Airworthiness Directives; Turbomeca Turmo IV A and IV C Series Turboshaft Engines

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The FAA is adopting a new airworthiness directive (AD) for Turbomeca Turmo IV A and IV C series turboshaft engines. This AD requires identifying, inspecting and replacing flexible lubrication pipes manufactured after April 1, 2003. If both engines on the same helicopter each have an affected pipe, then this AD requires replacing one of the affected pipes before further flight. This AD also requires initial and repetitive borescope inspections of affected pipes, visual inspections for oil leakage, and visual inspections of the oil filter, on engines that are not required to have an affected pipe replaced before further flight by this AD. This AD results from 7 reports of oil leakage due to the deterioration of flexible lubrication pipes manufactured after April 1, 2003. We are issuing this AD to prevent dual-engine failure on a twin-engine helicopter.