Summary
The FAA proposes to supersede Airworthiness Directive (AD) 2013-26-01, which applies to all CFM International, S.A. (CFM) CFM56-3 and CFM56-7B model turbofan engines with a certain accessory gearbox assembly (AGB) not equipped with a handcranking pad oil dynamic seal assembly. AD 2013-26-01 requires an independent inspection to verify re-installation of the handcranking pad cover after removal of the pad cover for maintenance. Since the FAA issued AD 2013-26-01, a dual- engine oil loss event occurred, prompting CFM to revise its service information to provide procedures for reworking and reidentifying the AGB. The FAA has also evaluated the requirement to install a redesigned handcranking pad oil dynamic seal assembly in response to the dual- engine oil loss event. This proposed AD would continue to require independent inspection to verify re-installation of the AGB handcranking pad cover after maintenance. This proposed AD would require the replacement of the affected AGB asa terminating action to the inspection requirement. The FAA is proposing this AD to address the unsafe condition on these products.