Development of Load Spectrum for Full Scale Fatigue Test of a Trainer Aircraft

  • Andrzej Leski
  • Piotr Reymer
  • Marcin Kurdelski


PZL-130 “Orlik” is a turbo-propeller engine trainer airplane, entirely designed and build in Poland. This plane is used in Polish Air Force mainly for primary training of polish military pilots.

Current modernization of this airplane (which mainly consists of the engine and wings conversion) is enhanced by major change in the maintenance system. Maintenance system change program (SEWST) is carried through by EADS PZL-Okęcie (manufacturer) and ITWL (Air Force Institute of Technology). One of the major program task is a Full Scale Fatigue Test of the airframe which will be conducted by VZLU in Czech Republic. This article will present the methodology which was used to prepare a characteristic load spectrum for this test.

Following sections describe the whole process from statistical analysis of data recorded in the onboard flight recorders through strain gauge based flight load measurements to development of a fatigue load spectrum. As a result a characteristic flight load spectrum block was obtained representing equivalent 200 flight hours. This spectrum will be used in a Full Scale Fatigue Test which is designed to estimate fatigue life and critical points in the structure.

After completion of all the above described steps the obtained spectrum was both statistically consistent and representative for characteristic flight program in Polish Air Force. This guaranteed that the fatigue test based on this load spectrum will estimate actual fatigue life for these aircrafts operated in Polish Air Force and determine critical points in which structural damage may occur during operation.


Fatigue Life Load Spectrum Load Block Estimate Fatigue Life Horizontal Stabilizer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    PZL-130 Orlik Flight school program analysis for determiantion of flight spectrum severity, Report No. 134/31/2010, Air Force Institute of Technology, Warsaw, PolandGoogle Scholar
  2. 2.
    Technical documentation of the strain gauge instalaltion on PZL-130 Orlik TC-II trainer aircraft number 037, Report No. 89/31/2010, Air Force Institute of Technology, Warsaw, PolandGoogle Scholar
  3. 3.
    Kottkamp, E., Wilhelm, H., Kohl, D.: Strain gauge measurements on aircraft, NATO Advisory Group for Aerospace Research and Development. AGARDograph 7(160) (April 1976)Google Scholar
  4. 4.
    Skopionski, T.H., Aiken Jr., W.S., Huston, W.B.: Calibration of strain-gage installations in aircraft structures for the measurement of flight loads, NACA report nr 1178Google Scholar
  5. 5.
    Calibration of the strain gauges installed on PZL-130TC-II Orlik trainer aircraft number 037, Report No. 127/31/2010, Air Force Institute of Technology, Warsaw, PolandGoogle Scholar
  6. 6.
    Development of the flight load measurement procedure for the PZL-130 Orlik TC-II trainer aircraft, Report No. 57/31/2010, Air Force Institute of Technology, Warsaw, PolandGoogle Scholar
  7. 7.
    Development of the approximation equations for determining inner loads within PZL-130 "Orlik" TCII aircraft structure on the basis of recorded strain, Report No. 164/31/2010, Air Force Institute of technology, Warsaw, PolandGoogle Scholar
  8. 8.
    Leski, A.: An Algorithm of Selecting a Representative Load Sequence for a Trainer. In: 2nd International Conference on Engineering Optimization. Lisbon Portugal. CD, pp.1-8 (September 6-9, 2010),
  9. 9.
    Molent, L., Barter, S.A., White, P., Dixon, B.: Damage tolerance demonstration testing for the Australian F/A-18. International Journal of Fatigue 31, 1031–1038 (2009)zbMATHCrossRefGoogle Scholar
  10. 10.
    Air Force MIL-STD-1530C Aircraft Structural Integrity Program (ASIP)Google Scholar
  11. 11.
    Anderson, I.A., Parker, R.G.: Full Scale Fatigue Test of the Pilatus PC9/A trainer aircraft. In: 20th ICAF Symposium, Bellevue, Washington, USA, July 14-16 (1999)Google Scholar
  12. 12.
    Klimaszewski, S., Leski, A., Zurek, J.: The Role of AFIT in the Polish Aging Military Aircraft Programs. In: Proceedings of 7th Joint FAA/DoD/NASA Conference on Aging Aircraft, New Orleans, September 9-11 (2003)Google Scholar
  13. 13.
    Leski, A., Klimaszewski, S., Kurdelski, M.: The Assessment of Fatigue-Life Resources of the PZL-130 Orlik’s Structure. In: Sixth DSTO International Conference of Health & Usage Monitoring, Melbourne, Australia, March 6-9 (2009)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Andrzej Leski
    • 1
  • Piotr Reymer
    • 1
  • Marcin Kurdelski
    • 1
  1. 1.Air Force Institute of TechnologyWarsawPoland

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