Analysis of components retrieved from the wreckage of an aircraft

Venkataswamy, MA and Sujata, M and Parameswara, MA and Bhaumik, SK (2004) Analysis of components retrieved from the wreckage of an aircraft. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

It appears most probable that the Watts linkage of the aircraft has experienced a tensile overload superimposed with bending stresses during which one of the bolts of the fork connector between the pogo stick and the frame got sheared off. Evidences also suggest that both the bolts of the fork connector were present at the time of failure and there were no abnormalities in the assembly. Tell tale marks on the inner surface of the fork of the link assembly suggest that the bolt connecting the lever and the link assembly of the control linkage port PFCU was present prior to the accident. Evidences also suggest that this joint has experienced compressive force due to impact leading to shearing off of the bolt and subsequent dislodgement of all the attaching parts. Certain damages were seen on the bolts and/or nuts of control linkage starboard PFCU and engine throttle control linkage in question, which probably have been caused by split pins. This means that split pins were present in these bolts at some given time during their service life. It was not possible to ascertain whether or not these bolts were fitted with split pins prior to the accident.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Aircraft Watts linkage;Pogo stick;control linkage PFCUs;engine throttle control linkage;split pin
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
Depositing User: Mrs Manoranjitha M D
Date Deposited: 25 Jul 2011 10:13
Last Modified: 25 Jul 2011 10:13
URI: http://nal-ir.nal.res.in/id/eprint/9572

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