AD NUMBER: 2008-10-14
MANUFACTURER: Rolls Royce
SUBJECT: Airworthiness Directive 2008-10-14 SUMMARY: We are adopting a
new airworthiness directive (AD) for the products listed above.
This AD results 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
directive 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 AD is 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. We are issuing this AD to detect corrosion that could
cause stage 2 or stage 3 disk of the low pressure turbine to fail
and result in an uncontained failure of the engine.