AD NUMBER: 2005-08-09
MANUFACTURER: Boeing SUBJECT: Airworthiness Directive 2005-08-09 SUMMARY: The FAA is adopting a new airworthiness
directive (AD) for certain Boeing Model 747 series airplanes. This
AD requires repetitive detailed inspections for cracks in the
crease beam and adjacent structure of the fuselage, and related
investigative and corrective actions if necessary.
This AD is prompted by fatigue cracks found in the crease beam
during a follow-on inspection of a previously installed
modification. We are issuing this AD to find and fix fatigue
cracking of the fuselage frame, which could result in reduced
structural integrity of the frame and consequent rapid
decompression of the airplane.