Summary
We propose to supersede Airworthiness Directive (AD) 2017-07- 05, which applies to all Airbus SAS Model A300 series airplanes; and Model A300 B4-600, B4-600R, and F4-600R series airplanes, and Model A300 C4-605R Variant F airplanes (collectively called Model A300-600 series airplanes). AD 2017-07-05 requires repetitive detailed visual inspections of the main landing gear (MLG) leg components and replacement of the MLG leg if cracked components are found. Since we issued AD 2017-07-05, further investigation revealed that overhaul of the MLG does not alleviate the need for inspecting the MLG hinge arm/ barrel pin for cracking. This proposed AD would retain the requirements of AD 2017-07-05 and remove the credit for doing a MLG overhaul in lieu of the initial inspection of the MLG leg components. We are proposing this AD to address the unsafe condition on these products.