Summary
We are revising an earlier proposed airworthiness directive (AD) for certain Airbus Model A319 and A320 series airplanes. The NPRM proposed to require the modification of eight fastener locations in the longeron area below the emergency exit cut-outs on the left-hand (LH) and right-hand (RH) sides. The NPRM was prompted by a report that fatigue cracking could appear at certain fastener locations in the longeron area below the emergency exit cut-outs. This proposed AD is intended to complete certain mandated programs intended to support the airplane reaching its limit of validity (LOV) of the engineering data that support the established structural maintenance program. This action revises the applicability by adding post-Airbus modification 32208 airplanes, which are also affected. We are proposing this supplemental NPRM (SNPRM) to detect and correct cracking at certain fastener locations in the longeron area below the emergency exit cut-outs, which could lead to failure of thefasteners and reduced structural integrity of the airplane. Since these actions impose an additional burden over those proposed in the NPRM, we are reopening the comment period to allow the public the chance to comment on these proposed changes.