# AD 93-19-03: Flow Divider Start Salve Diaphragm - Type: Airworthiness directive - Status: Current - Products: Pratt & Whitney Canada JT15D-5A - Effective: October 12, 1993 - Supersedes: [AD 92-22-15](https://openairdocs.org/ad/92-22-15) - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-8696 - Docket: 93-ANE-59 - Registered aircraft: 480 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/37D8F75D9422EC3686256847005F9550.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/93-19-03 ## The airworthiness directive 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. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E25EA](https://openairdocs.org/tcds/E25EA): Pratt & Whitney Canada Corp.; names 1 of 13 models: JT15D-5A ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 480 (0 by airframe model, 480 by engine model) - Makers: Cessna 348, Raytheon 88, Beech 41, Air Tractor 1, Fly 716 1, Siai-Marchetti 1 Models with the most aircraft: - [Pratt & Whitney Canada JT15D 5 series](https://openairdocs.org/engine/pratt-whitney-canada-jt15d-5-series): 450 aircraft (engine model) - [Pratt & Whitney Canada JT15D-5A](https://openairdocs.org/engine/pratt-whitney-canada-jt15d-5a): 30 aircraft (engine model) All 2 models: https://openairdocs.org/ad/93-19-03/models.md Every aircraft: https://openairdocs.org/ad/93-19-03/aircraft.md ## Related documents - [AD 92-22-15](https://openairdocs.org/ad/92-22-15) (historical): Pratt & Whitney Canada JT15D-5A. Effective Oct 21, 1992. Replaced by this AD Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.