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LIVE MOSAIC Town Hall (Archived): www.airborne-live.net

Mon, Nov 17, 2008

AD: Boeing

AD NUMBER: 2008-23-10
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive 2008-23-10
SUMMARY: We are adopting a new airworthiness directive (AD) for certain Boeing Model 747 airplanes identified above. This AD requires modifying the outboard flap track and transmission attachments. This AD results from a joint Boeing and FAA multi-model study (following in-service trailing edge flap structure and drive system events) on the hazards posed by skewing and failed flaps. This study identified the safety concerns regarding the transmission attachment design and the potential loss of an outboard trailing edge flap. We are issuing this AD to prevent certain discrepancies associated with this design (for example, a flap skew or lateral control asymmetry that can cause collateral damage to adjacent hydraulic tubing and subsequent loss of a hydraulic system), which could result in the asymmetric flight control limits being exceeded, and could adversely affect the airplane's continued safe flight and landing.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/

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