Tue, Jun 30, 2009
AD NUMBER: 2009-14-02
MANUFACTURER: Boeing Model 747 Airplanes
SUBJECT: Airworthiness Directive 2009-14-02
SUMMARY: The FAA is superseding an existing
airworthiness directive (AD), which applies to certain Boeing Model
747 airplanes. That AD currently requires repetitive inspections to
detect evidence of wear damage in the area at the interface between
the vertical stabilizer seal and fuselage skin, and corrective
actions, if necessary. The existing AD also provides for an
optional terminating action for the repetitive inspections. For all
Boeing Model 747-100, 747-100B, 747- 100B SUD, 747-200B, 747-200C,
747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP
series airplanes, this new AD requires repetitive inspections for
wear damage and cracks of the fuselage skin in the interface area
of the vertical stabilizer seal and fuselage skin, a detailed
inspection for wear damage and cracks of the surface of any skin
repair doubler in the area, and corrective actions if necessary.
For airplanes on which the fuselage skin has been blended to remove
wear damage, this new AD requires repetitive external detailed
inspections or high frequency eddy current inspections for cracks
of the blended area of the fuselage skin, and corrective actions if
necessary. This AD results from reports of wear damage on airplanes
with fewer than 8,000 total flight cycles. In addition, there have
been three reports of skin wear damage on airplanes that applied
Boeing Material Specifications 10-86 Teflon-filled coating
(terminating action per the existing AD). We are issuing this AD to
detect and correct wear damage and cracks of the fuselage skin in
the interface area of the vertical stabilizer seal and fuselage
skin in sections 46 and 48, which could cause in-flight
depressurization of the airplane.
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