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Airworthiness directives › 2004-20-16

AD 2004-20-16 Airworthiness Directives; Boeing Model 747-200B, -200C, -200F, -300, -400, -400D, and -400F Series Airplanes; and Model 747SP Series Airplanes

2004-11-17
2004-10-13
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Airframe
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Models named: 747-200B, -200C, -200F, -300, -400, -400D, -400F series, 747SP series. Read the applicability below — it usually turns on serial or part numbers too.

Applicability*9

Model 747-200B, -200C, -200F, -300, -400, -400D, and -400F series airplanes; and Model 747SP series airplanes; as listed in Boeing Alert Service Bulletin 747-26A2274, Revision 1, dated January 9, 2003; certificated in any category.

Compliance

Required as indicated, unless accomplished previously. To prevent mineral build-up on the auxiliary power unit (APU) and engine fire shutoff switches, which could lead to failure of the switches to discharge fire suppressant in the affected area and could result in an uncontrolled fire that could spread to the strut, wing, or aft body of the airplane, accomplish the following: Service Bulletin Reference (a) The term “service bulletin,” as used in this AD, means the Accomplishment Instructions of Boeing Alert Service Bulletin 747-26A2274, Revision 1, dated January 9, 2003. Initial and Repetitive Functional Test (b) At the later of the compliance times specified in paragraphs (b)(1) and (b)(2) of this AD, perform 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. Fire Shutoff Switch Failure (c) If any fire shutoff switch fails during any functional test required by paragraph (b) or (f) 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. Replacement (d) Within 36 months after the effective date of this AD, replace all APU and engine fire shutoff switches that have not been previously replaced per paragraph (c) 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. Deactivation of Lucas Humidifier (e) Operators may terminate the repetitive requirements of paragraphs (b), (c), and (d) of this AD by accomplishing the actions in paragraphs (e)(1) and (e)(2) of this AD, except as provided by paragraph (f) 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 (e)(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 (f) For any airplanes on which Lucas humidifier, P/N M01AA0101, M01AB0101, M01AB0102, or M01AB0103 is reactivated after the effective date of this AD: Do the requirements of paragraphs (f)(1) and (f)(2) of this AD at the times specified in those paragraphs. (1) Within 18 months after reactivating the humidifier, and thereafter at intervals not to exceed 18 months, do the functional test required by paragraph (b) 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 per paragraph (c) of this AD. Do the replacements per paragraph (d) of this AD. Actions Accomplished Per Previous Issue of Service Bulletin (g) Unless otherwise specified in this AD, actions accomplished before the effective date of this AD per Boeing Alert Service Bulletin 747-26A2274, dated August 29, 2002, are considered acceptable for compliance with the corresponding action specified in this AD. Alternative Methods of Compliance (h) In accordance with 14 CFR 39.19, the Manager, Seattle Aircraft Certification Office, FAA, is authorized to approve alternative methods of compliance for this AD. Incorporation by Reference (i) The actions shall be done in accordance with Boeing Alert Service Bulletin 747-26A2274, Revision 1, dated January 9, 2003. 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 Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; 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. Effective Date (j) This amendment becomes effective on November 17, 2004. Issued in Renton, Washington, on September 30, 2004. Kevin M. Mullin, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 04-22563 Filed 10-12-04; 8:45 am] BILLING CODE 4910-13-P

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