Failure analysis of undercarriage extension/retraction jack components of an aircraft

Madan, M and Sujata, M and Raghavendra, K and Gore, P and Bhaumik, SK (2011) Failure analysis of undercarriage extension/retraction jack components of an aircraft. Project Report. National Aerospace Laboratories, Bangalore, India.

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Following an incidence to an aircraft, a few components of the main undercarriage assembly were sent to this laboratory for investigation. Examination revealed that the piston of the extension/retraction jack has failed by bending overload. There were no evidences of progressive failure such as fatigue or stress corrosion cracking in this component. Deformation pattern seen on the other components suggested that during landing, the pivot assembly had rotated around the bearing axis connected with the links. Such a rotation had resulted in downward bending of the piston rod leading to its fracture. Analysis suggests that the situation under which the above said rotation in the pivot assembly with the piston in fully extended position is possible only when the attachment points of the link assembly with the undercarriage barrel, the pivot and the attachment point of the radius rod with the wing structure are not in one line. In view of this, it is suggested that the possibilities which could cause such a situation be examined for establishing the primary cause of failure in the main undercarriage assembly.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: Undercarriage;Overload failure;Assembly
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 12 Jul 2011 05:05
Last Modified: 12 Jul 2011 05:05

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