MANUFACTURER: The Boeing Company Model 747
Airplanes SUBJECT: Airworthiness Directive 2010-14-07
SUMMARY: The FAA is superseding an existing
airworthiness directive (AD), which applies to certain Model 747
airplanes. That AD currently requires repetitive inspections of the
body station (BS) 2598 bulkhead, and corrective actions if
necessary. That AD also currently requires a terminating
modification for certain repetitive inspections and a post-
modification inspection of the modified area. This new AD continues
to require those actions using revised service information. For
certain airplanes, this AD requires new repetitive inspections, an
interim modification, and post-interim modification inspections.
For certain airplanes, this AD requires replacing any previously
repaired aft inner chord and reinstalling the terminating
modification. For airplanes that are converted to the Model 747-400
large cargo freighter (LCF) configuration, this new AD reduces the
threshold and repeat intervals of certain post-modification
inspections. For all airplanes, this new AD also requires certain
inspections of the upper aft outer chords and diagonal brace
attachment fittings, flanges, and rods to continue after the
terminating modification. This AD results from reports of cracked
aft inner chords on airplanes after certain requirements of the
existing AD were done. The FAA is issuing this AD to prevent
fatigue cracking of the BS 2598 bulkhead structure, which could
result in inability of the structure to carry horizontal stabilizer
flight loads, and loss of controllability of the airplane.
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