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Sat, May 09, 2009

AD: Boeing

AD NUMBER: AD 2009-09-08

MANUFACTURER: Boeing Model 747 Airplanes
SUBJECT: Airworthiness Directive AD 2009-09-08

 

 

SUMMARY: We are adopting a new airworthiness directive (AD) for certain Boeing Model 747 airplanes. This AD requires repetitive external surface high frequency eddy current inspections to detect cracks in the radius detail of the upper lobe doubler on both sides of the airplane, and applicable corrective action. This AD results from reports of cracks in the radius detail of the upper lobe doublers. We are issuing this AD to detect and correct cracks in the upper lobe doublers. Such cracks could result in significant degradation of the fuselage structure and reduce its ability to carry flight loads from the vertical stabilizer, which could adversely affect the controllability of the airplane.

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/11951EE867F61785862575AF0054246F?OpenDocument

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