Airworthiness Directive · Amendment 39-21498 · Oxygen
The Boeing Company Airplanes
This AD applies to all The Boeing Company airplanes, certificated in any category, as identified in paragraphs (c)(1) through (5) of this AD.
(1) Model 737-200, -300, -400, -500, -600, -700, -700C, -800, -900, and -900ER series airplanes.
(2) Model 737-8 and 737-9 airplanes.
(3) Model 747-200B, 747-200C, 747-200F, 747-400, 747-400D, and 747-400F series airplanes.
(4) Model 757-200, -200PF, -200CB, and -300 series airplanes.
(5) Model 767-200, -300, -300F, and -400ER series airplanes.
The FAA is superseding Airworthiness Directive (AD) 2013-07- 09, which applied to certain The Boeing Company Model 737-700, -700C, - 800, and -900ER series airplanes, Model 747-400F series airplanes, and Model 767-200 and -300 series airplanes. AD 2013-07-09 required a general visual inspection for affected serial numbers of the crew oxygen mask stowage box units, and replacement or re-identification as necessary. This AD retains the requirements of AD 2013-07-09 and expands the applicability. This AD was prompted by a determination that the affected parts may be installed on airplanes outside the original applicability of AD 2013-07-09. The FAA is issuing this AD to address the unsafe condition on these products.
This paragraph restates the requirements of paragraph (g) of AD 2013-07-09 with no changes. For The Boeing Company Model 737 airplanes as identified in Boeing Alert Service Bulletin 737-35A1121, Revision 1, dated November 7, 2011; The Boeing Company Model 747 airplanes as identified in Boeing Alert Service Bulletin 747-35A2126, Revision 1, dated September 29, 2011; and The Boeing Company Model 767 airplanes as identified in Boeing Alert Service Bulletin 767-35A0057, Revision 1, dated November 17, 2011: Within 24 months after May 20, 2013 (the effective date of AD 2013-07-09), do a general visual inspection to determine if the serial number of the crew oxygen mask stowage box unit is identified in the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-35A1121, Revision 1, dated November 7, 2011; Boeing Alert Service Bulletin 747-35A2126, Revision 1, dated September 29, 2011; or Boeing Alert Service Bulletin 767-35A0057, Revision 1, dated November 17, 2011; as applicable. A review of airplane maintenance records is acceptable in lieu of this inspection if the serial number of the crew oxygen mask stowage box unit can be conclusively determined from that review.
(1) If any crew oxygen mask stowage box unit has a serial number identified in table 1 of the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011: Before further flight, replace the crew oxygen mask stowage box unit with a new or serviceable unit in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-35A1121, Revision 1, dated November 7, 2011; Boeing Alert Service Bulletin 747-35A2126, Revision 1, dated September 29, 2011; or Boeing Alert Service Bulletin 767-35A0057, Revision 1, dated November 17, 2011; as applicable.
(2) If any crew oxygen mask stowage box unit has a serial number identified in table 2 of the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011: Before further flight, add the letter “I” to the end of the serial number (identified as “SER”) on the identification label, in accordance with the Accomplishment Instructions of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011; and reinstall in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-35A1121, Revision 1, dated November 7, 2011; Boeing Alert Service Bulletin 747-35A2126, Revision 1, dated September 29, 2011; or Boeing Alert Service Bulletin 767-35A0057, Revision 1, dated November 17, 2011; as applicable.
(3) If no crew oxygen mask stowage box unit has a serial number identified in the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011: Unless a records review was done to determine the serial number, before further flight, reinstall the crew oxygen mask stowage box unit, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-35A1121, Revision 1, dated November 7, 2011; Boeing Alert Service Bulletin 747-35A2126, Revision 1, dated September 29, 2011; or Boeing Alert Service Bulletin 767-35A0057, Revision 1, dated November 17, 2011; as applicable.
This paragraph restates the requirements of paragraph (h) of AD 2013-07-09 with no changes. For airplanes identified in paragraph (g) of this AD: As of May 20, 2013 (the effective date of AD 2013-07-09), no person may install a crew oxygen mask stowage box unit with a serial number listed in the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011, on any airplane.
For airplanes other than those identified in paragraph (g) of this AD: Within 24 months after the effective date of this AD, do a general visual inspection to determine if the serial number of the crew oxygen mask stowage box unit is identified in the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011. A review of airplane maintenance records is acceptable in lieu of this inspection if the serial number of the crew oxygen mask stowage box unit can be conclusively determined from that review, or if it can be conclusively determined that the serial number is not one that is identified in the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011.
(1) If any crew oxygen mask stowage box unit has a serial number identified in table 1 of the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011, or the crew oxygen mask stowage box unit has a serial number that is unreadable or undetermined: Before further flight, replace the crew oxygen mask stowage box unit with a new or serviceable unit. If any crew oxygen mask stowage box unit's serial number is unreadable or undetermined, but the manufacturing date can conclusively be determined to be outside the range of July 2007 through November 2007 inclusive, the crew oxygen mask stowage box unit does not need to be replaced.
(2) If any crew oxygen mask stowage box unit has a serial number identified in table 2 of the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011: Before further flight, add the letter “I” to the end of the serial number (identified as “SER”) on the identification label, in accordance with the Accomplishment Instructions of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011; and reinstall the crew oxygen mask stowage box unit.
(1) For airplanes other than those identified in paragraph (g) of this AD: As of the effective date of this AD, no person may install a crew oxygen mask stowage box unit with a serial number identified in table 1 of the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011; or any crew oxygen mask stowage box unit with a serial number that is unreadable or undetermined unless the manufacturing date can conclusively be determined by a review of the airplane maintenance records to be outside the range of July 2007 through November 2007 inclusive.
(2) For airplanes other than those identified in paragraph (g) of this AD: As of the effective date of this AD, no person may install a crew oxygen mask stowage box unit with a serial number identified in table 2 of the Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May 10, 2011, on any airplane, unless that crew oxygen mask stowage box unit has been modified as required by paragraph (i)(2) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
