Engine – High-Pressure Turbine Inner Stationary Seal – Inspection
Superseded. Comply with 2024-0002, which replaces this document.
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect affected seals during the next engine shop visit after 17 March 2020 and replace any affected seals with non-affected ones. If honeycomb separation is found, additional corrective actions including replacement of rotating air HPT front seal, HPT rotor blades, and removal of the No. 3 ball bearing must be performed before engine release. Installation of affected seals is prohibited after compliance or from the effective date for unaffected engines.
Summary
EASA Airworthiness Directive 2020-0044 is an airworthiness directive issued by the European Union Aviation Safety Agency addressing certain CFM International CFM56-5B, CFM56-5C, and CFM56-7B engine models installed on Airbus A318, A319, A320, A321, A340, and Boeing 737 series aircraft. The directive mandates inspection and potential replacement of high-pressure turbine inner stationary seals to prevent damage caused by honeycomb separation. This directive aims to ensure continued airworthiness and safety of affected engines and aircraft.
What changed
EASA Airworthiness Directive 2020-0044 introduces a one-time in-shop inspection requirement for affected high-pressure turbine inner stationary seals on specified CFM56 engine models. It requires replacement of affected seals with non-affected ones and additional corrective actions if honeycomb separation is detected. The directive also prohibits installation of affected seals on any engine after compliance.
Why it matters
This directive is critical for aviation professionals as it addresses a potential unsafe condition that could lead to uncontained engine seal release and subsequent engine and aircraft damage. Operators and maintenance organizations must comply to maintain aircraft safety and regulatory compliance. Failure to comply could result in operational restrictions or safety risks.
More for CFM International CFM56-5B
All 9- EASA PAD 26-113Engine – High Pressure Turbine Front Seal – InspectionSep 23, 2026
- EASA AD 2026-0033Engine — High-Pressure Turbine Inner Stationary Seal — InspectionFeb 20, 2026
- EASA AD 2024-0067-EEngine — Life Limited Parts — ReplacementMar 9, 2024
- EASA AD 2024-0002Engine — High-Pressure Turbine Inner Stationary Seal — InspectionJan 4, 2024
- EASA AD 2021-0062Engine — Low Pressure Turbine Rear Frames — Inspection / ReplacementMar 5, 2021
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