MANUFACTURER: The Boeing Company Model 747-200C
and - 200F Series Airplanes SUBJECT: Airworthiness Directive 2010-07-03
SUMMARY: The FAA is superseding an existing
airworthiness directive (AD), which applies to certain Model
747-200C and -200F series airplanes. That AD currently requires
repetitive inspections to find fatigue cracking in the floor panel
attachment fastener holes of the upper chord of certain upper deck
floor beams in Section 41 (i.e., body station 520 and forward), and
repair if necessary. The existing AD also provides optional
modifications, which extend the threshold for initiating certain
repetitive inspections. This new AD requires additional repetitive
inspections to find fatigue cracking in the floor panel attachment
fastener holes of the upper chord of certain other upper deck floor
beams in Section 41 and Section 42 (i.e., aft of body station 520);
repetitive inspections to find fatigue cracking in the permanent
fastener holes of the upper chord of certain upper deck floor beams
in Section 41; and related investigative and corrective actions.
This new AD also provides a new optional modification, which
terminates certain repetitive inspections. This AD results from new
reports of cracking in the upper chord of the upper deck floor
beams in Sections 41 and 42, and new analysis that shows the
permanent fastener holes of the upper chord of certain upper deck
floor beams in Section 41 are also susceptible to fatigue cracking.
We are issuing this AD to detect and correct cracking in the upper
chord of the upper deck floor beams. Such cracking could extend and
sever the floor beams, which could result in rapid decompression
and loss of controllability of the airplane.
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