AD NUMBER: 2008-06-13
MANUFACTURER: CASA
SUBJECT: Airworthiness Directive 2008-06-13
SUMMARY: We are superseding an existing airworthiness
directive (AD) for the products listed above.
This AD results from mandatory continuing airworthiness
information (MCAI) originated 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: On 23 November
2006, Emergency Airworthiness Directive (EAD) Nr. (number)
2006-0351-E was published requiring an inspection to be performed
on C-212 aeroplanes having been used for Maritime Patrol or other
similar low altitude operations, due to the fact that, after
initial examination of the evidences of a recent C-212 Maritime
Patrol aircraft accident, cracks had been found in the centre wing
lower skin at STAY=1030. At the time of the accident, the aircraft
had accumulated 17,000 flight hours and 7,300 flight cycles. The
cracks were suspected to be caused by fatigue. A more detailed
examination in the laboratory, led to think that the initiation of
the fatigue cracks was produced by fretting, and EAD 2006-0365-E,
superseding EAD 2006-0351-E, was published on 4 December 2006 to
address the new situation. Further examination in the laboratory
has allowed to establish that crack initiation was due to fatigue
and the fretting was posterior. * * * * * * * The above mentioned
cracks, if not timely detected, could lead to reduced structural
integrity of the aircraft. * * * * * * * *We are issuing this AD to
require actions to correct the unsafe condition on these
products.
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