AD 2005-01-13 Airworthiness Directives; Boeing Model 767-300 Series Airplanes

Models named: 767-300 series. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Boeing Model 767-300 series airplanes, certificated in any category; as listed in Boeing Alert Service Bulletin 767-26A0127, dated July 17, 2003.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Service Bulletin Reference (f) The term “service bulletin,” as used in this AD, means the Accomplishment Instructions of Boeing Alert Service Bulletin 767-26A0127, dated July 17, 2003. Initial and Repetitive Functional Tests (g) At the later of the compliance times specified in paragraphs (g)(1) and (g)(2) of this AD, do a functional test of the APU and engine fire shutoff switches, in accordance with the service bulletin. Repeat the functional test thereafter at intervals not to exceed 18 months. (1) Within 18 months since the date of issuance of the original Airworthiness Certificate or the original Export Certificate of Airworthiness. (2) Within 90 days after the effective date of this AD. Corrective Action for Failure of a Fire Shutoff Switch (h) If any APU or engine fire shutoff switch fails during any functional test required by paragraph (g) or (k) of this AD, before further flight, replace the switch with a new or serviceable switch, in accordance with the service bulletin. Repeat the switch replacement thereafter at intervals not to exceed 36 months. Initial and Repetitive Replacements of Fire Shutoff Switches (i) Within 18 months after the effective date of this AD, replace all APU and engine fire shutoff switches that have not been previously replaced in accordance with paragraph (h) of this AD with new or serviceable switches, in accordance with the service bulletin. Repeat the switch replacement thereafter at intervals not to exceed 36 months. Optional Terminating Action: Deactivation of Humidifier (j) Accomplishment of the actions specified in paragraphs (j)(1) and (j)(2) of this AD, terminates the repetitive requirements of paragraphs (g), (h), and (i) of this AD, except as provided by paragraph (k) of this AD. (1) Deactivate the Lucas humidifier, part number (P/N) M01AA0101, M01AB0101, M01AB0102, or M01AB0103, in accordance with the service bulletin. (2) Before further flight following the deactivation specified in paragraph (j)(1) of this AD, replace all APU and engine fire shutoff switches with new or serviceable switches, in accordance with the service bulletin. Reactivation of Lucas Humidifier (k) For any airplane on which Lucas humidifier, P/N M01AA0101, M01AB0101, M01AB0102, or M01AB0103, is reactivated after the effective date of this AD: Do the actions required by paragraphs (k)(1) and (k)(2) of this AD at the specified compliance times. (1) Within 18 months after reactivating the humidifier, and thereafter at intervals not to exceed 18 months, do the functional tests required by paragraph (g) of this AD. (2) Within 36 months after reactivating the humidifier, and thereafter at intervals not to exceed 36 months, replace all APU and engine fire shutoff switches that have not been previously replaced in accordance with paragraph (h) of this AD. Do the replacements in accordance with paragraph (i) of this AD. Alternative Methods of Compliance (AMOC) (l) The Manager, Seattle Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Material Incorporated by Reference (m) You must use Boeing Alert Service Bulletin 767-26A0127, dated July 17, 2003, 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 this document in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. You can get copies of the document from Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207. You can review copies at the Docket Management Facility office, U.S. Department of Transportation, 400 Seventh Street SW, room PL-401, Nassif Building, Washington, DC; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, 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 December 29, 2004. Kevin M. Mullin, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 05-538 Filed 1-12-05; 8:45 am] BILLING CODE 4910-13-P

This AD was prompted by a report of the failure of the engine fire shutoff switch in the engine fire control module. The Federal Aviation Administration is issuing this AD to prevent mineral build-up on the auxiliary power unit (APU) and engine fire shutoff switches, which could lead to the switches failing to discharge fire suppressant to the affected fire zone and result in an uncontrolled engine or APU fire and consequent loss of the airplane.