MANUFACTURER: Rolls-Royce Deutschland Ltd.
& Co. KG. (RRD) Models Tay 650-15 and Tay 651-54 Turbofan
Engines SUBJECT: Airworthiness Directive 2010-17-12R1
SUMMARY: The FAA is revising an existing
airworthiness directive (AD) for the products listed above. This AD
revision results from the need to correct the applicability
paragraph of that AD, and from mandatory continuing airworthiness
information (MCAI) issued by an aviation authority of another
country to identify and correct an unsafe condition on an aviation
product. The MCAI describes the unsafe condition as:
Strip results from some of the engines listed in the applicability
section of this AD revealed excessively corroded low- pressure
turbine disks stage 2 and stage 3. The corrosion is considered to
be caused by the environment in which these engines are operated.
Following a life assessment based on the strip findings it is
concluded that inspections for corrosion attack are required. The
action specified by this European Aviation Safety Agency (EASA) AD
2008-0122 was intended to avoid a failure of a low- pressure
turbine disk stage 2 or stage 3 due to potential corrosion problems
which could result in uncontained engine failure and damage to the
airplane. It has been later realized that the same unsafe condition
could potentially occur on more serial numbers for the Tay 650-15
engines and on the Tay 651-54 engines. This AD, superseding EASA AD
2008-0122, retaining its requirements, is therefore issued to
expand the Applicability in adding further engine serial numbers
for the Tay 650-15 engines and in adding the Tay 651-54
engines.
The FAA is issuing this AD to detect corrosion that could
cause the stage 2 or stage 3 disk of the LP turbine to fail,
uncontained engine failure, and damage to the airplane.
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