86-20-10: High Pressure Turbine Disks

86-20-10 ROLLS-ROYCE plc: Amendment 39-5415. Applies to Rolls-Royce Dart Mks., 506, 506F, 510, 510A, 511, 511-7E, 514, 514-7, and 515 turboprop engines. Compliance is required as indicated, unless already accomplished. To prevent cracking of high pressure turbine disks, install new or reworked oversize high pressure nozzle guide vane(s) in accordance with Rolls-Royce Dart (R-R) Service Bulletin (SB) Da72-451, Revision 5, dated June 1982, or FAA approved equivalent, by October 1, 1987. Aircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where the AD can be accomplished. Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Engine Certification Office, Aircraft Certification Division, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803. Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Engine Certification Office, New England Region, may adjust the compliance time specified in this AD. R-R SB Da72-451, Revision 5, dated June 1982, identified and described in this document, is incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer may obtain copies upon request to Rolls-Royce plc - East Kilbride, Attn: Dart Engine Service Manager, Glasgow G74-4PY, Scotland. This document may also be examined at the Office of the Regional Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, Room 311, Rules Docket Number 86-ANE-19, between the hours of 8:00 a.m. and 4:30 p.m., Monday through Friday, except Federal holidays. This amendment becomes effective on November 4, 1986.