Summary
We propose to supersede airworthiness directive (AD) 94-12-03 that applies to certain Airbus Model A320 series airplanes. AD 94-12-03 requires modification of the belly fairing structure. Since we issued AD 94-12-03, fatigue testing of Model A320 series airplanes showed cracks at the lower riveting of the four titanium angles that connect the belly fairing to the keel beam side panels on both sides of the fuselage. This proposed AD also would require repetitive inspections for cracking of the four titanium angles between the belly fairing and the keel beam side panel, an inspection for cracking of the open holes if any cracking is found, and repair or replacement if necessary. This proposed AD would also expand the applicability of AD 94-12-03. We are proposing this AD to detect and correct cracking of the titanium angles that connect the belly fairing to the keel beam side panels on both sides of the fuselage, which could affect the structural integrity of the airplane.