Airworthiness directives › 2006-08-13
AD 2006-08-13 Airworthiness Directives; Pratt & Whitney Canada (PWC) PW535A Turboshaft Engines
Applicability*9
This AD applies to Pratt & Whitney Canada (PWC) PW535A engines with serial numbers lower than DC0241, and with hydromechanical fuel control (HFC) part number (P/N) 819735-4, 819735-5, or 819735-6 installed. These engine models are installed on, but not limited to, Cessna model 560 Citation (Encore) airplanes.
Compliance
You are responsible for having the actions required by this AD performed within 50 flight hours time-in-service after the effective date of this AD, unless the actions have already been done. (f) To ensure the HFC, P/N 819735-4, 819735-5, or 819735-6, ratio unit setscrew is properly adjusted, determine if the HFC serial number is listed in Table 1 of PWC Alert Service Bulletin (ASB) No. PW500-72-A30257, Revision 1, dated December 3, 2004. (1) If the HFC's serial number is listed in Table 1, ensure the HFC ratio unit setscrew is properly adjusted by following the instructions contained in paragraphs 3 B, C, D, E, F, G, and H of PWC ASB No. PW500-72-A30257, Revision 1, dated December 3, 2004. (2) If the HFC's serial number is not listed, this airworthiness directive is not applicable. Prior Credit (g) Compliance with the original version of PWC ASB No. PW500-72-A30257, dated December 2, 2003, before the effective date of this AD satisfies the requirements of this AD. Alternative Methods of
Unsafe condition
This AD results from incidents of PW535A engines experiencing lack of response to the power lever input during engine acceleration, due to an incorrect adjustment of the HFC ratio unit setscrew. We are issuing this AD to prevent lack of engine response to power lever input, which could cause a single or dual engine in-flight shutdown event.
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