AD 2005-24-13 Airworthiness Directives; Learjet Model 45 Airplanes

Models named: 45. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Learjet Model 45 airplanes, certificated in any category; serial numbers (S/Ns) 45-005 through 45-273 inclusive, and 45-2001 through 45-2029 inclusive.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Modification (f) Within 50 flight hours after the effective date of this AD: Modify the electrical wire bundle for the alternator on the left-hand engine; and do a general visual inspection of the left and right engines to make sure that the proper clearances are maintained between all wiring harnesses and engine tubing. Correct improper clearances before further flight. Do all actions in accordance with the Accomplishment Instructions of the applicable service bulletin in paragraph (f)(1) or (f)(2) of this AD. (1) For Learjet Model 45 airplanes with S/Ns 45-2001 through 45-2029 inclusive: Bombardier Alert Service Bulletin SB A40-71-01, dated September 29, 2005. (2) For Learjet Model 45 airplanes with S/Ns 45-005 through 45-273 inclusive: Bombardier Alert Service Bulletin SB A45-71-4, dated September 29, 2005. Note 1: For the purposes of this AD, a general visual inspection is: “A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to ensure visual access to all surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.” Concurrent Requirement (g) For airplanes with S/Ns identified in paragraphs (g)(1) and (g)(2) of this AD: Before or concurrently with the modification required by paragraph (f) of this AD, replace the fuses for the hydraulic shutoff valves with fuses having higher amperage in accordance with the Accomplishment Instructions of the applicable service bulletin in paragraph (g)(1) or (g)(2) of this AD. (1) For Learjet Model 45 airplanes with S/Ns 45-2001 through 45-2015 inclusive: Bombardier Service Bulletin SB 40-24-01, dated April 22, 2005. (2) For Learjet Model 45 airplanes with S/Ns 45-005 through 45-254 inclusive: Bombardier Service Bulletin SB 45-24-6, dated April 22, 2005. No Reporting Requirement (h) Although Bombardier Alert Service Bulletin SB A40-71-01, dated September 29, 2005; and Bombardier Alert Service Bulletin SB A45-71-4, dated September 29, 2005; specify sending a compliance report to the manufacturer, this AD does not include that requirement. Alternative Methods of Compliance (AMOCs) (i)(1) The Manager, Wichita Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. (2) Before using any AMOC approved in accordance with § 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. Material Incorporated by Reference (j) You must use the service information listed in Table 1 of this AD to perform the actions that are required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approved the incorporation by reference of these documents in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-2942, for a copy of this service information. You may review copies at the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street SW., room PL-401, Nassif Building, Washington, DC; on the Internet at http://dms.dot.gov ; or at the National Archives and Records Administration (NARA). For information on the availability of this material at the NARA, call (202) 741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Table 1.—Material Incorporated by Reference Bombardier service bulletin Date Alert Service Bulletin SB A40-71-01 September 29, 2005. Alert Service Bulletin SB A45-71-4 September 29, 2005. Service Bulletin SB 40-24-01 April 22, 2005. Service Bulletin SB 45-24-6 April 22, 2005. Issued in Renton, Washington, on November 18, 2005. Kalene C. Yanamura, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 05-23510 Filed 12-2-05; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report of a fire in the left-hand engine nacelle. We are issuing this AD to prevent chafing between the wire bundle for the alternator on each engine and the hydraulic lines, which could result in a fire in the engine nacelle.