Airworthiness Directive · Amendment 39-9134 · Boeing Model 747-100 Series Airplanes
Boeing Model 747-100 Series Airplanes
Superseded. A later AD replaced this one: AD 98-15-21, AD 99-10-09. Comply with the one in force.
Model 747-100 series airplanes; as listed in Boeing Service Bulletin 747-57A2266, Revision 4, dated November 3, 1994; certificated in any category.
This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 747-100 series airplanes, that currently requires repetitive inspections to detect cracking of the wing front spar web above engine numbers 2 and 3, and repair, if necessary. This amendment requires repetitive inspections to detect cracks in the web and cracked or broken fasteners in an area beyond that specified in the existing AD. This amendment also provides an optional terminating action for the repetitive inspections. This amendment is prompted by reports of broken fasteners and cracking of the web common to the upper and lower chords in an area outside the inspection zone specified in the existing AD. The actions specified by this AD are intended to prevent fuel leakage onto an engine and a resultant fire due to cracking or broken fasteners in the wing front spar.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
