Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Repair Scheme BRG3086 Issue 1 instructs the repair of the High Pressure (HP) Compressor Front Drum Assembly Damping Grooves. This repair has an impact on the life of the High Pressure (HP) Compressor Front Drum Assembly.
We are proposing this AD to prevent failure of front HP compressor rotors, which could result in an uncontained engine failure and damage to the airplane.