Airworthiness Directives; Airbus Model A300 B2 and A300 B4 Series Airplanes; and Model A300 B4-600, B4-600R, and F4-600R Series Airplanes, and Model C4-605R Variant F Airplanes (Collectively Called A300-600 Series Airplanes)

Resumen

The FAA is revising an earlier NPRM for an airworthiness directive (AD) that applies to certain Airbus airplanes as listed above. The original NPRM would have required repetitively inspecting for cracking in the web of nose rib 7 of the inner flap on the wings, and performing related investigative/corrective actions if necessary. The original NPRM was prompted by reports of cracking in the web of nose rib 7 of the inner flap. This action revises the original NPRM by adding additional inspections for cracking in the web of nose rib 7 of the inner flap on the wings, and revising compliance times for certain airplanes. We are proposing this supplemental NPRM to detect and correct cracking in the web of nose rib 7, which could result in rupture of the attachment fitting between the inner flap and flap track no. 2, and consequent reduced structural integrity of the flap.