Summary
We propose to adopt a new airworthiness directive (AD) for certain Airbus Model A318, A319, A320, and A321 series airplanes. This proposed AD was prompted by an evaluation by the design approval holder (DAH) which indicates that the main landing gear (MLG) does not comply with certification specifications, which could result in a locking failure of the MLG side stay. This proposed AD would require modification or replacement of certain MLG side stay assemblies. We are proposing this AD to prevent possible collapse of the MLG during takeoff and landing.