95-14-09: Fuel Crossflow Tube

95-14-09 LEARJET: Amendment 39-9303. Docket 95-NM-119-AD. Applicability: Model 60 airplanes having serial numbers 60-001 through 60-058 inclusive, certificated in any category. NOTE 1: This AD applies to each airplane 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 airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must use the authority provided in paragraph (c) of this AD to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition; or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any airplane from the applicability of this AD. Compliance: Required as indicated, unless accomplished previously. To prevent loss of fuel from one fuel tank during normal operating conditions or loss of fuel from both main fuel tanks during fuel cross feeding operations, due to chafing and eventual failure of the fuel crossflow tube, accomplish the following: (a) Within 10 hours time-in-service after the effective date of this AD, perform a visual inspection to detect bends in or damage to the fuel crossflow tube, and perform an inspection to determine whether the clearance between the fuel crossflow tube and the flight control cables is at least 0.150 inch; in accordance with Learjet Alert Service Bulletin SB A60-28-3, dated May 12, 1995. (1) If the tube is not found to be bent or damaged, and a minimum clearance of 0.150 inch exists, no further action is required by this AD. (2) If the tube is not foundto be bent or damaged, and a minimum clearance of 0.150 inch does not exist, within 10 hours time-in-service after the effective date of this AD, replace the tube with a new tube in accordance with either paragraph (a)(2)(i) or (a)(2)(ii) of this AD, as applicable. Prior to further flight following replacement of the tube, perform an inspection to determine whether the clearance between the fuel crossflow tube and the flight control cables is at least 0.150 inch, in accordance with Learjet Alert Service Bulletin SB A60-28-3, dated May 12, 1995. (i) For airplanes having serial numbers 60-001 through 60-055, inclusive: Replace the fuel crossflow tube with a new tube in accordance with Learjet Service Bulletin SB 60-28-4, dated May 12, 1995. (ii) For airplanes having serial number 60-056 through 60-058, inclusive: Replace the fuel crossflow tube with a new tube in accordance with paragraph 2.B. of Learjet Alert Service Bulletin SB A60-28-3, dated May 12, 1995. (3)If the tube is found to be bent or damaged, prior to further flight, replace the tube with a new tube in accordance with either paragraph (a)(3)(i) or (a)(3)(ii) of this AD, as applicable. Prior to further flight following replacement of the tube, perform an inspection to determine whether the clearance between the fuel crossflow tube and the flight control cables is at least 0.150 inch, in accordance with Learjet Alert Service Bulletin SB A60-28-3, dated May 12, 1995. (i) For airplanes having serial numbers 60-001 through 60-055, inclusive: Replace the fuel crossflow tube with a new tube in accordance with Learjet Service Bulletin SB 60-28-4, dated May 12, 1995. (ii) For airplanes having serial number 60-056 through 60-058, inclusive: Replace the fuel crossflow tube with a new tube in accordance with paragraph 2.B. of Learjet Alert Service Bulletin SB A60-28-3, dated May 12, 1995. (b) If a minimum clearance of 0.150 inch does not exist on the new fuel crossflow tube that was installed in accordance with the requirements of paragraph (a) of this AD, prior to further flight, repair in accordance with a method approved by the Manager, Wichita Aircraft Certification Office (ACO), FAA, Small Airplane Directorate. (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, Wichita ACO. 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. (d) 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.(e) The inspections and certain replacements shall be done in accordance with Learjet Alert Service Bulletin SB A60-28-3, dated May 12, 1995; and certain other replacements shall be done in accordance with Learjet Service Bulletin SB 60-28-4, dated May 12, 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, P.O. Box 7707, Wichita, Kansas 67277-7707. 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-Continent Airport, Wichita, Kansas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on August 3, 1995.