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Helicopter Transmission Oil Discolouration
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV
Pagination or Media Count:
An increase in the incidence of abnormal discolouration of oil in ADF helicopter tail rotor transmissions has been observed and reported over the last eight years. Aircraft maintainers have initially attributed the discolouration to a range of contamination modes including incorrect fluid addition, hydraulic fluid contamination and degraded fluid. A program of work was conducted at DSTO to identify and characterise the cause of the abnormal discolouration. This report details the identification of a coloured metal quinizarate salt which forms in the aircraft transmissions under normal operating conditions and describes the mechanism of formation and some characteristics of the quinizarate salt to assist in developing maintenance programs to manage the coloured salt when observed in service conditions.
APPROVED FOR PUBLIC RELEASE