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A Human Factors Analysis and Classification System of Unsafe Acts in Philippine General Aviation Accidents

Jasper Edward Sace

Subject area: Science,Engineering and Technology  ·  Area of research: Aviation

DOI: 10.64388/IREV9I6-1712777

Abstract

A Human Factors Analysis and Classification System (HFACS) framework was applied to investigate human error in Philippine General Aviation (GA) accidents from 2019 to 2024. This study focuses specifically on Tier 1: Unsafe Acts, including skill-based errors, decision errors, perceptual errors, routine violations, and exceptional violations. Twenty-six accident reports from the Civil Aviation Authority of the Philippines (CAAP) were analyzed. Frequency distributions, Fisher?s Exact Test, and Cohen?s Kappa for inter-rater reliability were used. Results show Skill-Based Errors as the most recurrent unsafe act, particularly in-flight training and agricultural spraying. No statistically significant association was found between unsafe act type and accident outcome. Trends indicate reduced accident frequency in years with stronger regulatory oversight. The study recommends enhancements in pilot proficiency, regulatory compliance, and HFACS-based safety programs.

Keywords

Aviation Safety, HFACS, Human Error, General Aviation, Unsafe Acts

References

[1] Abesamis, P. P. R., De Dios Bulos, R., & Ching, M. (2020). Improving Aviation Incidents using Association Rule Mining Algorithm and Time Series Analysis. IOP Conference Series Materials Science and Engineering, 946(1), 012005. https:// 899x/946/1/012005

[2] Barnett, A. (2020). Aviation safety: a whole new world? Transportation Science, 54(1), 84– 96. https://

[3] Civil Aviation Authority of the Philippines. (2014). STATE SAFETY PROGRAMME . https://caap.gov.ph/wp- content/uploads/2023/09/state_safety_program me_edition_1.00.pdf

[4] Civil Aviation Authority of the Philippines. (2023, October 17). Philippines signs Management Service Agreement with ICAO. https://caap.gov.ph/philippines-signs- management-service-agreement-with-icao/

[5] Crowe, S., Cresswell, K., Robertson, A., Huby, G., Avery, A., & Sheikh, A. (2011). The case study approach. BMC Medical Research Methodology, 11(1). https://

[6] Cruz, G. S., & Sigua, R. (2017). Philippine Air Transport Safety: Analysis of Accidents and Incidents over the Last Two Decades. Journal of the Eastern Asia Society for Transportation Studies, 12. https://sci- hub.se/https://

[7] Dekker, S. (2001). THE RE-INVENTION OF HUMAN ERROR. Human Factors and Aerospace Safety , 1(3). https://trid.trb.org/view.aspx?id=717654

[8] Dekker, S. (2002). The Field Guide to Human Error Investigations . https://www.humanfactors.lth.se/fileadmin/lusa/ Sidney_Dekker/books/DekkersFieldGuide.pdf

[9] Dela Peña, A. (2025). Reducing human error in aviation: The impact of advanced training programs. SSRN Electronic Journal. https://

[10] Detwiler, C., Hackworth, C., Holcomb, K., & Shappell, S. (2007). Beneath the tip of the iceberg: A human factors analysis of general aviation accidents in Alaska versus. . . ResearchGate. https://www.researchgate.net/publication/23732 8084_Beneath_the_Tip_of_the_Iceberg_A_Hu man_Factors_Analysis_of_General_Aviation_A ccidents_in_Alaska_Versus_the_Rest_of_the_U nited_States

[11] Dumapias, I., & Avergonzado, J. (2021). Pilot Sensing Device Simulator. IASPER Interdisciplinary Research Journal, 14. https://aseanresearch.org/downloads/iasper/publ ication/14/1_IRVIN%20B%20DUMAPIAS.pdf

[12] Gaur, D. (2005). Human factors analysis and classification system applied to civil aircraft accidents in India. PubMed, 76(5), 501–505. https://pubmed.ncbi.nlm.nih.gov/15892552

[13] Griffin, T. G. C. (2008). The Limits of Expertise: Rethinking Pilot Error and the Causes of Airline Accidents. Ergonomics, 51(7), 1119 –1120.

[14] Harris, D., & Li, W.-C. (2005). HFACS Analysis of ROC Air Force Aviation Accidents: Reliability analysis and cross-cultural comparison. International Journal of Applied Aviation Studies, 5, 65 –81. https://www.researchgate.net/publication/25572 8827_HFACS_Analysis_of_ROC_Air_Force_A viation_Accidents_reliability_analysis_and_cro ss-cultural_comparison

[15] Human Factors Analysis and Classification System (HFACS). (2024, March 19). SKYbrary Aviation Safety. https://skybrary.aero/articles/human-factors- analysis-and-classification-system-hfacs

[16] ICAO Universal Safety Oversight Audit Programme (USOAP). (2022, June 19). SKYbrary Aviation Safety. https://skybrary.aero/articles/icao-universal- safety-oversight-audit-programme-usoap

[17] Iglesias, M. (2025, January 28). CAAP reports fewer aviation accidents in 2024 - Malaya Business Insight. Malaya Business Insight. https://malaya.com.ph/business/corporate/caap- reports-fewer-aviation-accidents-in-2024/

[18] Landis, J. R., & Koch, G. G. (1977). The Measurement of Observer Agreement for Categorical Data. Biometrics, 33(1), 159.

[19] Merriti, A. C., & Helmreich, R. L. (1996). Human factors on the flight deck. Journal of Cross-cultural Psychology, 27(1), 5–24. https://

[20] Nogueira, R. P. R., Melicio, R., Valério, D., & Santos, L. F. F. M. (2023). Learning methods and predictive modeling to identify failure by human factors in the aviation industry. Applied Sciences, 13(6), 4069. https://

[21] Number of aircraft in the United States 1990- 2022 | Statista. (2024, April 16). Statista. https://www.statista.com/statistics/183513/num ber-of-aircraft-in-the-united-states-since-1990/

[22] Oster, C. V., Strong, J. S., & Zorn, C. K. (2013). Analyzing aviation safety: Problems, challenges, opportunities. Research in Transportation Economics, 43(1), 148–164. https://

[23] Reason, J. (1990). Human error. https://

[24] Salcedo, D. A. (2024a, September 8). CAAP enforces security screening for private aircraft passengers. Aviation Updates Philippines. https://aviationupdatesph.com/2024/09/caap- enforces-security-screening-for-private-aircraft- passengers/

[25] Salcedo, D. A. (2024b, September 30). CAAP completes Air Traffic Management System upgrade. Aviation Updates Philippines. https://aviationupdatesph.com/2024/09/caap- completes-air-traffic-management-system- upgrade/

[26] Salway, Ruth & Wakefield, Jon. (2005). Sources of bias in ecological studiesof non-rare events. Environmental and Ecological Statistics. 12. 321-347. 10.1007/s10651-005-1516-5.

[27] Seva, R., Gutierrez, A. M. J., & Duh, H. B. L. (2007). Culture and communication in the Philippine aviation industry. In Lecture notes in computer science (pp. 806–813). https://

[28] Seva, R. R., Gutierrez, A. M. J. A., Duh, H. B. L., & Chong, J. (2007). An evaluation of CRM attitudes of Filipino pilots in four Philippine aviation companies. the International Journal of Aviation Psychology/the International Journal of Aviation Psychology, 17(3), 285–298. https://

[29] Shappell, S., Detwiler, C., Holcomb, K., Hackworth, C., Boquet, A., & Wiegmann, D. (2006). Human Error and Commercial Aviation Accidents: A Comprehensive, Fine-Grained Analysis using HFACS. Scholarly Commons. https://commons.erau.edu/publication/1218

[30] Shappell, S., Detwiler, C., Holcomb, K., Hackworth, C., Boquet, A., & Wiegmann, D. A. (2007a). Human Error and Commercial Aviation Accidents: An analysis using the Human Factors Analysis and Classification System. Human Factors, 49(2), 227–242. https://

[31] Shappell, S., & Wiegmann, D. (2003a). A Human Error Analysis of General Aviation Controlled Flight Into the Terrain Accidents Occurring Between 1990-1998. Embry Riddle Scholarly Commons . https://commons.erau.edu/cgi/viewcontent.cgi?a rticle=2314&context=publication

How to cite this paper

Jasper Edward Sace "A Human Factors Analysis and Classification System of Unsafe Acts in Philippine General Aviation Accidents" Iconic Research And Engineering Journals Volume 9 Issue 6 2025 Page 1072-1078 https://doi.org/10.64388/IREV9I6-1712777
Jasper Edward Sace "A Human Factors Analysis and Classification System of Unsafe Acts in Philippine General Aviation Accidents" Iconic Research And Engineering Journals, vol. 9, no. 6, Dec. 2025, doi: https://doi.org/10.64388/IREV9I6-1712777
Jasper Edward Sace (2025). A Human Factors Analysis and Classification System of Unsafe Acts in Philippine General Aviation Accidents. Iconic Research And Engineering Journals, 9(6). doi: https://doi.org/10.64388/IREV9I6-1712777
Jasper Edward Sace "A Human Factors Analysis and Classification System of Unsafe Acts in Philippine General Aviation Accidents" Iconic Research And Engineering Journals, vol. 9, no. 6, Dec. 2025. Crossref, https://doi.org/10.64388/IREV9I6-1712777
@article{1712777,
      author = {Jasper Edward Sace},
      title = {A Human Factors Analysis and Classification System of Unsafe Acts in Philippine General Aviation Accidents},
      journal = {Iconic Research And Engineering Journals},
      year = {2025},
      volume = {9},
      number = {6},
      pages = {1072-1078},
      issn = {2456-8880},
      url = {https://www.irejournals.com/formatedpaper/1712777.pdf},
      abstract = {A Human Factors Analysis and Classification System (HFACS) framework was applied to investigate human error in Philippine General Aviation (GA) accidents from 2019 to 2024. This study focuses specifically on Tier 1: Unsafe Acts, including skill-based errors, decision errors, perceptual errors, routine violations, and exceptional violations. Twenty-six accident reports from the Civil Aviation Authority of the Philippines (CAAP) were analyzed. Frequency distributions, Fisher?s Exact Test, and Cohen?s Kappa for inter-rater reliability were used. Results show Skill-Based Errors as the most recurrent unsafe act, particularly in-flight training and agricultural spraying. No statistically significant association was found between unsafe act type and accident outcome. Trends indicate reduced accident frequency in years with stronger regulatory oversight. The study recommends enhancements in pilot proficiency, regulatory compliance, and HFACS-based safety programs.},
      keywords = {Aviation Safety, HFACS, Human Error, General Aviation, Unsafe Acts},
      month = {December},
      doi = {https://doi.org/10.64388/IREV9I6-1712777}
  }