AD 2007-07-02 Airworthiness Directives; Boeing Model 737-300, -400, -500, -600, -700, -800 and -900 Series Airplanes; and Model 757-200 and -300 Series Airplanes

Models named: 737-300, -400, -500, -600, -700, -800, -900 series, 757-200, -300 series. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Boeing Model 737-300, -400, -500, -600, -700, -800 and -900 series airplanes; and Model 757-200 and -300 series airplanes; certificated in any category; as identified in the applicable service bulletin in Table 1 of this AD. Table 1.—Service Bulletins Boeing special attention Service Bulletin Dated— Applicable to model/series— 737-25-1545 September 8, 2005 737-600, -700, -800, and -900. 737-25-1548 November 22, 2005 737-300, -400, and -500. 757-25-0284 November 22, 2005 757-200. 757-25-0285 November 22, 2005 757-300.

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 60 months after the effective date of this AD: Modify the activation mechanism in the chemical oxygen generator of each passenger service unit (PSU) by doing all the applicable actions specified in the Accomplishment Instructions of the applicable service bulletin specified in Table 1 of this AD. Alternative Methods of Compliance (AMOCs) (g)(1) The Manager, Seattle 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 (h) You must use the applicable service bulletin specified in Table 2 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 Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207 for a copy of this service information. You may review copies 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/cfr/ibr-locations.html . Table 2.—Material Incorporated by Reference Boeing special attention Service Bulletin Date 737-25-1545 September 8, 2005. 737-25-1548 November 22, 2005. 757-25-0284 November 22, 2005. 757-25-0285 November 22, 2005. Issued in Renton, Washington, on March 13, 2007. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7-5556 Filed 3-27-07; 8:45 am] BILLING CODE 4910-13-P

This AD results from several reports indicating that some chemical oxygen generators failed to activate during in-flight decompression events. These failures were due to fracture of components between the passenger oxygen mask and the release pin in the oxygen generator. We are issuing this AD to prevent failure of the activation mechanism of the chemical oxygen generator, which could result in the unavailability of supplemental oxygen and possible incapacitation of passengers and cabin crew during an in-flight decompression.