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TsAGI Science Journal

ISSN Print: 1948-2590
ISSN Online: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2019031659
pages 453-459


Igor' Sergeevich Bugakov
Kazan National Research Technical University named after A.N. Tupolev (KAI)-10, K. Marx St., Kazan, Tatarstan, 420111, Russian Federation
Dmitry Valeryevich Nedel'ko
Kazan National Research Technical University, 10, K.Marx St., Kazan, Tatarstan, 420111, Russian Federation
Vladimir Alekseevich Shuvalov
Kazan Helicopters, 14 Tetsevskaya St., Kazan, Tatarstan, 420085, Russian Federation


The AR 29 Aviation Requirements and ARCH 2 Airworthiness Requirements for Civilian Helicopters are compared in terms of the reserve factor. Based on guidance developed at TsAGI, a probabilistic principle of determining the reserve factor in the strength calculation of the structure of any aircraft, including a helicopter, is given. A method to determine the reserve factor in order to confirm the sufficiency of a helicopter's structural strength at the flight test stage is proposed.


  1. Aviation Regulations, Part 29: Airworthiness Standards for Rotorcraft of Transport Category, accessed January 23, from, 2016.

  2. Selikhov, A.F. and Chizhov, V.M., Probabilistic Methods in Airplane Strength Computations, Moscow: Mashinostroenie, 240 pages, 1987 (in Russian).

  3. Mikhailov, S.A., Nedel'ko, D.V., Saltykov, S.V., and Shakirov, M.Z., A Probabilistic Approach to Improve the Reliability of Helicopter Designs with Adjustable Elements, TsAGI Sci. J, 47(4):449-456, 2016.

  4. Mil', M.L., Nekrasov, A.V., Braverman, A.S., Grodko, L.N., and Leikand, M.A., Helicopters: Computing and Designing. Book 2: Vibrations and Dynamic Strength, Moscow: Mashinostroenie, 1967 (in Russian).

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