Engine – Rotating Air High Pressure Turbine Front Seal – Replacement
Superseded. Comply with 2020-0007, which replaces this document.
- Published
- Effective
- Deadline
- Replaces
- 2019-0146
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must identify if their engines have affected rotating air HPT front seals and replace them with serviceable parts within the specified compliance times, which vary by engine model and seal condition. From the effective date, installation of affected parts is prohibited unless they are new or have not been re-installed on a different HPT disc. Compliance deadlines include replacement within up to 6,500 engine cycles since re-installation for CFM56-5B and CFM56-7B engines, and within 4,000 engine cycles for CFM56-5C engines.
Summary
EASA Airworthiness Directive 2019-0150 is an airworthiness directive addressing certain CFM International CFM56-5B, CFM56-5C, and CFM56-7B engines installed on various Airbus A318, A319, A320, A321, A340 and Boeing 737-600, 737-700, 737-800, and 737-900 aircraft. The directive mandates replacement of specific rotating air high pressure turbine (HPT) front seals identified by part numbers 1795M36P01 and 1795M36P02 due to risk of cracks leading to uncontained engine failure. It provides detailed affected serial numbers and compliance requirements for operators and maintenance organizations.
What changed
EASA Airworthiness Directive 2019-0150 supersedes AD 2019-0146 and redefines affected and serviceable parts, includes references to applicable Engine Shop Manual life limits, and provides a comprehensive list of affected serial numbers. It retains the original replacement requirements but clarifies installation prohibitions and compliance timelines based on engine model and seal condition. The directive also incorporates operator feedback to refine compliance instructions.
Why it matters
This directive is critical for aviation professionals to prevent uncontained engine failures caused by cracked HPT front seals, which could compromise aircraft safety and control. Operators and maintenance teams must ensure affected parts are replaced within specified engine cycles to maintain airworthiness. Compliance with this AD is mandatory to avoid operational restrictions and ensure continued safe operation of affected aircraft fleets.
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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