AD NUMBER: 2019-03-04

PRODUCT: All Engine Alliance (EA) GP7270 and GP7277 turbofan engines with a certain engine fan hub assembly.

ACTION: Final rule; request for comments.

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2018-11-16 for the engines listed above.

AD 2018-11-16 required a one-time eddy current inspection (ECI) of the engine fan hub blade slot bottom and blade slot front edge for cracks, a visual inspection of the engine fan hub assembly for damage, and removal of parts if damage or defects are found that are outside serviceable limits.

This AD retains these requirements, but expands the population of affected engine fan hub assemblies and revises the compliance time for the inspections. This AD was prompted by the FAA's determination that inspections need to be expanded to all EA GP7270 and GP7277 turbofan engines.

DATES: This AD is effective March 6, 2019. Comments must be received by April 5, 2019.

COST: The FAA estimates that this AD affects zero engines installed on airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD:

• ECI and visual inspection 14 work-hours × $85 per hour = $1,190 per aircraft.

FMI: AD