The paper analyses the causes of the incident of an F-4 which landed abnormally due to a crack in the nose landing gear hydraulic actuator cylinder. Striations, typical of a fatigue crack, were observed on the fracture surface and a large quantity of corrosive oxide was detected in the initial stage of the crack. Furthermore, surface pits caused by corrosion were found inside the cylinder. A surface flaw of this kind was connected to the fracture surface as a microscopic crack. By analyzing the fractography and metallography of the failed parts, it is found that the cylinder pitted as a result of chemical reaction with internal fluids, the pitting became a microscopic crack and caused failure.
Failure analysis of nose landing gear assembly
Schadensanalyse eines Bug-Flugzeugfahrwerkes
Engineering Failure Analysis ; 10 , 1 ; 77-84
2003
8 Seiten, 13 Bilder, 2 Tabellen, 3 Quellen
Aufsatz (Zeitschrift)
Englisch
Aircraft landing gear arrangement and a nose landing gear assembly
Europäisches Patentamt | 2017
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