Engine — High-Pressure Stage 2 Compressor Stator Seal and Rotor Seal Teeth — In-Shop Inspection
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators and maintenance providers must perform the in-shop inspection of the high-pressure stage 2 compressor stator seals and rotor seal teeth according to CFM Service Bulletin LEAP-1B-72-00-0394-01A-930A-D issue 002. This inspection must be completed before the engine exceeds 2,900 cycles since new or within 10 engine flight cycles after December 11, 2024, whichever occurs later. Depending on inspection results, replacement of the stator seals and stage 3-4 blisk may be required.
Summary
EASA Airworthiness Directive 2024-0227 is an airworthiness directive addressing certain CFM International LEAP-1B engine models installed on Boeing 737-8, 737-8200, and 737-9 aircraft. The directive mandates in-shop inspections of the high-pressure stage 2 compressor stator seals and rotor seal teeth to detect manufacturing defects that could lead to damage and reduced aircraft control. This AD applies specifically to engines with certain serial numbers and requires compliance by December 11, 2024.
What changed
EASA Airworthiness Directive 2024-0227 introduces a new mandatory in-shop inspection requirement for the high-pressure stage 2 compressor stator seals and stage 3-4 blisk seal teeth on affected LEAP-1B engines. This AD is a new regulation that requires inspections before exceeding 2,900 engine cycles since new or within 10 engine flight cycles after the effective date, whichever is later. It also mandates replacement of parts depending on inspection findings.
Why it matters
This directive is critical for aviation professionals because it addresses a potential unsafe condition that could lead to high-energy debris release and consequent damage to the aircraft. Operators and maintenance organizations must ensure compliance to maintain aircraft airworthiness and safety. The inspections and possible part replacements will help prevent engine damage and maintain operational control, reducing the risk of in-flight incidents.
More for CFM International LEAP-1B
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- EASA AD 2025-0003Engine — Low Pressure Turbine — Stage 4 and Stage 5 Disks — ReplacementJan 7, 2025
- EASA AD 2024-0226Engine — High-Pressure Compressor Stages 6-10 Spools and High-Pressure Turbine Rotor Stage 1 Disks — ReplacementNov 26, 2024
- EASA AD 2023-0109
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