92-22-15: PRATT & WHITNEY CANADA Model JT15D-5A Engines

92-22-15 PRATT & WHITNEY CANADA: Priority Letter issued on October 21, 1992. Docket No. 92- ANE-48. 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 high temperature deterioration of the flow divider start valve diaphragm that can result in uncommanded engine shutdowns with the inability to restart the engine, accomplish the following: (a) Modify flow divider start valve PWC Part Number 3038429 in accordance with the Accomplishment Instructions of PWC Service Bulletin No. 7371, dated October 14, 1992, before accumulating more than 50 hours time in service after receipt of this Priority Letter AD, or prior to December 1, 1992, whichever occurs first. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by theManager, 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. (c) 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. (d) Copies of the applicable service information may be obtained from Pratt & Whitney Canada, 1000 Marie-Victorin, Longueuil, Quebec, Canada J4G 1A1. This information may be examined at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Burlington, Massachusetts. (e) Priority Letter AD 92-22-15, issued October 21, 1992, becomes effective upon receipt.