AD NUMBER: 2007-09-04
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive 2007-09-04
SUMMARY: The FAA is adopting a new airworthiness
directive (AD) for certain Boeing Model 777-200, 777-00, and
777-300ER series airplanes. This AD requires repetitive inspections
for discrepancies of the splined components that support the
inboard end of the inboard trailing edge flap; related
investigative, corrective, and other specified actions if
necessary; a one-time modification of the inboard support of the
inboard trailing edge flap by installing a new isolation strap and
attachment hardware; and repetitive replacement of the torque tube
assembly. For certain Boeing Model 777-200 series airplanes, this
AD also specifies prior or concurrent accomplishment of one-time
inspections of the flap seal panels for cracking and minimum
clearances, and of the torque tubes for damage; and related
investigative and corrective actions if necessary. This AD also
provides a terminating action (modification of the inboard main
flap) for the repetitive inspections. This AD results from reports
of corrosion on the torque tube and closeout rib fittings that
support the inboard end of the inboard trailing edge flap, as well
as a structural reassessment of the torque tube joint that revealed
the potential for premature fatigue cracking of the torque tube
that would not be detected using reasonable inspection methods. We
are issuing this AD to detect and correct corrosion or cracking of
the torque tube and closeout rib fittings that support the inboard
end of the inboard trailing edge flap. Cracking in these components
could lead to a fracture, which could result in loss of the inboard
trailing edge flap and consequent reduced controllability of the
airplane.
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