Superseded. This AD was superseded by AD 2021-16-08. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2019-12-05
Effective 07/05/2019 · Published 06/20/2019
Airworthiness Directives; CFM International S.A. Turbofan Engines
Summary
The FAA is adopting a new airworthiness directive (AD) for certain CFM International S.A. (CFM) CFM56-5B, CFM56-5C, and CFM56-7B model turbofan engines with a certain rotating air high-pressure turbine (HPT) front seal. This AD requires replacement of the affected rotating air HPT front seal with a part eligible for installation. This AD was prompted by cracks found in the rotating air HPT front seal. The FAA is iss…