Airworthiness DirectiveEASA AD US-2020-07-51

[Final Rule] Engine - High Pressure Turbine 1st-Stage Disks - Removal

Published: Apr 14, 2020
Effective: Apr 28, 2020
Deadline: Apr 28, 2020

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What to do

Affected operators must remove the specified HPT 1st-stage disks from service within five engine cycles after the effective date of April 28, 2020. They should identify engines with the listed part and serial numbers and coordinate with maintenance providers to perform the removal promptly. Additionally, stakeholders are invited to submit comments on the directive by May 28, 2020.

Summary

[Final Rule] Engine - High Pressure Turbine 1st-Stage Disks - Removal is a Federal Aviation Administration (FAA) airworthiness directive addressing certain International Aero Engines AG (IAE) V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, and V2533-A5 turbofan engines. It mandates the removal from service of specific high-pressure turbine (HPT) 1st-stage disks due to an uncontained disk failure event on an Airbus A321-231 powered by an IAE V2533-A5 engine. This directive aims to prevent potential engine damage, aircraft damage, and loss of the airplane caused by high-energy debris from disk failure.

What changed

This new airworthiness directive introduces a mandatory removal of affected HPT 1st-stage disks, identified by specific part and serial numbers, from the listed IAE turbofan engines. It follows an emergency AD issued earlier and formalizes the requirement for removal within five cycles after the effective date. The directive is considered an interim action pending further investigation into the root cause of the failure.

Why it matters

This AD is critical for aviation professionals because it addresses a severe safety risk involving uncontained turbine disk failure, which can lead to catastrophic engine and aircraft damage. Operators and maintenance organizations must ensure compliance to maintain airworthiness and prevent in-flight incidents. The directive also impacts maintenance planning and parts inventory management due to the urgent removal requirement.

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