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PROPOSED AD THE BOEING COMPANY: Docket No. FAA-2022-1479; Project Identifier AD-2022-00703-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments  on this airworthiness directive (AD) by
    January 23, 2023.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to all The Boeing Company Model 737-100, 737-200, 737-
    200C, 737-300, 737-400,  737-500, 737-600, 737-700, 737-700C, 737-800,
    737-900, 737-900ER,  757-200, 757-200PF, 757-200CB,  757-300, 767-200,
    767-300, 767-300F, and 767-400ER series airplanes, certificated in any
    category.

(d) SUBJECT

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

(e) UNSAFE CONDITION

    This AD was prompted by reports of premature aging of certain chemical
    oxygen  generators.  The  FAA  is  issuing  this  AD  to  address this
    premature aging that resulted  in the generators failing  to activate,
    which  could  fail to  deliver  oxygen during  an  emergency, possibly
    resulting in injury to the airplane occupants.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) OXYGEN GENERATOR PART NUMBER INSPECTION

    Within 30 days after the effective date of this AD:  Inspect passenger
    chemical oxygen generators  having part numbers  117080-02, 117080-03,
    and 117080-04  to determine  their date  of manufacture.  A review  of
    airplane  maintenance  records  is  acceptable  for  the   inspection,
    provided the  date of  manufacture can  be conclusively  determined by
    that review.

(h) DEFINITION

    For purposes of  this AD, a  serviceable unit is  a passenger chemical
    oxygen  generator  that  meets  the  condition  specified  in   either
    paragraph (h)(1) or (2) of this AD.

(1) Part numbers 117080-02, 117080-03, and 117080-04, with a manufacturing
    date not older than 10 years.

(2) Approved part numbers  other than 117080-02, 117080-03, and 117080-04,
    provided the generator has not exceeded the life limit established for
    that generator by the manufacturer.

(i) OXYGEN GENERATOR REPLACEMENT

    For  any  passenger  chemical oxygen  generators  having  part numbers
    117080-02, 117080-03, and 117080-04: At the applicable time  specified
    in  paragraph (i)(1)  through (3)  of this  AD,  replace  the chemical
    oxygen  generator with  a serviceable  unit,  as  defined in  this AD.
    Thereafter,  replace chemical  oxygen generators  having part  numbers
    117080-02, 117080-03,  and 117080-04  before exceeding  10 years since
    date of manufacture.

Note 1 to paragraph (i): Additional guidance  for  replacing  the affected
passenger chemical oxygen generators  can  be  found  in Collins Aerospace
Service Information Letter 117080-SIL-002, dated May 4, 2022, and approved
maintenance procedures.

(1) For passenger chemical oxygen generators  that have a date of manufac-
    ture in 2008 or earlier:  Replace within 6 months  after the effective
    date of this AD  or 15 years since the date of manufacture,  whichever
    occurs earlier.

(2) For passenger chemical oxygen generators  that have a date of manufac-
    ture in 2009 or 2010:  Replace  within  12 months  after the effective
    date of this AD.

(3) For passenger chemical oxygen generators  that have a date of manufac-
    ture in 2011, 2012, or 2013: Replace within 24 months after the effec-
    tive date of this AD.

(j) PARTS INSTALLATION LIMITATION

    As of the effective date of this AD, no person may install a passenger
    chemical oxygen generator,  unless the oxygen generator  is a service-
    able unit, as defined in this AD.

(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  responsible  Flight  Standards  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
    responsible Flight Standards 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 Company 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, modifica-
    tion deviation,  or  alteration deviation  must meet the certification
    basis of the airplane and the approval must specifically refer to this
    AD.

(l) RELATED INFORMATION

(1) For more information about this AD, contact Nicole S. Tsang, Aerospace
    Engineer, Cabin Safety and Environmental Systems Section, FAA, Seattle
    ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone: 206-231
    -3959; email: nicole.s.tsang@faa.gov.

(2) For Collins Aerospace  service information  identified in this AD that
    is not  incorporated by  reference,  contact Collins Aerospace,  15701
    West 95th Street, Lenexa, KS 66219; email  ISPublications@collins.com;
    website tpi.beaerospace.com/Authentication. You may view this  service
    information at  the FAA,  Airworthiness Products  Section, Operational
    Safety Branch, 2200 South 216th  St., Des Moines, WA. For  information
    on the availability of this material at the FAA, call 206-231-3195.

(m) MATERIAL INCORPORATED BY REFERENCE

    None.

Issued on November 10, 2022. Christina Underwood, Acting Director, Compli-
ance & Airworthiness Division, Aircraft Certification Service.

DATES: The FAA must receive comments  on this  proposed AD  by January 23,
2023.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-1479; Project Identifier AD-2022-00703-T]
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 adopt a new airworthiness directive (AD)
for all The Boeing Company Model 737-100, 737-200, 737-200C, 737-300,
737-400, 737-500, 737-600, 737-700, 737-700C, 737-800, 737-900, 737-
900ER, 757-200, 757-200PF, 757-200CB, 757-300, 767-200, 767-300, 767-
300F, and 767-400ER series airplanes. This proposed AD was prompted by
reports indicating premature aging of certain passenger chemical oxygen
generators. This proposed AD would require repetitively replacing
affected chemical oxygen generators with serviceable parts. This
proposed AD would also limit the installation of affected parts. 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 January 23,
2023.

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 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.

Examining the AD Docket

You may examine the AD docket at regulations.gov by searching for
and locating Docket No. FAA-2022-1479; 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, any comments
received, and other information. The street address for Docket
Operations is listed above.

FOR FURTHER INFORMATION CONTACT: Nicole S. Tsang, Aerospace Engineer,
Cabin Safety and Environmental Systems Section, FAA, Seattle ACO
Branch, 2200 South 216th St., Des Moines, WA 98198; phone: 206-231-
3959; email: nicole.s.tsang@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 ADDRESSES. Include ``Docket No. FAA-2022-1479; Project Identifier
AD-2022-00703-T'' at the beginning of your comments. The most helpful
comments reference a specific portion of the proposal, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
this proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
regulations.gov, including any personal information you provide. The
agency will also post a report summarizing each substantive verbal
contact received about this NPRM.

Confidential Business Information

CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as ``PROPIN.'' The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to
Nicole S. Tsang, Aerospace Engineer, Cabin Safety and Environmental
Systems Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des
Moines, WA 98198; phone: 206-231-3959; email: nicole.s.tsang@faa.gov.
Any commentary that the FAA receives that is not specifically
designated as CBI will be placed in the public docket for this
rulemaking.

Background

The FAA has been notified by the European Union Aviation Safety
Agency (EASA), which is the Technical Agent for the Member States of
the European Union, of an issue with the B/E Aerospace 117042-XX series
chemical oxygen generators installed on certain Airbus airplanes. The
units may fail to deliver oxygen to passengers during an emergency on
the airplane. To address this issue on certain Airbus airplanes, EASA
issued AD 2015-0117, dated June 24, 2015, corrected August 7, 2015, and
AD 2019-0140, dated June 12, 2019. The FAA issued corresponding AD
2016-16-02, Amendment 39-18600 (81 FR 53255, August 12, 2016), and AD
2020-04-18, Amendment 39-19855 (85 FR 14409, March 12, 2020),
respectively, which require the replacement of units older than 10
years and impose a 10-year life limit on all 117042-XX series
generators.
The FAA released Special Airworthiness Information Bulletin NM-17-
17, dated June 19, 2017, which indicated that the FAA and B/E Aerospace
Systems planned to conduct further investigation of chemical oxygen
generators in the 117080 series that are 10 to 15 years old since date
of manufacture, to determine if these generators have an issue similar
to the 117042 series generators.
The reduction of useful life was changed for 117080-02, 117080-03,
and 117080-04 series chemical oxygen generators from 15 years to 10
years. Collins Aerospace has Parts Manufacturer Approval (PMA) for
117080-02, 117080-03, and 117080-04 series chemical oxygen generators
on all Boeing Model 737-100, 737-200, 737-200C, 737-300, 737-400, 737-
500, 737-600, 737-700, 737-700C, 737-800, 737-900, 757-200, 757-200PF,
757-200CB, 757-300, 767-200, 767-300, 767-300F, and 767-400ER series
airplanes. However, the applicability of this proposed AD also includes
Boeing Model 737-900ER series airplanes. The FAA determined that Boeing
Model 737-900ER series airplanes are affected because there is concern
that operators might mistake the 737-900ER as a sub-model of the 737-
900, and the 117080-0X series of chemical oxygen generators might be
installed on Boeing Model 737-900ER series airplanes.
Collins Aerospace has observed that mis-actuations are possible 10
years after the manufacturing date and increase in likelihood as the
15-year life is approached. The mis-actuations are associated with the
tin-based chemistry used to manufacture the generators and specifically
appear to be caused by oxidation of tin fuel added to the chemical
core. Collins Aerospace's investigation and analysis concluded that the
chemical core oxidizes in a manner similar to the 117042-XX series
chemical oxygen generators. This condition, if not addressed, could
lead to failure of the generator to activate and consequently not
deliver oxygen during an emergency, possibly resulting in injury to
airplane occupants.

FAA's Determination

The FAA is issuing this NPRM after determining that the unsafe
condition described previously is likely to exist or develop on other
products of the same type design. This product has been approved by the
aviation authority of another country, and is approved for operation in
the United States. Pursuant to the FAA's bilateral agreement with the
State of Design Authority, the FAA has been notified of the unsafe
condition described in the AD and service information referenced above.
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 on other products of the same type design.

Related Service Information

Collins Aerospace Service Information Letter (SIL) 117080-SIL-002,
dated May 4, 2022, specifies procedures for replacing affected chemical
oxygen generators.

Proposed AD Requirements in This NPRM

This proposed AD would require inspecting the date of manufacture
of chemical oxygen generators having part numbers 117080-02, 117080-03,
and 117080-04, and replacing affected generators with serviceable
units. This proposed AD would also limit the installation of passenger
chemical oxygen generators to serviceable units.

Costs of Compliance


The FAA estimates that this AD, if adopted as proposed, would
affect 3,419 airplanes of U.S. registry. The FAA 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 4 work-hours x $85 per hour = $340 $0 $340 $1,162,460
Replacement 0.50 work-hour x $85 per hour = $43 per replacement cycle Up to $445 Up to $488 per replacement cycle $1,668,472 per replacement cycle

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.

Regulatory Findings


The FAA 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 this proposed
regulation:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Would not affect intrastate aviation in Alaska, and
(3) Would 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 adding the following new airworthiness
directive: