Engine – Transfer Gearbox Module Scavenge Screens – Inspection
Superseded. Comply with 2020-0055, which replaces this document.
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform initial and repetitive inspections of the transfer gearbox module scavenge screens according to the specified flight hour intervals based on engine group classification. If metallic particles are detected, they must determine the particle type and take corrective actions within three calendar days or before the next flight as required. Compliance deadlines include initial inspections before exceeding 250 or 100 flight hours depending on engine group, with ongoing inspections at intervals not exceeding 250 or 100 flight hours respectively.
Summary
EASA Airworthiness Directive 2019-0137 is an airworthiness directive addressing CFM International LEAP-1B engines installed on Boeing 737-8 and 737-9 aircraft. It mandates repetitive inspections of the transfer gearbox module scavenge screens for metallic particles due to potential failure of the radial drive shaft bearing cage. The directive aims to prevent in-flight engine shutdowns caused by this failure.
What changed
EASA Airworthiness Directive 2019-0137 introduces mandatory inspection requirements for affected radial drive shaft bearings in LEAP-1B engines. It specifies inspection intervals based on engine serial numbers and flight hours, and outlines corrective actions if metallic particles are found. This AD does not supersede any previous directives but is itself superseded by EASA AD 2020-0055.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk that could lead to engine in-flight shutdowns, potentially compromising aircraft control. Operators and maintenance organizations must comply to ensure continued airworthiness and avoid operational disruptions. Compliance helps maintain safety standards and regulatory adherence for affected Boeing 737 aircraft equipped with LEAP-1B engines.
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New ADs and bulletins for CFM International LEAP-1B, Boeing 737-8 and Boeing 737-9, summarized like this page, every Monday.