91-13-10 R1 BOEING: Amendment 39-8158. Docket No. 91-NM-241-AD. Revises AD 91-13-10, Amendment 39- 7041. \n\n\tApplicability: Model 747 series airplanes equipped with Pratt and Whitney PW4000 engines; and Model 767 series airplanes equipped with Pratt and Whitney PW4000, General Electric CF6-80C2-B2F, or General Electric CF6- 80C2-B6F series engines; certificated in any category. \n\n\tCompliance: Required as indicated, unless previously accomplished. \n\tTo prevent overspeed or uncommanded shutdown of an engine, accomplish the following:\n\n\t(a)\tFor Model 747 series airplanes equipped with Pratt and Whitney PW4000 engines, and Model 767 series airplanes equipped with Pratt and Whitney PW4000 or General Electric CF6-80C2-B6F engines: Within 3 days after May 22, 1989 (the effective date of Amendment 39-6210), add the following to the Limitations Section of the FAA- approved Airplane Flight Manual (AFM). This may be accomplished by inserting a copy of this AD in the AFM. \n\n\t"Prior to each departure, with all engines running, refer to the EICAS status page and determine the dispatch capability of the aircraft." \n\n\t(b)\tWithin the next 24 months after August 12, 1991 (the effective date of this Amendment 39-7041), replace the EICAS computers in accordance with the appropriate service bulletin listed below. After replacement of the EICAS computers in accordance with the specified service bulletins, the AFM limitation required by paragraph (a) of this AD may be removed. \n\n\t\t(1)\tFor Model 747 series airplanes listed in Boeing Service Bulletin 747-31-2151, dated March 29, 1990. \n\n\t\t(2)\tFor Model 767 series airplanes equipped with Pratt and Whitney PW4000 engines listed in Boeing Service Bulletin 767-31-0033, Revision 1, dated September 27, 1990. \n\n\t\t(3)\tFor Model 767 series airplanes equipped with General Electric CF6-80C2-B6F engines listed in Boeing Service Bulletin 767-31-0038, dated April 12, 1990. \n\n\t(c)\tFor Model 767 series airplanes equipped with General Electric CF6-80C2-B2F engines: \n\n\t\t(1)\tWithin the next 3 days after the effective date of this AD, add the following to the Limitations Section of the FAA-approved Airplane Flight Manual (AFM). This may be accomplished by inserting a copy of this AD in the AFM. \n\n\t"Prior to each departure, with all engines running, refer to the EICAS status page and determine the dispatch capability of the aircraft." \n\n\t\t(2)\tWithin the next 24 months after the effective date of this AD, replace the EICAS computers in accordance with Boeing Service Bulletin 767-31-0038, dated April 12, 1990. After incorporation of the EICAS computers, the AFM limitation required by paragraph (c)(1) may be removed. \n\n\t(d)\tFor airplanes not subject to paragraph (b) or (c) of this AD, within the next 30 days after the effective date of this AD, remove the AFM limitation required by paragraph (a) of this AD. \n\n\t(e)\tAn alternative method of compliance or adjustment of the compliance time, which provides anacceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. \n\n\tNOTE: The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Seattle ACO. \n\n\t(f)\tSpecial flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. \n\n\t(g)\tThe replacement requirements shall be done in accordance with the following Boeing Service Bulletins, which incorporate the following list of affected pages: \n\nService Bulletin\tRevision Level\t\tDate\t\t\tPages \n\n747-31-2151\nOriginal\t\nMarch 29, 1990\n1 - 10 \n767-31-0033\n1\nOriginal\t\nSeptember 27, 1990 May 31, 1990\n1, 2, 4, 5 \n3, 6, 7, 8, \n9, 10 \n767-31-0038\nOriginal\t\nApril 12, 1990\n1 - 8 \n\n\n\n\n\t\nThis incorporation by reference was approved by the Director of the Federal Register inaccordance 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. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington; or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, D.C.\n\n\t(h)\tAirworthiness Directive 91-13-10 superseded AD 89-10-06, Amendment 39-6210. \n\t(i)\tThis Airworthiness Directive 91-13-10 R1 revises AD 91-13-10, Amendment 39-7041.\n \t(j)\tThis amendment (39-8158, AD 91-13-10 R1) becomes effective on February 26, 1992.