Engine – High Pressure Turbine – 1st and 2nd-Stage Disks Suspected Material Defect - Replacement
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of PW307A and PW307D engines must remove and replace affected HPT disks listed in the directive by 31 January 2027 or at the next engine disassembly opportunity if listed in secondary tables. After the effective date, affected disks identified by part and serial numbers are prohibited from reinstallation. Compliance must follow the instructions in P&WC Service Bulletin PW300-72-47256 Revision 1 or later approved revisions.
Summary
Canadian Airworthiness Directive CF-2026-44 addresses suspected material defects in the high pressure turbine (HPT) 1st and 2nd-stage disks of Pratt & Whitney Canada PW307A and PW307D engines. This directive mandates replacement of specific affected HPT disks to prevent uncontained disk failure that could lead to engine and aircraft damage. The directive applies to engines installed on aircraft such as the Airbus A321-231 powered by these engines.
What changed
CF-2026-44 supersedes AD CF-2023-30 and requires compliance with P&WC Service Bulletin PW300-72-47256 Revision 1, dated 9 June 2026. The updated service bulletin mandates replacement of affected HPT disks with serviceable parts according to the Illustrated Parts Catalogue, preventing installation of unapproved disk configurations allowed under the previous version. It also expands the list of affected disk part numbers and serial numbers subject to removal and replacement.
Why it matters
This directive is critical for aviation professionals to mitigate the risk of uncontained HPT disk failures caused by subsurface material defects. Operators and maintenance organizations must ensure timely replacement of affected parts to maintain engine integrity and flight safety. Compliance avoids potential in-flight engine damage and costly unscheduled maintenance or accidents.
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