96-18-01: Aft Core Cowl Nozzle of Engine Nacelles

96-18-01 LEARJET: Amendment 39-9725. Docket 95-NM-240-AD. Applicability: Model 60 airplanes, as listed in Learjet Service Bulletin SB 60-71-2, dated May 12, 1995; certificated in any category. NOTE 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 request approval for an alternative method of compliance in accordance with paragraph (b) 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, unlessaccomplished previously. To prevent the sealant material in the aft core cowl nozzle of the engine nacelles from interfering with the lever of the emergency fuel shutoff actuating mechanism, which could result in the failure of the emergency fuel shutoff actuating mechanism and resultant engine shutdown, accomplish the following: (a) Within 90 days after the effective date of this AD, modify the aft core cowl nozzle of the engine nacelles in accordance with Learjet Service Bulletin SB 60-71-2, dated May 12, 1995. (b) 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, Wichita Aircraft Certification Office (ACO), FAA, Small 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, Wichita ACO. NOTE 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita ACO. (c) 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 airplane to a location where the requirements of this AD can be accomplished. (d) The modification shall be done in accordance with Learjet Service Bulletin SB 60-71-2, dated May 12, 1995, which includes Nordam Service Bulletin PW300L71-1, dated April 26, 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. Copies may be obtained from Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-2942. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Wichita Aircraft Certification Office, Small Airplane Directorate, 1801 Airport Road, Room 100, Mid-ContinentAirport, Wichita, Kansas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on October 2, 1996.