EASA Regulations for Pratt & Whitney PW4090

9 airworthiness directives and regulations affecting Pratt & Whitney PW4090.

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New ADs and bulletins for Pratt & Whitney PW4090, summarized like the ones below, every Monday.

EASA AD US-2026-17-08

Sep 8, 2026

Turbine - High-Pressure Compressor Drum Rotor Disk - Inspection / Replacement

The Federal Aviation Administration Airworthiness Directive 2026-17-08 is a final rule addressing certain Pratt & Whitney Division engines, specifically models PW4074D, PW4077D, PW4084D, PW4090, and PW4090-3. It mandates inspections and possible replacement of high-pressure compressor (HPC) drum rotor disk assemblies due to incorrect shot peening discovered on some parts. This directive aims to ensure continued airworthiness and safety of affected turbine engines.

Airworthiness Directive
  • Pratt & Whitney PW4070
  • Pratt & Whitney PW4080
  • Pratt & Whitney PW4090

EASA AD US-2023-22-02

Nov 22, 2023

Engine - Combustion Section Outer Diffuser Case - Inspection / Removal

Airworthiness Directive 2023-22-02 is a final rule issued by the FAA addressing Pratt & Whitney Division Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines. The directive focuses on inspecting and replacing the combustion section outer diffuser case (ODC) to prevent cracks that could lead to engine and aircraft damage. It mandates fluorescent penetrant inspections and replacement of certain ODC parts with modified versions to reduce stress-related cracking.

Airworthiness Directive
  • Pratt & Whitney PW4070
  • Pratt & Whitney PW4080
  • Pratt & Whitney PW4090

EASA AD US-2023-19-02

Oct 13, 2023

Low Pressure Compressor Fan Hub - Inspection / Replacement

Airworthiness Directive 2023-19-02 is a final rule issued by the FAA addressing Pratt & Whitney Division Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines. It mandates repetitive eddy current inspections of the low-pressure compressor (LPC) fan hub assembly to detect cracks and requires removal from service if cracks are found. This directive aims to prevent LPC fan hub failure that could lead to uncontained debris release and damage to the engine and aircraft.

Airworthiness Directive
  • Pratt & Whitney PW4070
  • Pratt & Whitney PW4080
  • Pratt & Whitney PW4090

EASA AD US-2022-07-13

Apr 20, 2022

Engine Oil - Air/Oil Heat Exchanger - Inspection / Replacement

The Federal Aviation Administration's Airworthiness Directive 2022-07-13 addresses Pratt & Whitney Division turbofan engines models PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3. This directive mandates inspection and possible replacement of the air/oil heat exchanger due to corrosion-related leaks that have caused in-flight shutdowns, particularly affecting Boeing 777 aircraft powered by these engines.

Airworthiness Directive
  • Pratt & Whitney PW4070
  • Pratt & Whitney PW4080
  • Pratt & Whitney PW4090
  • Boeing 777

EASA AD US-2022-06-09

Mar 14, 2022

Engine - 1st-Stage Low-Pressure Compressor Blades - Inspection / Removal

Airworthiness Directive 2022-06-09 is a final rule issued by the Federal Aviation Administration addressing certain Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines. It mandates inspections and removal of 1st-stage low-pressure compressor blades to prevent in-flight failures and engine fires. This directive updates previous ADs by requiring improved ultrasonic and thermal acoustic image inspections on critical blade locations.

Airworthiness Directive
  • Pratt & Whitney PW4070
  • Pratt & Whitney PW4080
  • Pratt & Whitney PW4090

EASA AD US-2021-05-51

Mar 10, 2021

Superseded by FAA AD 2022-06-09

FAA Airworthiness Directive 2021-05-51 is a final rule addressing certain Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines. It requires inspections of 1st-stage low-pressure compressor (LPC) blades due to an in-flight blade failure that caused an engine fire on a PW4077 engine. The directive aims to prevent blade release, engine damage, and potential airplane damage.

Airworthiness Directive
  • Pratt & Whitney PW4070
  • Pratt & Whitney PW4080
  • Pratt & Whitney PW4090

EASA AD US-2019-03-01

Feb 18, 2019

Superseded by FAA AD 2022-06-09

FAA Airworthiness Directive 2019-03-01 is a final rule addressing certain Pratt & Whitney PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines equipped with specific 1st-stage low-pressure compressor (LPC) blades. The directive mandates thermal acoustic imaging inspections to detect cracks and requires removal of blades that fail inspection to prevent unsafe conditions. This AD aims to enhance safety by preventing uncontained blade failures that could damage the engine and aircraft.

Airworthiness Directive
  • Pratt & Whitney PW4070
  • Pratt & Whitney PW4080
  • Pratt & Whitney PW4090

EASA AD US-2018-21-11

Nov 14, 2018

Superseded by FAA AD 2023-19-02

FAA Airworthiness Directive 2018-21-11 is a final rule addressing Pratt & Whitney PW4074D, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines equipped with low-pressure compressor (LPC) fan hubs, part numbers 51B821 or 52B521. The directive mandates repetitive eddy current and fluorescent penetrant inspections to detect cracks in these LPC fan hubs to prevent premature failure. This AD aims to enhance safety by mitigating the risk of uncontained fan hub release and subsequent engine or aircraft damage.

Airworthiness Directive
  • Pratt & Whitney PW4070
  • Pratt & Whitney PW4080
  • Pratt & Whitney PW4090

EASA AD US-2018-02-10

Jan 24, 2018

Superseded by FAA AD 2023-22-02

The Federal Aviation Administration Airworthiness Directive 2018-02-10 is a final rule addressing Pratt & Whitney Division PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines. It mandates inspections to detect cracks in the outer diffuser case and requires removal from service of any cases that fail inspection to ensure continued airworthiness and safety.

Airworthiness Directive
  • Pratt & Whitney PW4070
  • Pratt & Whitney PW4080
  • Pratt & Whitney PW4090