Sat, Mar 01, 2008
AD NUMBER: 2008-04-22
SUBJECT: Airworthiness Directive 2008-04-22
SUMMARY: We are adopting a
new airworthiness directive (AD) for the products listed above.
This AD results from mandatory continuing airworthiness
information (MCAI) originated by an aviation authority ofanother
country to identify and correct an unsafe condition on an aviation
product. The MCAI describes the unsafe condition as: Reports have
been received from Fokker 100 (F28 Mark 0100) operators where the
crew experienced difficulties with roll control.
Analysis suggests that these phenomena are due to frozen water
on the aileron pulleys that are installed on the Center Wing Spar
and located in the Main Landing Gear (MLG) wheel bays.
Investigation has confirmed that improper closure of the
aerodynamic seals of the wing-to-fuselage fairings above the MLG
wheel bays can cause rainwater, wash-water or de-icing fluid to
leak onto the affected aileron pulleys.
This condition, if not corrected, can lead to further incidents
of frozen water on aileron pulleys during operation of the
aircraft, resulting in restricted roll control and/or higher
control forces. * * *
We are issuing this AD to require actions to correct the unsafe
condition on these products.
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