Airworthiness directives › 98-26-07
AD 98-26-07 Airworthiness Directives; Rolls-Royce Limited, Bristol Engines Division, Viper Models Mk.521 and Mk.522 Turbojet Engines
Makes named: raytheon. Models named: MGBB.145, MGBB.168, DH.125 series, BH.125 series 400A. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
Rolls-Royce Limited, Bristol Engines Division, (R-R) Viper Model Mk.521 turbojet engine with high pressure (HP) fuel pump, part numbers (P/N's) MGBB.167 or MGBB.134 installed, and Model Mk 522 turbojet engine with HP fuel pump MGBB.137, MGBB.145, MGBB.168, or MGBB.169 installed. These engines are installed on but not limited to Raytheon (formerly British Aerospace, Hawker Siddeley) Model DH.125 series and BH.125 series 400A airplanes. 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 (c) 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.
Compliance
Required as indicated, unless accomplished previously. To prevent HP fuel pump failures, which can result in an in- flight engine shutdown accomplish the following: (a) Remove from service affected HP fuel pumps, and replace with serviceable HP fuel pumps, at the earliest of the following: prior to 160 hours time in service (TIS) after the effective date of this AD, at the next shop visit after the effective date of this AD, at the next HP fuel pump removal after the effective date of this AD, or prior to 18 months after the effective date of this AD, as follows: (1) For HP fuel pumps installed on R-R Viper Mk.521 engines, replace HP fuel pumps P/N MGBB.167 or MGBB.134 with serviceable fuel pump P/N MGBB.182, in accordance with R-R SB No. 73-A118, Revision 1, dated August 1997. (2) For HP fuel pumps installed on R-R Viper Mk.522 engines, replace HP fuel pumps P/Ns MGBB.137 or MGBB.145 with serviceable fuel pump MGBB.183, or HP fuel pump P/N's MGBB.168 or MGBB.169 with serviceable fuel pump P/N MGBB.184,in accordance with R-R SB No. 73- A115, Revision 2, dated August 1997. (b) For the purpose of this AD, a shop visit is defined as the induction of an engine into the shop for any reason, including, but not limited to, the installation of an engine on an aircraft. (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, 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, Certification Office. Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Certification Office. (d) 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 airplane to a location where the requirements of this AD can be accomplished. (e) The actions required by this AD shall be done in accordance with the following Rolls-Royce SB's: ---------------------------------------------------------------------------------------------------------------- Document No. Pages Revision Date ---------------------------------------------------------------------------------------------------------------- RR SB 73-A115....................................... 1-4 2 August 1997. Total pages: 4 RR SB 73-A118....................................... 1-4 1 August 1997. Total pages: 4 ---------------------------------------------------------------------------------------------------------------- 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 Limited, Bristol Engines Division, Technical Publications Department CLS-4, P.O. Box 3, Filton, Bristol, BS34 7QE England; telephone 117-979-1234, fax 117- 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. (f) This amendment becomes effective on February 16, 1998. Issued in Burlington, Massachusetts, on December 9, 1998. Jay J. Pardee, Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 98-33243 Filed 12-17-98; 8:45 am] BILLING CODE 4910-13-U
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1