[Federal Register: April 15, 1998 (Volume 63, Number 72)] [Rules and Regulations] [Page 18307-18308] From the Federal Register Online via GPO Access [wais.access.gpo.gov] [DOCID:fr15ap98-2] ======================================================================= ----------------------------------------------------------------------- DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. 97-NM-267-AD; Amendment 39-10284; AD 98-02-02] RIN 2120-AA64 Airworthiness Directives; Boeing Model 747 Series Airplanes Equipped With Pratt & Whitney JT9D-3 and -7 Series Engines AGENCY: Federal Aviation Administration, DOT. ACTION: Final rule; correction. ----------------------------------------------------------------------- SUMMARY: This document corrects erroneous references that appeared in airworthiness directive (AD) 98-02-02 that was published in the Federal Register on January 16, 1998 (63 FR 2593). The erroneous references resulted in incorrect citations of AD numbers. That AD is applicable to certain Boeing Model 747 series airplanes. It supersedes an existing AD to continue to require repetitive inspections for discrepancies of the forward engine mount bulkhead of the nacelle strut, and corrective actions, if necessary. That AD also continues to provide for an optional terminating action for the repetitive inspections. For certain airplanes, the AD adds various inspections to detect discrepancies in the forward engine mount bulkhead and chord, and in the forward lower spar web, and corrective actions, if necessary. The AD also adds an additional optional terminating action for the repetitive inspections. DATES: Effective February 2, 1998. The incorporation by reference of certain publications listed in the regulations was previously approved by the Director of the Federal Register as of February 2, 1998 (63 FR 2593, January 16, 1998). FOR FURTHER INFORMATION CONTACT: Tamara L. Anderson, Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Transport Airplane Directorate, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 227-2771; fax (425) 227-1181. SUPPLEMENTARY INFORMATION: Airworthiness Directive (AD) 98-02-02, amendment 39-10284, applicable to certain Boeing Model 747 series airplanes, was published in the Federal [[Page 18308]] Register on January 16, 1998 (63 FR 2593). That AD supersedes AD 82-22- 02, amendment 39-4476 (47 FR 46842, October 21, 1982), to continue to require repetitive inspections for discrepancies of the forward engine mount bulkhead of the nacelle strut, and corrective action, if necessary. That AD also continues to provide for an optional terminating action for the repetitive inspections. For certain airplanes, that AD adds various repetitive inspections to detect discrepancies (i.e., cracks, damage, loose fasteners) in the forward engine mount bulkhead and in the forward lower spar web, and corrective actions, if necessary. For other airplanes, that AD adds a one-time inspection to detect stop drilled cracks of the exterior of the forward engine mount chord, and replacement of the chord with a new chord, if necessary. That AD also adds an additional optional terminating action for the repetitive inspections. As published, AD 98-02-02 contained two erroneous references to previously issued AD's, one in paragraph (a) of the AD and the other in paragraph (b). Paragraph (a) of that AD identified the affected airplanes as, ``For airplanes on which the terminating action specified in AD 80-03-09 * * *.'' However, the correct AD number should have been specified as 80-03-09 R1. Paragraph (b) of that AD identified the affected airplanes as, ``For airplanes on which only loose fasteners have been replaced as required by telegraphic AD T79-NW-21, amendment 39-3687.'' Paragraph (b) is a restatement of a NOTE specified in AD 82- 22-02. The NOTE did not reference ``amendment 39-3687,'' therefore, paragraph (b) should not reference it either. Since no other part of the regulatory information has been changed, the final rule is not being republished. The effective of this AD remains February 2, 1998. Sec. 39.13 [Corrected] On page 2595, in the first column, paragraph (a) of AD 98-02-02 is corrected to read as follows: * * * * * (a) For airplanes on which the terminating action specified in AD 80-03-09 R1, amendment 39-3832, has been accomplished: Within 300 hours time-in-service after October 27, 1982 (the effective date of 82-22-02, amendment 39-4476), accomplish paragraphs (a)(1), (a)(2), and (a)(3) of this AD. Repeat the inspections thereafter at intervals not to exceed 4,000 flight hours, until accomplishment of the inspections required by paragraphs (c)(1) and (c)(2) of this AD or the terminating action specified in paragraph (e) of this AD. * * * * * On page 2595, in the second column, paragraph (b) of AD 98-02-02 is corrected to read as follows: * * * * * (b) For airplanes on which only loose fasteners have been replaced as required by telegraphic AD T79-NW-21: Within 600 hours time-in- service after October 27, 1982, replace all fasteners in both rows of fasteners with new fasteners in accordance with one of the service bulletins listed below: Boeing Alert Service Bulletin 747-54A2069, Revision 2, dated February 1, 1980; Boeing Alert Service Bulletin 747-54A2069, Revision 3, dated May 23, 1980; Boeing Alert Service Bulletin 747-54A2069, Revision 4, dated November 26, 1980; Boeing Service Bulletin 747-54A2069, Revision 5, dated August 21, 1981; Boeing Alert Service Bulletin 747-54A2069, Revision 6, dated October 22, 1982; Boeing Service Bulletin 747-54A2069, Revision 7, dated July 28, 1988; Boeing Service Bulletin 747-54A2069, Revision 8, dated June 9, 1994; or Boeing Alert Service Bulletin 747-54A2069, Revision 9, dated May 29, 1997. * * * * * Issued in Renton, Washington, on April 8, 1998. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 98-9876 Filed 4-14-98; 8:45 am] BILLING CODE 4910-13-U