98-19-10: Accessory Gearbox

98-19-10 CFM International: Amendment 39-10752 Docket 98-ANE-44-AD. Applicability: CFM International (CFMI) CFM56-3, -3B, and -3C series turbofan engines, having any of the engine serial numbers (ESNs) identified in Table 1 of CFMI CFM56-3/-3B/-3C Service Bulletin (SB) No. 72-877, Revision 1, dated June 15, 1998. These engines are installed on but not limited to Boeing 737 series aircraft. Note 1: This airworthiness directive (AD) applies to each engine 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 engines 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 (d) 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. Compliance: Required as indicated, unless accomplished previously. To prevent an accessory gearbox (AGB) starter gearshaft failure, which can result in an inflight engine shutdown, and on aircraft with two affected engines installed, possible dual inflight engine shutdown and forced landing, accomplish the following: (a) On aircraft with two affected engines installed, remove one affected engine from the aircraft, and replace with a serviceable engine not identified by ESN in Table 1 of CFMI CFM56-3/-3B/-3C SB No. 72-877, Revision 1, dated June 15, 1998, or replace the suspect starter gearshaft on one of the engines with a serviceable gearshaft, in accordance with the Accomplishment Instructions of CFMI CFM56-3/-3B/-3C SB No. 72-877, Revision 1, dated June 15, 1998; within 350 hours time in service (TIS) after the effective date of this AD, or by October 1, 1998, whichever occurs first. Thereafter, for the remaining engine, replace suspect starter gearshafts in accordance with paragraph (b) of this AD. (b) On aircraft with only one affected engine installed, remove the affected engine from the aircraft, and replace with a serviceable engine not identified by ESN in Table 1 of CFMI CFM56-3/-3B/-3C SB No. 72-877, Revision 1, dated June 15, 1998, or replace the suspect starter gearshaft with a serviceable gearshaft, in accordance with the Accomplishment Instructions of CFMI CFM56-3/-3B/-3C SB No. 72-877, Revision 1, dated June 15, 1998; within 2,100 hours TIS after the effective date of this AD, or by February 1, 1999, whichever occurs first. (c) Report within 5 working days of replacement of the starter gearshaft to the FAA if the ESN listed in Table 1 of CFMI CFM56-3/-3B/-3C SB No. 72-877, Revision 1, dated June 15, 1998, does not directly correspond to the adjoining starter gearshaft serial number to verify that all affected parts have been removed from service. Report to the Manager, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803-5299; Fax (781) 238-7199. Reporting requirements have been approved by the Office of Management and Budget and assigned OMB control number 2120-0056. (d) 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, Engine Certification Office. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office. (e) 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 aircraft to a location where the requirements of this AD can be accomplished. (f) The actions required by this AD shall be done in accordance with the following CFMI CFM56-3/-3B/-3C SB: Document No. Pages Revision Date 72-877 1-49 1 June 15, 1998 Total pages: 49. 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 CFM International, Technical Publications Department, 1 Neumann Way, Cincinnati, OH 45215; telephone (513) 552-2981, fax (513) 552-2816. Copies may be inspected at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (g) This amendment becomes effective on September 28, 1998.