Failure analysis of components retrieved from the wreckage of a helicopter

Suresh Kumar, M and Madan, M and Venkataswamy, MA and Sujata, M and Parameswara, MA and Bhaumik, SK (2005) Failure analysis of components retrieved from the wreckage of a helicopter. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

Evidences suggest that the TGB had moved from its position by fracturing the mounting bolts. As a result, the tail rotor blades have hit the TRG causing fracturing of both TRG and TRBs. The most probable reason for failure of the TGB mounting bolts appears to be excessive load on the TGB due to some abnormalities in the tail rotor blades. However, with the available evidences, the nature of the problem on the tail rotor blades could not be identified. Hence it is necessary to establish the reason for the abnormal sound in the helicopter prior to the accident and also to ascertain whether or not the same could cause excessive load on the TGB. The damages seen in the input side of the TGB, which includes TDS, floating bearing, bearing support assembly and the couplings are secondary in nature and might have occurred after failure of the TGB mounting bolts. There were no evidences of delayed failure such as fatigue in any of the components examined.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Helicopter;TGB;TRB;TDS;overload
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 02 Nov 2011 11:23
Last Modified: 02 Nov 2011 11:23
URI: http://nal-ir.nal.res.in/id/eprint/10019

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