AD NUMBER: 2009-02-08
MANUFACTURER: Turbomeca
SUBJECT: Airworthiness Directive 2009-02-08 SUMMARY: The FAA is
superseding an existing airworthiness directive (AD) for Turbomeca
Turmo IV A and IV C series turboshaft engines. That AD is
applicable to engines with oil-tank-to-oil-cooler flexible
lubrication pipes, part number (P/N) 0 249 92 813 0 or P/N 0 249 92
916 0, installed. That AD currently requires identifying,
inspecting, and replacing affected flexible lubrication pipes
manufactured after April 1, 2003. That AD also requires initial and
repetitive borescope inspections of affected pipes, visual
inspections for oil leakage, and visual inspections of the oil
filter. That AD also requires that if both engines on the same
helicopter each have an affected pipe, replacing one of the
affected pipes before further flight. This AD does not contain that
requirement. This AD requires the same inspections as the
superseded AD and adds inspection of
oil-pump-to-intermediate-bearing flexible lubricating pipe, P/N 0
249 92 808 0. This AD also requires all remaining affected flexible
lubrication pipes, P/N 0 249 92 813 0, P/N 0 249 92 916 0,and P/N 0
249 92 808 to be replaced as terminating action to the repetitive
inspections for those affected pipes. This AD results from
additional shutdowns caused by pipes, P/N 0 249 92 808 0,and the
introduction of Turbomeca Modifications TU 231 and TU 233 that
replace pipes, P/N 0249 92 813 0, P/N 0 249 92 916 0, and P/N 0 249
92 808. We are issuing this AD to prevent helicopter engine
in-flight shutdown of one or both engines resulting in an emergency
autorotation landing or accident.
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