AD 96-19-17 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 757-24A0079, dated August 8, 1996; 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 (b) 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 interruptions of electrical power during flight, which could result in loss of battery power to the source of standby power for the airplane, accomplish the following: (a) Within 45 days after the effective date of this AD, accomplish the actions specified in paragraphs (a)(1), (a)(2) and (a)(3) of this AD, in accordance with Boeing Alert Service Bulletin 757-24A0079, dated August 8, 1996. (1) Perform an inspection of the main battery shunt, to detect any contaminated fasteners, missing pressure washers or washers having an incorrect part number, or damage to terminal posts or to the plastic base. If any discrepancy is found, prior to further flight, replace the main battery shunt, in accordance with the alert service bulletin. (2) Perform an inspection of the wires, washers, and brass jam nuts to detect any contamination or damage. If any discrepancy is found, prior to further flight, replace the discrepant part with a serviceable part, in accordance with the alert service bulletin. (3) Inspect the torque and electrical resistance of the installation of the main battery ground stud, and adjust the torque and resistance of the ground stud, in accordance with the alert service bulletin. (b) 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. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO. (c) 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. (d) The actions shall be done in accordance with Boeing Alert Service Bulletin 757-24A0079, dated August 8, 1996. This incorporation by reference was approved by the Director of the Federal Register in [[Page 49411]] 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. (e) This amendment becomes effective on October 7, 1996. Issued in Renton, Washington, on September 11, 1996. James V. Devany, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 96-23851 Filed 9-19-96; 8:45 am] BILLING CODE 4910-13-P