AD 2010-21-19 Airworthiness Directives; Learjet Inc. Model 45 Airplanes

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

This AD applies to Learjet Inc. Model 45 airplanes, certificated in any category; as identified in Bombardier Service Bulletins 40-26-05 and 45-26-9, both Revision 2, both dated May 4, 2009.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Replacement, Check, Inspection, Corrective Action (g) Within 12 months after the effective date of this AD: Replace the aluminum fire extinguisher discharge tubes with new, improved stainless steel tubes; check the fire extinguisher container for any serial number specified in Table 1 of Bombardier Service Bulletin 40-26-05 or 45-26-9, both Revision 2, both dated May 4, 2009, as applicable; replace any containers that have affected serial numbers, do a weight check of all containers, including the replacement container, if applicable; and inspect the pressure indicator on the containers for discrepancies; by doing all applicable actions in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 40-26-05 or 45-26-9, both Revision 2, both dated May 4, 2009; as applicable. If any discrepancy is found, replace the container before further flight in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 40-26-05 or 45-26-9, both Revision 2, both dated May 4, 2009; as applicable. (h) Actions done before the effective date of this AD in accordance with the applicable service information listed in Table 1 of this AD are acceptable for compliance with the corresponding requirements in paragraph (g) of this AD. Table 1—Credit for Actions Accomplished in Accordance With Previous Service Information Affected Serial Numbers— Bombardier Service Bulletin— Revision— Dated— For Model 45 airplanes having serial numbers 2001 through 2114, inclusive 40-26-05 Basic Issue November 24, 2008. For Model 45 airplanes having serial numbers 2001 through 2114, inclusive 40-26-05 1 December 22, 2008. For Model 45 airplanes having serial numbers 006 through 383, inclusive 45-26-9 Basic Issue November 24, 2008. For Model 45 airplanes having serial numbers 006 through 383, inclusive 45-26-9 1 December 22, 2008. 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 using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the ACO, send it to the attention of the person identified in the Related Information section of this AD. (2) Before using any approved AMOC, notify your Principal Maintenance Inspector or Principal Avionics Inspector, as appropriate, or lacking a principal inspector, your local Flight Standards District Office. Related Information (j) For more information about this AD, contact James Galstad, Aerospace Engineer, Systems and Propulsion Branch, ACE-116W, FAA, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209; telephone (316) 946-4135; fax (316) 946-4107; e-mail james.galstad@faa.gov. Material Incorporated by Reference (k) You must use the service information contained in Table 2 of this AD, as applicable, to do the actions required by this AD, unless the AD specifies otherwise. Table 2—Material Incorporated by Reference Document Revision Date Bombardier Service Bulletin 40-26-05 2 May 4, 2009. Bombardier Service Bulletin 45-26-9 2 May 4, 2009. (1) The Director of the Federal Register approved the incorporation by reference of the service information contained in Table 2 of this AD under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-2942; telephone 316-946-2000; fax 316-946-2220; e-mail ac.ict@aero.bombardier.com; Internet http://www.bombardier.com . (3) You may review copies of the service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington. For information on the availability of this material at the FAA, call 425-227-1221. (4) You may also review copies of the service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at an NARA facility, call 202-741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Issued in Renton, Washington, on October 5, 2010. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 2010-25599 Filed 10-13-10; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report of accidental discharge of a fire extinguisher container and damage to an aluminum discharge tube. Investigation revealed that following the discharge an inaccurate pressure indication, due to the indicator dial being incorrectly staked, showed that the container was fully charged. The Federal Aviation Administration is issuing this AD to prevent inaccurate pressure readings and subsequent damage to the discharge tubes during operation, which could result in failure of the fire extinguisher system and an uncontained fire in an emergency situation.