AD NUMBER: 2017-18-21

PRODUCT: All Airbus Model A318 and A319 series airplanes; Model A320-211, -212, -214, -231, -232, and -233 airplanes; and Model A321-111, -112, -131, -211, -212, -213, -231, and -232 airplanes.

ACTION: Final Rule, request for comments

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2017-13-12, which applied to the airplanes listed above.

AD 2017-13- 12 required modification or replacement of certain side stay assemblies of the main landing gear (MLG). This new AD clarifies the formatting of a figure in the published version of AD 2017-13-12.

This new AD was prompted by reports indicating that affected parties misinterpreted the applicability of the affected part numbers due to the formatting of a figure in the published version of AD 2017- 13-12, which could result in a negative effect on compliance.

COST: The FAA estimates this AD affects 959 airplanes of U.S. registry. It is estimated that the cost of compliance with this AD will be $765 for labor and $14,104 for parts, for a total cost of $14,869 per aircraft. The cost is estimated to be $14,259,371 across the fleet.

DATES: This AD is effective September 28, 2017. Comments must be received by October 30, 2017.

FMI: AD