AD 93-19-03

93-19-03 PRATT & WHITNEY CANADA: Amendment 39-8696. Docket 93-ANE-59. Applicability: Pratt & Whitney Canada (PWC) JT15D-5A turbofan engines installed on but not limited to Cessna Model 560 (Citation V) aircraft. Compliance: Required as indicated, unless accomplished previously. To prevent deterioration of the flow divider start valve diaphragm due to high temperature that can result in uncommanded engine shutdowns with the inability to restart the engine, accomplish the following: (a) Modify flow divider start valves, PWC Part Numbers 3037076 and 3038429, in accordance with the Accomplishment Instructions of PWC Service Bulletin (SB) No. JT15D-72-7371, dated October 14, 1992, before accumulating more than 50 hours time in service after the effective date of this AD, or prior to 40 days after the effective date of this AD, whichever occurs first. (b) No further action is required for engines that incorporate improved flow divider start valves in accordance with PWC SB No. JT15D-72-7372, Revision 1, dated November 20, 1992. (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Engine Certification Office. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. NOTE: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office. (d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the aircraft to a location where the requirements of this AD can be accomplished. (e) The modification shall be done in accordance with the following service bulletin:

Document No. Pages Date PWC SB No. JT15D-72-7371 1-5 October 14, 1992 Total pages: 5

This incorporationby reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Pratt & Whitney Canada, 1000 Marie-Victorin, Longueuil, Quebec, Canada J4G 1A1. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment supersedes priority letter AD 92-22-15, issued October 21, 1992. (g) This amendment becomes effective on October 12, 1993.