Airworthiness Directives; Airbus Model A320 Series Airplanes

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This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Airbus Model A320 series airplanes. This proposal would require repetitive inspections to detect wear of the inboard flap trunnions, and modification or replacement, if necessary. This proposal would also require the eventual modification of the trunnions, which would terminate the repetitive inspections. This proposal is prompted by reports of wear damage found on the inboard flap drive trunnions that was caused by chafing of the Teflon rollers of the chain that actuates the sliding panel of the fairing. The actions specified by the proposed AD are intended to prevent such chafing and resultant wear damage, which could result in the failure of the trunnion primary load path; this would adversely affect the fatigue life of the secondary load path and could lead to loss of the flap.