Airworthiness directives › 2010-17-01
AD 2010-17-01 Airworthiness Directives; Pratt & Whitney Canada Corp. PW617F-E Turbofan Engines
Applicability*9
This AD applies to Pratt & Whitney Canada Corp. PW617F-E turbofan engines with fuel/oil heat exchanger (FOHE) part number (P/N) 35C4540-01 installed. These engines are installed on, but not limited to, Empresa Brasileira de Aeronáutica S.A (EMB) 500 airplanes. Reason (d) This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: A PW617F-E engine powered twin engined aircraft had recently experienced an uncommanded power reduction on one of its engines. Investigation showed that the Fuel Filter Bypass Valve poppet in the FOHE on that engine had worn through the housing seat, allowing unfiltered fuel and debris to contaminate the Fuel Metering Unit, resulting in fuel flow drop and subsequent power reduction. Pratt & Whitney Canada Corp. issued an Alert Service Bulletin (ASB) No. PW600-72-A66019 to inspect and replace any discrepant valve with the same type new valve. The inspection results confirmed that failure of a worn through poppet is dormant and it can affect both engines at the same time that could result in an unsafe condition on PW617F-E powered aircraft. We are issuing this AD to prevent uncommanded power reduction, which could result in the inability to continue safe flight and safe landing.
Compliance
Unless already done, replace the FOHE fuel filter bypass poppet valve with a larger fuel filter bypass poppet valve within 25 hours of the effective date of the AD. Use paragraph 3.A. of the Accomplishment Instructions of Pratt & Whitney Canada Corp. ASB No. PW600-72-A66021, Revision 1, dated January 7, 2010, to do the replacement. Previous Credit (f) A fuel filter bypass poppet valve replacement performed before the effective date of this AD using Pratt & Whitney Canada Corp. ASB No. PW600-72-A66021, dated November 23, 2009, satisfies the replacement requirement of this AD. Alternative Methods of
Required actions
Unless already done, replace the FOHE fuel filter bypass poppet valve with a larger fuel filter bypass poppet valve within 25 hours of the effective date of the AD. Use paragraph 3.A. of the Accomplishment Instructions of Pratt & Whitney Canada Corp. ASB No. PW600-72-A66021, Revision 1, dated January 7, 2010, to do the replacement. Previous Credit (f) A fuel filter bypass poppet valve replacement performed before the effective date of this AD using Pratt & Whitney Canada Corp. ASB No. PW600-72-A66021, dated November 23, 2009, satisfies the replacement requirement of this AD. Alternative Methods of
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