Engine — Transfer Gearbox Module Scavenge Screens — Inspection / Modification
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect the Transfer Gearbox scavenge screens within 50 flight hours after 11 May 2022 and repeat inspections every 50 flight hours until the engine is modified. If metallic particles are found, corrective actions must be taken as specified in the service bulletin. Engines must be modified during the next qualified engine shop visit to terminate repetitive inspections. Installation of affected parts and multiple Group 1 engines on the same aircraft is prohibited from the effective date.
Summary
EASA Airworthiness Directive 2022-0074 is an airworthiness directive addressing the inspection and modification of Transfer Gearbox Module scavenge screens on CFM International LEAP-1B series engines. These engines are installed on Boeing 737-8, 737-9, and 737-8200 aircraft. The directive mandates inspections for metallic particles and requires modifications to affected engines to prevent engine in-flight shutdowns caused by radial drive shaft bearing cage failures.
What changed
This new directive introduces repetitive inspections of the Transfer Gearbox scavenge screens for metallic particles on Group 1 LEAP-1B engines and requires modification of these engines during the next qualified engine shop visit. It also prohibits installation of affected parts and restricts installation of multiple Group 1 engines on the same aircraft. The directive supersedes previous ADs related to bearing cage failures by adding additional inspection and modification requirements.
Why it matters
This directive is critical for aviation professionals to prevent engine failures caused by radial drive shaft bearing cage issues, which have led to in-flight engine shutdowns. Operators and maintenance organizations must comply to ensure continued airworthiness and safety of Boeing 737 aircraft equipped with LEAP-1B engines. Compliance helps avoid unscheduled maintenance and potential safety risks associated with engine oil system contamination.
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New ADs and bulletins for CFM International LEAP-1B, Boeing 737-8, Boeing 737-9 and Boeing 737-8200, summarized like this page, every Monday.