AD 98-13-21 Airworthiness Directives; Rolls-Royce Limited, Aero Division- Bristol, S.N.E.C.M.A Olympus 593 Series Turbojet Engines

Makes named: concorde. Read the applicability below — it usually turns on serial or part numbers too.

Rolls-Royce Limited (R-R), Aero Division-Bristol, S.N.E.C.M.A. Olympus 593 Mk. 610-14-28 turbojet engines, installed on but not limited to British Aerospace/Aerospatiale Concorde series aircraft. Note 1: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (d) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Required as indicated, unless accomplished previously. To prevent low pressure (LP) shaft signal system failure, which could result in an LP turbine overspeed, burst, uncontained engine failure, and damage to the aircraft in the event of a LP shaft failure, accomplish the following: (a) Perform initial and repetitive visual inspections of the LP shaft signal system rear cable for wear, and refurbish the LP shaft signal system, if necessary, in accordance with R-R Service Bulletin (SB) No. OL.593-76-9039-71, Revision 2, dated July 23, 1997, as follows: (1) Within 30 cycles in service after the effective date of this AD, perform the initial in-service inspection. (2) Thereafter, inspect at intervals not to exceed 800 hours time in service (TIS) since last inspection or refurbishment, whichever occurs first. (3) If rear cable wear is detected beyond the limits described in the SB, refurbish the LP shaft signal system. Note 2: Guidance on performing the initial in-service inspection can be found in the Maintenance Manual (76-21-01, 76-21-02), and guidance on performing a refurbishment of the LP shaft signal system can be found in the Overhaul Manual. (b) Refurbish the LP shaft signal system as follows: (1) Perform the initial refurbishment at the next engine shop visit after the effective date of this AD. (2) Thereafter, refurbish at intervals not to exceed each engine shop visit, or 200 hours TIS since last refurbishment, whichever occurs later. (c) For the purpose of this AD, an engine shop visit is defined as an engine entering the shop for work in accordance with the refurbishment or repair workscope. A maintenance related task would not be considered a shop visit. (d) 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. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. Note 3: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office. (e) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the aircraft to a location where the requirements of this AD can be accomplished. (f) The actions required by this AD shall be performed in accordance with the following R-R SB: ------------------------------------------------------------------------ Document No. Pages Revision Date ------------------------------------------------------------------------ OL.593-76-9039-71............. 1-5 2 July 23, 1997. Total pages: 5. ------------------------------------------------------------------------ [[Page 34580]] This incorporation by 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 Rolls-Royce, PO Box 3, Filton, Bristol BS12 7QE, England; telephone 01-17-979-1234, fax 01-17-979- 7575. Copies may be inspected at the FAA, New England Region, Office of the Regional 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. (g) This amendment becomes effective on July 10, 1998. Issued in Burlington, Massachusetts, on June 12, 1998. Jay J. Pardee, Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 98-16467 Filed 6-24-98; 8:45 am] BILLING CODE 4910-13-U