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Sat, Nov 24, 2012

AD: The Boeing Company Airplanes (747)

AD NUMBER: 2012-22-02

PRODUCT: Certain Boeing Model 747-400, -400D, and -400F series airplanes.
SUBJECT: Airworthiness Directive 2012-22-02
ACTION: Final Rule

SUMMARY: This AD was prompted by reports of crown frame web cracking at left buttock line (LBL) 15.0, station (STA) 320. This AD requires measuring the web at STA 320 and, depending on findings, various inspections for cracks and missing fasteners, web and fastener replacement, and related investigative and corrective actions if necessary.

The FAA is issuing this AD to prevent complete fracture of the crown frame assembly, and consequent damage to the skin and in-flight decompression of the airplane.

DATES: This AD is effective December 26, 2012.

FMI: AD

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