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Airworthiness directives › 2020-13-06

AD 2020-13-06 Airworthiness Directives; Pratt & Whitney Canada Corp. Turboprop Engines

2020-08-06
2020-07-02
39-21151
FAA-2019-0395
Engine
—

Applicability*9

This AD applies to Pratt & Whitney Canada Corp. (P&WC) PW150A model turboprop engines with a high-pressure (HP) centrifugal impeller, part number (P/N) 3049127-01, installed.

Compliance

Comply with this AD within the compliance times specified, unless already done.

Required actions

Remove HP centrifugal impeller, P/N 3049127-01, with any serial number (S/N) listed in Table 2 of P&WC Service Bulletin (SB) No. PW150-72-35331, Revision No. 1, dated May 3, 2016, prior to accumulating 8,000 flight cycles since new or within 150 flight cycles after the effective date of this AD, whichever occurs later, and replace with a part eligible for installation.

Unsafe condition

This AD was prompted by a determination by the manufacturer that certain HP centrifugal impellers installed on P&WC PW150A model turboprop engines may exhibit a material microstructure anomaly that has a potential to adversely affect the low cycle fatigue characteristics of the part. The FAA is issuing this AD to prevent failure of a certain HP centrifugal impeller. The unsafe condition, if not addressed, could result in uncontained release of the HP centrifugal impeller, damage to the engine, and damage to the airplane.

Affected ADs

None.

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