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PROPOSED AD THE BOEING COMPANY: Docket No. FAA-2019-0480; Product Identifier 2019-NM-041-AD.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this AD action by August 9, 2019.

(b) AFFECTED ADS

    This AD replaces AD 2013-07-09, Amendment 39-17413 (78 FR 22178, April
    15, 2013) ("AD 2013-07-09").

(c) APPLICABILITY

    This AD applies to all  The Boeing Company airplanes, certificated  in
    any category, as identified  in paragraphs (c)(1), (c)(2),  and (c)(3)
    of this AD.

(1) Model 737-700, -700C, -800, and -900ER series airplanes.

(2) Model 747-400F series airplanes.

(3) Model 767-200 and -300 series airplanes.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 35, Oxygen.

(e) UNSAFE CONDITION

    This AD was  prompted by reports  indicating that certain  crew oxygen
    mask stowage  box units  were possibly  delivered with  a burr  in the
    inlet fitting. The  burr might break  loose during test  or operation,
    and might pose an ignition source  or cause an inlet valve to  jam. We
    are issuing this  AD to address  this possible ignition  source, which
    could result in an  oxygen-fed fire; or an  inlet valve jam in  a crew
    oxygen mask stowage box unit, which could result in restricted flow of
    oxygen.

(f) COMPLIANCE

    Comply  with this  AD within  the compliance  times specified,  unless
    already done.

(g) RETAINED INSPECTION AND CORRECTIVE ACTION, WITH NO CHANGES

    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 identi-
    fied 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  identi-
    fied 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.

(h) RETAINED PARTS INSTALLATION PROHIBITION, WITH NO CHANGES

    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.

(i) NEW INSPECTION AND CORRECTIVE ACTION

    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, 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  identi-
    fied 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  identi-
    fied 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.

(j) NEW PARTS INSTALLATION PROHIBITION

    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  listed in  the
    Appendix of Intertechnique Service Bulletin MXP1/4-35-175, Revision 2,
    dated May 10, 2011, on any airplane.

(k) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The  Manager,  Seattle ACO Branch,  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
    certification  office,  send  it  to  the  attention  of  the   person
    identified in paragraph (l)(1) of this AD.  Information may be emailed
    to: 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov.

(2) Before using any approved AMOC,  notify your appropriate principal in-
    spector, or lacking  a principal inspector,  the manager of  the local
    flight standards district office/certificate holding district office.

(3) An AMOC  that  provides  an acceptable level of safety may be used for
    any repair, modification, or alteration  required by this AD if  it is
    approved by the  Boeing Commercial Airplanes  Organization Designation
    Authorization (ODA) that has  been authorized by the  Manager, Seattle
    ACO Branch, FAA,  to make those  findings. To be  approved, the repair
    method, modification deviation, or alteration deviation must meet  the
    certification  basis   of  the   airplane,  and   the  approval   must
    specifically refer to this AD.

(4) AMOCs approved previously  for AD 2013-07-09 are approved as AMOCs for
    the corresponding provisions of this AD.

(l) RELATED INFORMATION

(1) For more information about this AD, contact Susan L. Monroe, Aerospace
    Engineer, Cabin Safety and Environmental Systems Section, FAA, Seattle
    ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax:
    206-231-3570; email: susan.l.monroe@faa.gov.

(2) For  service  information  identified  in  this  AD,   contact  Boeing
    Commercial Airplanes,  Attention:  Contractual & Data Services (C&DS),
    2600 Westminster Blvd.,  MC 110-SK57, Seal Beach, CA 90740-5600; tele-
    phone 562-797-1717;  internet https://www.myboeingfleet.com.  You  may
    view  this  referenced  service  information  at  the  FAA,  Transport
    Standards Branch, 2200 South 216th St, Des Moines, WA. For information
    on the availability of this material at the FAA, call 206-231-3195.

Issued in Des Moines, Washington, on June 12, 2019. Michael Kaszycki, Act-
ing Director, System Oversight Division, Aircraft Certification Service.

DATES:The FAA must receive comments on this proposed AD by August 9, 2019.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2019-0480; Product Identifier 2019-NM-041-AD]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD)
2013-07-09, which applies 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
requires a general visual inspection for affected serial numbers of the
crew oxygen mask stowage box units, and replacement or re-
identification as necessary. Since the FAA issued AD 2013-07-09, the
agency has determined that the affected parts may be installed on
airplanes outside the original applicability of AD 2013-07-09. This
proposed AD would retain the requirements of AD 2013-07-09 and expand
the applicability to include those other airplanes. The FAA is
proposing this AD to address the unsafe condition on these products.

DATES: The FAA must receive comments on this proposed AD by August 9,
2019.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:

Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the
instructions for submitting comments.

Fax: 202-493-2251.

Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.

Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.

For service information identified in this NPRM, contact Boeing
Commercial Airplanes, Attention: Contractual & Data Services (C&DS),
2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-5600;
telephone 562-797-1717; internet https://www.myboeingfleet.com. You may
view this service information at the FAA, Transport Standards Branch,
2200 South 216th St., Des Moines, WA. For information on the
availability of this material at the FAA, call 206-231-3195. It is also
available on the internet at http://www.regulations.gov by searching
for and locating Docket No. FAA-2019-0480.

Examining the AD Docket

You may examine the AD docket on the internet at http://www.regulations.
gov by searching for and locating Docket No. FAA-2019-0480;
or in person at Docket Operations between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays. The AD docket contains
this NPRM, the regulatory evaluation, any comments received, and other
information. The street address for Docket Operations is listed above.
Comments will be available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: For more information about this AD,
contact Susan L. Monroe, Aerospace Engineer, Cabin Safety and
Environmental Systems Section, FAA, Seattle ACO Branch, 2200 South
216th St., Des Moines, WA 98198; phone and fax: 206-231-3570; email:
susan.l.monroe@faa.gov.

SUPPLEMENTARY INFORMATION:

Comments Invited

The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under the ADDRESSES section. Include "Docket No. FAA-2019-0480;
Product Identifier 2019-NM-041-AD" at the beginning of your comments.
The agency specifically invites comments on the overall regulatory,
economic, environmental, and energy aspects of this NPRM. The agency
will consider all comments received by the closing date and may amend
this NPRM because of those comments.

The FAA will post all comments we receive, without change, to
http://www.regulations.gov, including any personal information you
provide. The agency will also post a report summarizing each
substantive verbal contact received about this proposed AD.

Discussion

The FAA issued AD 2013-07-09, Amendment 39-17413 (78 FR 22178,
April 15, 2013) ("AD 2013-07-09"), for 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 requires a general visual inspection for affected serial
numbers of the crew oxygen mask stowage box units, and replacement or
re-identification as necessary. AD 2013-07-09 resulted from reports
indicating that certain crew oxygen mask stowage box units were possibly
delivered with a burr in the inlet fitting. The burr might break loose
during test or operation, and might pose an ignition source or cause an
inlet valve to jam. The FAA issued AD 2013-07-09 to address this possible
ignition source, which could result in an oxygen-fed fire; or an inlet
valve jam in a crew oxygen mask stowage box unit, which could result in
restricted flow of oxygen.

Actions Since AD 2013-07-09 Was Issued

Since the FAA issued AD 2013-07-09, it has been determined that the
affected parts may be installed as rotable spares on airplanes outside
of the applicability of AD 2013-07-09, thereby subjecting those
airplanes to the unsafe condition. Therefore, the applicability in this
proposed AD has been expanded to include all 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.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Boeing Alert Service Bulletin 737-35A1121,
Revision 1, dated November 7, 2011; Boeing Alert Service Bulletin 747-
35A2126, Revision 1, dated September 29, 2011; Boeing Alert Service
Bulletin 767-35A0057, Revision 1, dated November 17, 2011; and
Intertechnique Service Bulletin MXP1/4-35-175, Revision 2, dated May
10, 2011; which the Director of the Federal Register approved for
incorporation by reference as of May 20, 2013 (78 FR 22178, April 15,
2013). This service information is reasonably available because the
interested parties have access to it through their normal course of
business or by the means identified in the ADDRESSES section.

FAA's Determination

The FAA is proposing this AD because the FAA evaluated all the
relevant information and determined the unsafe condition described
previously is likely to exist or develop in other products of these
same type designs.

Proposed AD Requirements

This proposed AD would retain all requirements of AD 2013-07-09,
and expand the applicability to include all 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. This
proposed AD would require accomplishing the actions specified in the
service information specified previously.

Costs of Compliance

The FAA estimates that this proposed AD affects 2,140 airplanes of
U.S. registry. The agency estimates the following costs to comply with
this proposed AD:

Estimated Costs

Action
Labor cost
Parts cost
Cost per product
Cost on U.S. operators
Inspection (retained action from AD 2013-07-09) (40 airplanes) 1 work-hour x $85 per hour = $85
$0
$85
$3,400
Inspection (new action) (2,100 airplanes) 1 work-hour x $85 per hour = $85
0
85
178,500

The FAA has received no definitive data that would enable the
agency to provide cost estimates for the on-condition actions specified
in this proposed AD.

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, Section 106, describes the
authority of the FAA Administrator. Subtitle VII, Aviation Programs,
describes in more detail the scope of the Agency's authority.

The FAA is issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701, "General
requirements." Under that section, Congress charges the FAA with
promoting safe flight of civil aircraft in air commerce by prescribing
regulations for practices, methods, and procedures the Administrator
finds necessary for safety in air commerce. This regulation is within
the scope of that authority because it addresses an unsafe condition
that is likely to exist or develop on products identified in this
rulemaking action.

This proposed AD is issued in accordance with authority delegated
by the Executive Director, Aircraft Certification Service, as
authorized by FAA Order 8000.51C. In accordance with that order,
issuance of ADs is normally a function of the Compliance and
Airworthiness Division, but during this transition period, the
Executive Director has delegated the authority to issue ADs applicable
to transport category airplanes and associated appliances to the
Director of the System Oversight Division.

Regulatory Findings

The FAA has determined that this proposed AD would not have
federalism implications under Executive Order 13132. This proposed AD
would not have a substantial direct effect on the States, on the
relationship between the national Government and the States, or on the
distribution of power and responsibilities among the various levels of
government.

For the reasons discussed above, I certify that the proposed
regulation:

(1) Is not a "significant regulatory action" under Executive
Order 12866,

(2) Will not affect intrastate aviation in Alaska, and

(3) Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

The Proposed Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec. 39.13 [Amended]

2. The FAA amends Sec. 39.13 by removing Airworthiness Directive (AD)
2013-07-09, Amendment 39-17413 (78 FR 22178, April 15, 2013), and adding
the following new AD: