Airworthiness DirectiveEASA AD US-2020-05-28

Engine - Main Gearbox Assembly and Electronic Engine Control Software - Removal / Installation

Published: Mar 20, 2020
Effective: Apr 21, 2020
Deadline: Apr 21, 2020
Replaces: 2019-11-08

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators must remove and replace the MGB assembly part number 5322505 with an eligible part and update the EEC software to version FCS5.0 or later. For engines on 180-minute ETOPS flights, this must be done before further flight after April 21, 2020. For 120-minute ETOPS engines, compliance is within 120 days from June 28, 2019, or before further flight after April 21, 2020, whichever is later. Non-ETOPS engines must comply at the next engine shop visit after April 21, 2020. Installation of certain prohibited parts and software versions is forbidden after the effective date.

Summary

The FAA Airworthiness Directive 2020-05-28 is a final rule addressing International Aero Engines LLC PW1133G-JM, PW1133GA-JM, PW1130G-JM, PW1129G-JM, PW1127G-JM, PW1127GA-JM, PW1127G1-JM, PW1124G-JM, PW1124G1-JM, and PW1122G-JM turbofan engines. It mandates the removal and replacement of the main gearbox (MGB) assembly and electronic engine control (EEC) software to prevent in-flight engine shutdowns caused by high-cycle fatigue fractures. This directive applies to engines operating on both ETOPS and non-ETOPS flights.

What changed

This AD supersedes AD 2019-11-08 by retaining its requirements for engines on ETOPS flights and adding new requirements for engines not operating on ETOPS flights to replace the MGB assembly and update the EEC software. It also updates references to the latest service information and clarifies installation prohibitions for certain parts and software versions.

Why it matters

This directive is critical for aviation professionals as it addresses a safety risk of engine failure due to MGB assembly fractures, which can lead to loss of thrust and potential loss of the aircraft. Operators and maintenance organizations must comply to ensure continued airworthiness and prevent in-flight shutdowns. Compliance helps maintain operational safety and regulatory conformity for affected engine models.

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