96-03-01 R1 BOEING: Amendment 39-9538. Docket 95-NM-276-AD. Revises AD 96-03-01, Amendment 39-9496. \n\n\tApplicability: Model 747 series airplanes, as listed in Boeing Alert Service Bulletin 747- 71A2277, dated November 29, 1995; 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) of this AD 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 changedconfiguration 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 prevent separation of the engine from the airplane, accomplish the following: \n\n\t(a)\tWithin 90 days after the effective date of this AD, accomplish the requirements of paragraphs (a)(1) and (a)(2) of this AD in accordance with Boeing Alert Service Bulletin 747-71A2277, dated November 29, 1995. \n\n\t\t(1)\tPerform a visual inspection to ensure that installation of the tangential link upper bolt nut is on the forward side of the engine mount fitting.\n \n\t\t\t(i)\tIf the tangential link upper bolt nut is installed on the forward side of the engine mount fitting, repeat the visual inspection at intervals not to exceed 18 months. \n\n\t\t\t(ii)\tIf the tangential link upper bolt nut is not installed on the forward side of the enginemount fitting, prior to further flight, remove the nut, bolt, and washers and reinstall the nut, bolt, and washers in accordance with the alert service bulletin. Thereafter, repeat the visual inspection at intervals not to exceed 18 months. \n\n\t\t\t(iii)\tIf the tangential link upper bolt is missing from the engine mount fitting, prior to further flight, perform the various follow-on actions in accordance with the alert service bulletin. (The follow-on actions include visual inspections, magnetic particle inspections, replacement of the lower engine mount fitting with a serviceable part, if necessary; installation of new safety links, bolts, and nuts; and installation of a new tangential link upper bolt.) Thereafter, repeat the visual inspection at intervals not to exceed 18 months. \n\n\t\t(2)\tPerform an inspection to verify that the torque value of the tangential link upper bolt (on both sides of the mount) is within the limits specified in the alert service bulletin.\n \n\t\t\t(i)\tIf the torque value of the tangential link upper bolt nut is within the limits specified in the alert service bulletin, repeat the inspection (verification) at intervals not to exceed 18 months. \n\n\t\t\t(ii)\tIf the torque value of the tangential link upper bolt nut is outside the limits specified in the alert service bulletin, prior to further flight, perform a visual inspection of the tangential link upper bolt and washer for any damage or discrepancy, in accordance with the alert service bulletin. \n\n\t\t\t\t(A)\tIf no damage or discrepancy of the tangential link upper bolt and washers is found, prior to further flight, replace the bolt nut with a new or serviceable part in accordance with the alert service bulletin. Thereafter, repeat the inspection (verification) specified in paragraph (a)(2) of this AD at intervals not to exceed 18 months. \n\n\t\t\t\t(B)\tIf any damage or discrepancy of the tangential link upper bolt and washers is found, prior to further flight, replace the damaged or discrepant part with a new or serviceable part, and replace the bolt nut with a new or serviceable part, in accordance with the alert service bulletin. Thereafter, repeat the inspection (verification) specified in paragraph (a)(2) of this AD at intervals not to exceed 18 months. \n\n\t(b)\tReplacement of the safety links with modified safety links in accordance with Boeing Service Bulletin 747-71-2206, dated April 16, 1987; or Boeing Service Bulletin 747-71- 2206, Revision 1, dated November 12, 1987, as revised by Boeing Notice of Status Change No. 747-71-2206 NSC 1, dated December 4, 1987, and Boeing Notice of Status Change No. 747-71- 2206 NSC 2, dated March 17, 1988; constitutes terminating action for the repetitive inspection requirements of this AD.\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 2: 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 inspections, replacement, and follow-on actions shall be done in accordance with Boeing Alert Service Bulletin 747-71A2277, dated November 29, 1995. 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, as of February 16, 1996 (61 FR 3550, February 1, 1996). 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 is effective on February 16, 1996.