95-21-08: Engine Fuel Valve Indication Circuits

95-21-08 BOEING: Amendment 39-9394. Docket 94-NM-133-AD. \n\n\tApplicability: Model 757 series airplanes equipped with Pratt & Whitney PW2000 engines, as listed in Boeing Service Bulletin 757-76-0010, dated August 12, 1993; and Model 757 series airplanes equipped with Rolls-Royce RB211-535 engines, as listed in Boeing Service Bulletin 757- 76-0011, dated December 2, 1993; certificated in any category. \n\n\tNOTE 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must use the authority provided in paragraph (c) to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition; or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any airplane from the applicability of this AD. \n\n\tCompliance: Required as indicated, unless accomplished previously. \n\n\tTo reduce false indications of engine fuel valve faults, accomplish the following: \n\n\t(a)\tFor airplanes equipped with Pratt & Whitney PW2000 engines: Within 6 months after the effective date of this AD, modify the engine fuel valve indication circuits in accordance with Boeing Service Bulletin 757-76-0010, dated August 12, 1993. \n\n\t(b)\tFor airplanes equipped with Rolls-Royce RB211-535 engines: Within 18 months after the effective date of this AD, accomplish the modifications specified in paragraphs (b)(1) and (b)(2) of this AD. The modification specified in paragraph (b)(1) must be accomplished either prior to or concurrently with the modification specified in paragraph (b)(2). In any case, both modifications must be completed within 18 months after the effective date of this AD. \n\n\t\t(1)\tModify the engine fuel shutoff valve control in accordance with Boeing Service Bulletin 757-76-0007, Revision 2, dated January 23, 1992. \n\n\tNOTE 2: Modification of the engine fuel shutoff valve control that was accomplished prior to the effective date of this AD in accordance with either Boeing Service Bulletin 757-76-0007 (original issue), dated February 22, 1990, or Revision 1, dated October 31, 1991, is considered acceptable for compliance with paragraph (b)(1) of this AD. \n\n\t\t(2)\tModify the engine fuel valve indication circuits in accordance with Boeing Service Bulletin 757-76-0011, dated December 2, 1993. \n\n\t(c)\tAn 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, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Seattle ACO. \n\n\tNOTE 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO. \n\n\t(d)\tSpecial 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. \n\n\t(e)\tThe modifications shall be done in accordance with Boeing Service Bulletin 757-76- 0010, dated August 12, 1993; Boeing Service Bulletin 757-76-0007, Revision 2, dated January 23, 1992; and Boeing Service Bulletin 757-76-0011, dated December 2, 1993. 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 Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124-2207. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. \n\n\t(f)\tThis amendment becomes effective on November 17, 1995.