TY  - JOUR
T1  - Failure Analysis of Refueling Door Assembly used on F-16 Military Aircraft
TT  - F-16 Askeri Uçağında Kullanılan Yakıt İkmal Kapağı Asamblesinin Arıza Analizi
AU  - Saraçyakupoğlu, Tamer
AU  - Deveci, Mustafa Özgür
AU  - Balli, Özgür
PY  - 2026
DA  - February
Y2  - 2025
DO  - 10.51785/jar.1768779
JF  - Journal of Aviation Research
JO  - JAR
PB  - İnan ERYILMAZ
WT  - DergiPark
SN  - 2687-3338
SP  - 53
EP  - 70
VL  - 8
IS  - 1
LA  - en
AB  - This study presents a detailed metallurgical analysis of the fracture failure that occurred at the hinge of the refueling door assembly located on the upper fuselage of the F-16 aircraft. The findings revealed that the fracture of the hinge’s auricle section resulted from a monotonic overload caused by an impact between the refueling boom and the door assembly due to improper alignment during in-flight refueling operations. Optical and Scanning Electron Microscopy (SEM) were used to characterize the fracture surface, enabling the identification of brittle cleavage features, river patterns, and the absence of fatigue striations, all indicative of a single overload event rather than cyclic fatigue. The study further observed visible evidence of mechanical distress, such as paint removal, dents, and scratches, corroborating the overload-induced impact mechanism. The findings underscore that even components designed to stringent aerospace standards may experience catastrophic failure when subjected to off axis loads and operational misalignment. Future studies may include finite element modeling to assess hinge redesign strategies under off-axis loading, as well as investigations into alternative materials and design modifications to enhance durability.
KW  - Refueling door assembly
KW  - Refueling boom
KW  - Metallurgical analysis
KW  - Monotonic overload
N2  - Bu çalışma, F-16 uçağının üst gövdesinde bulunan yakıt ikmal kapısı tertibatının menteşesinde meydana gelen kırılma arızasının ayrıntılı metalurjik analizini sunmaktadır. Bulgular, menteşenin kulakçık bölümündeki kırılmanın, uçuş sırasında yakıt ikmal işlemleri sırasında yanlış hizalama nedeniyle yakıt ikmal bomu ile kapı tertibatı arasındaki çarpışmanın neden olduğu monoton aşırı yükten kaynaklandığını ortaya koymuştur. Kırılma yüzeyini karakterize etmek için optik ve Taramalı Elektron Mikroskobu (TEM) kullanılmış ve bu sayede kırılgan yarılma özellikleri, nehir desenleri ve yorulma çizgilerinin bulunmaması tespit edilmiştir. Tüm bunlar, döngüsel yorulma yerine tek bir aşırı yük olayına işaret etmektedir. Çalışmada ayrıca, boya dökülmesi, ezikler ve çizikler gibi mekanik hasarın görünür kanıtları gözlemlenmiş ve bu da aşırı yükün neden olduğu darbe mekanizmasını doğrulamıştır. Bulgular, sıkı havacılık standartlarına göre tasarlanmış bileşenlerin bile eksen dışı yükler ve operasyonel yanlış hizalamaya maruz kaldıklarında ciddi arızalar yaşayabileceğini vurgulamaktadır. Gelecekteki çalışmalar, eksen dışı yükleme altında menteşe yeniden tasarım stratejilerini değerlendirmek için sonlu eleman modellemesini ve dayanıklılığı artırmak için alternatif malzemeler ve tasarım değişikliklerini içerebilecektir.
CR  - Ament, J., Lachmann, J., Schmelz, J., & Wandrey, L. (2024). Design and assessment of fighter pilot assistance systems for air-to-air refuelling with probe-and-drogue-equipment. CEAS Aeronautical Journal, 15, 1091–1110. https://doi.org/10.1007/s13272-024-00756-4
CR  - Akman, H., Turgut, A. E., & Çalışkan, H. (2022). Optimal design of an in-flight refueling door mechanism. Hittite Journal of Science and Engineering, 35(1), 27–36. https://doi.org/10.17350/HJSE19030000252
CR  - Armendáriz, I., Olarrea, J., & García-Martínez, J. (2015). Parametric analysis of a highly dynamical phenomena caused by a propeller blade loss. Engineering Failure Analysis, 57, 528–543. https://doi.org/10.1016/j.engfailanal.2015.03.007
CR  - Balli, O. (2020). Failure analysis of inlet guide vane (IGV) actuator and bellcrank assembly used on J85 turbojet engines. Engineering Failure Analysis, 115, 104700. https://doi.org/10.1016/j.engfailanal.2020.104700
CR  - Balli, O. (2021). Turbine wheel fracture analysis of Jet Fuel Starter (JFS) engine used on F16 military aircraft. Engineering Failure Analysis, 128, 105616. https://doi.org/10.1016/j.engfailanal.2021.105616
CR  - Bardis, K., Avdelidis, N. P., Ibarra-Castanedo, C., Maldague, X. P. V., & Fernandes, H. (2025). Advanced diagnostics of aircraft structures using automated non-invasive imaging techniques: A comprehensive review. Applied Sciences, 15(7), 3584. https://doi.org/10.3390/app15073584
CR  - Dally, M., & Guston, B. (2008). Jane’s aero-engines. Jane’s Information Group Limited. ISBN: 1478-2534
CR  - Hou, J., Wescott, R., & Attia, M. (2014). Prediction of fatigue crack propagation lives of turbine discs with forging-induced initial cracks. Engineering Fracture Mechanics, 131, 406–418. https://doi.org/10.1016/j.engfracmech.2014.06.001
CR  - Khalifeh, A. (2024). Fatigue failure in aircraft materials. In Sustainable Aviation (Vol. 283, pp. 63–79). Springer. https://doi.org/10.1007/978-3-031-65850-1_4
CR  - Lee, D., & Achenbach, J. D. (2016). Analysis of the reliability of a jet engine compressor rotor blade containing a fatigue crack. Journal of Applied Mechanics, Transactions ASME, 83(4), 041004. https://doi.org/10.1115/1.4032376
CR  - Ma, F., Cao, W., Luo, Y., & Qiu, Y. (2016). The review of manufacturing technology for aircraft structural part. Procedia CIRP, 56, 594–598. https://doi.org/10.1016/j.procir.2016.10.117
CR  - Ma, M., Wang, Z., Gao, Z., & Jiang, M. (2025). Ultrasonic phased array testing and identification of multiple-type internal defects in carbon fiber reinforced plastics based on convolutional neural network. Materials, 18(2), 318. https://doi.org/10.3390/ma18020318
CR  - Mishra, R. K., Srinivasan, K., Nandi, V., & Bhat, R. R. (2017). Failure analysis of an uncooled turbine blade in an aero gas turbine engine. Engineering Failure Analysis, 79, 836–844. https://doi.org/10.1016/j.engfailanal.2017.05.024
CR  - Mueller, E. (2024). Failure analysis and fracture. The Minerals, Metals & Materials Society (TMS).
https://www.tms.org/portal/downloads/profdev/pe_course_notes/Unit-17-Failure-Analysis-Fatigue-Fracture-Mueller_2024.pdf. Last Entered: 28 August 2025.
CR  - Noh, H. M., Benito, A., & Alonso, G. (2016). Study of the current incentive rules and mechanisms to promote biofuel use in the EU and their possible application to the civil aviation sector. Transportation Research Part D: Transport and Environment, 46, 298–316. https://doi.org/10.1016/j.trd.2016.04.007
CR  - Pantazopoulos, G. A. (2019). A short review on fracture mechanisms of mechanical components operated under industrial process conditions: Fractographic analysis and selected prevention strategies. Metals, 9(2), 148. https://doi.org/10.3390/met9020148
CR  - Park, M., Hwang, Y.-H., Choi, Y.-S., & Kim, T.-G. (2002). Analysis of a J69-T-5 engine turbine blade fracture. Engineering Failure Analysis, 9(5), 593–601. https://doi.org/10.1016/S1350-6307(01)00019-1
CR  - Purton, L., & Kourousis, K. (2014). Military airworthiness management frameworks: A critical review. Procedia Engineering, 80, 545–564. https://doi.org/10.1016/j.proeng.2014.09.111
CR  - Saptarshi, S. M., & Zhou, C. (2019). Basics of 3D printing: Engineering aspects. In M. Dipaola (Ed.), 3D printing in orthopaedic surgery (pp. 17–19). Amsterdam, Netherlands: Elsevier.
CR  - Schwarz, K. A. (2015). The design for manufacturing and assembly analysis and redesign of an aircraft refueling door hinge utilizing additive manufacturing (Master’s thesis, Embry-Riddle Aeronautical University). https://commons.erau.edu/edt/283
CR  - Terzioğlu, M. (2024). The effects of crew resource management on flight safety culture: Corporate crew resource management (CRM 7.0). The Aeronautical Journal, 128(1326), 1743–1766. https://doi.org/10.1017/aer.2023.113
CR  - Torbali, M. E., Zolotas, A., Avdelidis, N. P., Alhammad, M., Ibarra-Castanedo, C., & Maldague, X. P. (2024). A complementary fusion-based multimodal non-destructive testing and evaluation using phased-array ultrasonic and pulsed thermography on a composite structure. Materials, 17(14), 3435. https://doi.org/10.3390/ma17143435
CR  - Tyagi, A., Tripathi, R., & Bouarfa, S. (2023). Safety management system and hazards in the aircraft maintenance industry: A systematic literature review. Aviation, 27(3), 212–224. https://doi.org/10.3846/aviation.2023.19851
United States Air Force. (2016). Technical order of engine (T.O. 2J-J85-113-1). USAF.
CR  - Young, T. M. (2017). International standard atmosphere (ISA) table. In Performance of the jet transport airplane: Analysis methods, flight operations and regulations (pp. 583–590). Wiley. https://doi.org/10.1002/9781118534786.app1
CR  - 1st Air Maintenance Factory Directorate (1 HBFM). (2023). Eskisehir, Turkey
UR  - https://doi.org/10.51785/jar.1768779
L1  - https://dergipark.org.tr/tr/download/article-file/5170676
ER  -