Analysis of failed pitch change rod of a helicopter

Suresh Kumar, M and Sujata, M and Madan, M and Venkataswamy, MA and Bhaumik, SK (2006) Analysis of failed pitch change rod of a helicopter. Project Report. National Aerospace Laboratories, Bangalore.

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A failed pitch change rod of a helicopter was forwarded to the laboratory for analyzing the cause of failure. Investigation showed that the failure occurred due to pitting corrosion on the internal surface of the rod. Chlorine was found to be responsible for promoting pitting corrosion. Evidences suggest that the corrodants were carried through the lubricant. Hence contamination of the lubricant with chlorine ion appears to be the most probable reason for the failure. In view of this, it is recommended that the oil drained out from the TGB be chemically analyzed to look for chlorine and water, present, if any. No material abnormalities were found responsible for the failure.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: Helicopter; pitch change rod; corrosion
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Raghavendra R chandu
Date Deposited: 25 Jul 2011 04:48
Last Modified: 25 Jul 2011 04:48

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