Engine – Rotating Air High Pressure Turbine Front Seal – Replacement
Superseded. Comply with 2019-0150, which replaces this document.
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must replace the identified rotating air HPT front seals within the compliance times specified in the directive, which vary by engine model and engine cycles since re-installation. They must also avoid operating aircraft with two engines equipped with affected parts exceeding specified engine cycle limits and must not install affected parts on any engine from the effective date. Compliance deadlines range from immediate to within several thousand engine cycles depending on the engine type.
Summary
EASA Airworthiness Directive 2019-0146 is an airworthiness directive addressing certain CFM56-5B, CFM56-5C, and CFM56-7B engines installed on aircraft including Airbus A318, A319, A320, A321, A340 and Boeing 737-600, 737-700, 737-800, and 737-900. The directive focuses on the replacement of rotating air high pressure turbine (HPT) front seals that are susceptible to cracking if removed and re-installed on different HPT disks. It mandates specific inspections and replacements to ensure continued airworthiness and safe operation of affected engines.
What changed
EASA Airworthiness Directive 2019-0146 introduces mandatory replacement of affected rotating air HPT front seals with serviceable parts within defined compliance times based on engine model and usage. It prohibits re-installation of affected parts on any engine and sets operational limitations on aircraft with engines equipped with affected parts beyond certain engine cycle thresholds. This AD is a new regulation addressing a specific unsafe condition related to seal cracking.
Why it matters
This directive is critical for aviation professionals as it addresses a potential unsafe condition that could lead to engine in-flight shutdown and reduced aircraft control. Operators and maintenance organizations must ensure compliance to avoid safety risks and regulatory violations. The AD impacts maintenance planning, parts inventory management, and operational scheduling due to the replacement and inspection requirements.
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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