CFM's new blades, which can be installed on all CFM56-5B and -7B versions, include increased wall thickness and an optimized dovetail design to minimize stress.
Olivier Andries says that with CFM56 operators still investigating if they have AOG Technics parts in their fleet, the full extent of the problem is not known.
Boeing needs more time to validate the risks of mechanics inadvertently leaving nacelle access doors unlatched and develop ways to prevent that from happening.
The aircraft-maker has finished its proposed redesign of older 737 nacelles, but it must analyze maintenance-related errors to help mitigate their risk.