AD NUMBER: AD 2004-03-09
MANUFACTURER: Boeing
SUBJECT: Wing Rear spar Inspection
SUMMARY: This amendment adopts a new airworthiness
directive (AD), applicable to all Boeing Model 747-100, 747-100B,
747-100B SUD, 747-200B, 747-200F, 747-200C, 747-300, 747SR, and
747SP series airplanes. This AD requires repetitive inspections for
discrepancies of the structure near and common to the upper chord
and splice fittings of the rear spar of the wing, and repair if
necessary. This AD also provides for an optional modification that,
if accomplished, terminates the repetitive inspection requirement,
but would necessitate eventual post-modification inspections. This
action is necessary to find and fix fatigue cracking of struct