2006-08-13: Hydromechanical fuel control (HFC)

2006-08-13 Pratt & Whitney Canada: Amendment 39-14570. Docket No. FAA-2006-24117; Directorate Identifier 2006-NE-07-AD. Effective Date (a) This airworthiness directive (AD) becomes effective May 8, 2006. Affected ADs (b) None. Applicability (c) 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. Unsafe Condition (d) 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. Compliance (e) 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 Compliance (h) The Manager, Engine Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19. Related Information (i) Transport Canada airworthiness directive CF-2004-28, dated December 20, 2004, also addresses the subject of this AD. Material Incorporated by Reference (j) You must use Pratt & Whitney Canada Alert Service Bulletin No. PW500-72-A30257, Revision 1, dated December 3, 2004, to perform the actions required by this AD. The Director of the Federal Register approved the incorporation by reference of this service bulletin in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Pratt & Whitney Canada, 1000 Marie-Victorin, Longueuil, Quebec, Canada, J4G 1A1; telephone 800-268-8000; fax 450-647-2888, for a copy of this service information. You may review copies at the Docket Management Facility; U.S. Department of Transportation, 400 Seventh Street, SW., Nassif Building, Room PL- 401, Washington, DC 20590-0001, on the Internet at http://dms.dot.gov ; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/ federal-register/cfr/ibr-locations.html.