Engine — Compressor Section — Impeller Fracture due to Machining Step
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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 inspection of the impeller back face at the next scheduled hot section inspection or when the flange C is separated, whichever occurs first, following P&WC SB JT15D-72-7655. If any cracks or unacceptable machining lines are found, the impeller must be replaced before further flight. The impeller must also be replaced at the next scheduled engine overhaul with a compliant part.
Summary
Canadian Airworthiness Directive CF-2022-27 addresses a safety issue in Pratt & Whitney Canada JT15D-1, JT15D-1A, and JT15D-1B engines with impeller part number 3020365 installed. The directive mandates inspection of the engine compressor impeller for fractures caused by machining steps that can lead to uncontained engine failure. This directive applies to engines built before Service Bulletin 7151 and requires corrective actions to prevent potential in-flight engine damage.
What changed
This new Airworthiness Directive introduces mandatory inspections of the compressor impeller's back face using a borescope fluorescent penetrant inspection procedure as specified in P&WC Service Bulletin JT15D-72-7655. It requires operators to inspect at the next hot section inspection or when certain engine components are separated and to replace the impeller if cracks or machining defects are found. Additionally, it mandates replacement of the affected impeller at the next scheduled engine overhaul.
Why it matters
This directive is critical for aviation professionals because it addresses a risk of impeller fracture that can cause uncontained engine failure, posing serious safety hazards. Operators and maintenance organizations must comply to ensure continued airworthiness and prevent costly in-flight engine damage. Compliance teams need to track inspections and replacements to meet regulatory requirements and maintain safe operations.
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