSA audit outcomes.
IOSA matters because it provides a structured operational framework that strengthens oversight, discipline, and implementation quality. The 2025 IATA accident data showed an IOSA carrier accident rate of 0.98 per million sectors compared with 2.55 for non-IOSA carriers. Over the 2021–2025 period, the average IOSA rate was 0.92 vs 2.40 for non-IOSA operators — demonstrating consistent, long-term safety performance advantages for IOSA-registered airlines.
Based on 2025 accident category data, priority preparation areas include: stabilised approach and go-around policies (runway excursion risk); CFIT and LOC-I prevention controls and crew training; FDM/FOQA programme effectiveness and management use of flight data; SMS integration with flight operations and ground handling interfaces; and the quality of occurrence reporting, trend analysis, and corrective action follow-up.
Between IOSA audits, structured internal assessments help airlines identify implementation gaps before the formal audit, monitor SMS effectiveness and SPI trends continuously, address corrective actions from the previous audit cycle, and strengthen evidence documentation. This approach supports ICAO Annex 19’s shift toward continuous safety performance management rather than periodic compliance cycles.
Aero Support Group provides comprehensive IOSA preparation support including gap analysis and evidence mapping against ISAR requirements, documentation alignment, SMS maturity review, internal audit programme improvement, corrective action plan development, management review support, and mock audit preparation. Our consultants have supported airlines across 100+ countries in achieving and maintaining IOSA registration.
- Conduct IOSA gap analysis and evidence mapping against current ISAR requirements
- Review SMS maturity — ensure safety management is operational, not just documented
- Assess FDM/FOQA programme effectiveness and management use of flight safety data
- Strengthen stabilised approach enforcement and go-around decision-making culture
- Review CFIT and LOC-I prevention controls, crew training, and terrain awareness systems
- Conduct mock IOSA audits to identify implementation gaps before the formal audit cycle
Preparing for IOSA, ISAGO, EASA TCO, or Part-145?
Aero Support Group supports airlines, MROs, airports, and aviation organisations worldwide with IOSA preparation, SMS consulting, regulatory compliance, and audit readiness aligned with ICAO, IATA, EASA, and FAA requirements.
References
- IATA 2025 Safety Report — Global aviation accident statistics and IOSA performance data
- IATA IOSA Programme Overview — Registration, standards, and audit process
- ICAO Safety Management Resources — Annex 19 and SMS implementation guidance
- SKYbrary — IOSA: IATA Operational Safety Audit overview and standards
- EASA Official Website — European aviation safety oversight and regulatory framework
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