Airworthiness directives › 2000-03-02
AD 2000-03-02 Airworthiness Directives; General Electric Company GE90 Series Turbofan Engines
Applicability*9
General Electric Company (GE) GE90-90B, -85B, and -76B series turbofan engines, with fan mid shafts, part numbers (P/Ns) 1767M71G01, 1767M71G02, and 1767M75G02, installed. These engines are installed on but not limited to Boeing 777 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 (c) 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 fan mid shaft failure, which could result in a total loss of thrust and inflight engine shutdown, accomplish the following: Reduced Life Limits (a) Remove from service fan mid shafts and replace with serviceable parts prior to the following new, lower cyclic life limits: (1) For fan mid shafts, P/N 1767M71G01, installed on GE90-85B and -90B series engines, the new life limit is 4,200 cycles-since-new (CSN). (2) For fan mid shafts, P/N 1767M71G02, installed on GE90-85B and -90B series engines, the new life limit is 4,200 CSN. (3) For fan mid shafts, P/N 1767M75G02, installed on GE90-76B, -85B, and -90B series engines, the new life limit is 8,200 CSN. (b) This AD establishes new life limits for fan mid shafts, P/N 1767M71G01, 1767M71G02, and 1767M75G02. Except as provided in paragraph (c) of this AD, no alternate life limits for these affected parts may be approved. Alternative Methods of Compliance (c) 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. (d) This amendment becomes effective on April 7, 2000. Issued in Burlington, Massachusetts, on February 1, 2000. David A. Downey, Assistant Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 00-2686 Filed 2-4-00; 8:45 am] BILLING CODE 4910-13-U
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