Summary
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 for fatigue cracking of the bottom flanges of the longitudinal floor beams at frame 43; and repair, if necessary. This proposal also would require a one-time inspection for fatigue cracking of the fastener holes in the longitudinal floor beams, and modification of the floor beams, which would constitute terminating action for the repetitive inspections. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent fatigue cracking on the bottom flanges of the longitudinal floor beams, which could result in reduced structural integrity of the airplane.