Engine — High Pressure Turbine Rear Cover Life Limitation Reduction
- Published
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform a one-time review of engine records within 30 days of the directive's effective date to verify the total cycles on the HPT rear cover, following P&WC Service Bulletin 21942 or approved revisions. They must also replace the HPT rear cover before it exceeds the new cycle limits specified in the updated EMM Revision 38.3. Using later approved revisions of the Airworthiness Limitations section is acceptable for compliance.
Summary
Canadian Airworthiness Directive CF-2019-32 addresses the life limitation reduction of the High Pressure Turbine (HPT) rear cover on Pratt & Whitney Canada model PW127G engines. This directive mandates compliance with updated low cycle fatigue life values for specific HPT rear cover parts, identified as P/Ns 3039639 and 3078516-01. The directive aims to ensure continued airworthiness by preventing engine and potential aircraft damage due to part failure.
What changed
CF-2019-32 introduces a reduction in the approved life limits for the HPT rear cover components on PW127G engines based on updated fatigue analysis. It requires a one-time review of engine records to verify accumulated cycles and mandates replacement of the HPT rear cover before reaching the new cycle limits specified in the revised Engine Maintenance Manual (EMM) Revision 38.3. This is a new regulation addressing a shortfall in previously published life limits.
Why it matters
This directive is critical for operators and maintenance organizations to prevent engine damage and ensure flight safety by adhering to the revised life limits of the HPT rear cover. Compliance helps avoid unexpected part failures that could lead to costly repairs or safety incidents. Maintenance and compliance teams must update their records and maintenance planning to reflect the new limitations.
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