AD 98-26-04 Airworthiness Directives; Boeing Model 757 Series Airplanes

Models named: 757 series. Read the applicability below — it usually turns on serial or part numbers too.

Model 757 series airplanes, as listed in Boeing Alert Service Bulletin 757-28A0045, Revision 1, dated November 19, 1998; certificated in any category. Note 1: This AD applies to each airplane 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 airplanes 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)(1) 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 uncommanded fuel flow from the fuel tanks to the engine nacelle in the event of a leak in the engine fuel line or a fire in the engine nacelle, accomplish the following: Restatement of Requirements of AD 96-17-02 (a) For Model 757 series airplanes having line positions 478 through 699 inclusive: Within 60 days after August 28, 1996 (the effective date of AD 96-17-02, amendment 39-9710), perform an inspection to detect leakage of the fuel shutoff (spar) valves and verify that the valves do not leak when commanded to close, in accordance with Boeing Alert Service Bulletin 757-28A0045, dated July 30, 1996. (l) If both fuel shutoff valves pass the inspection for leakage and the valves close when commanded, no further action is required by this AD. (2) If either or both of the fuel shutoff valves do not pass the inspection for leakage: Prior to further flight, adjust the engine fuel shutoff valve(s) in accordance with Part III of the alert service bulletin and repeat the requirements of paragraph (a) of this AD. New Requirements of This AD (b) For Model 757 series airplanes, having line positions 700 through 710 inclusive, 712, 718, and 719: Within 60 days after the effective date of this AD, perform an inspection to detect leakage of the fuel shutoff (spar) valves and verify that the valves do not leak when commanded to close, in accordance with Boeing Alert Service Bulletin 757-28A0045, Revision 1, dated November 19, 1998. (l) If both fuel shutoff valves pass the inspection for leakage and the valves close when commanded, no further action is required by this AD. (2) If either or both of the fuel shutoff valves do not pass the inspection for leakage: Prior to further flight, adjust the engine fuel shutoff valve(s) in accordance with Part III of the alert service bulletin and repeat the requirements of paragraph (b) of this AD. (c)(1) 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, 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. (c)(2) Alternative methods of compliance, approved previously in accordance with AD 96-17-02, amendment 39-9710, are approved as alternative methods of compliance with this AD. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO. (d) Special flight permits may be issued in accordance with Secs. 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 inspection and adjustment shall be done in accordance with Boeing Alert Service Bulletin 757-28A0045, dated July 30, 1996, or Boeing Alert Service Bulletin 757-28A0045, Revision 1, dated November 19, 1998. (1) The incorporation by reference of Boeing Alert Service Bulletin 757-28A0045, Revision 1, dated November 19, 1998, is approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. (2) The incorporation by reference of Boeing Alert Service Bulletin 757-28A0045, dated July 30, 1996, was approved previously by the Director of the Federal Register as of August 28, 1996 (61 FR 41953, August 13, 1996). (3) 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. (f) This amendment becomes effective on December 31, 1998. Issued in Renton, Washington, on December 8, 1998. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 98-33104 Filed 12-15-98; 8:45 am] BILLING CODE 4910-13-U