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PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2022-0470; Project Identifier MCAI-2021-01002-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    June 10, 2022.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to all Bombardier, Inc., Model BD-700-1A10 and BD-700-
    1A11 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  that some passenger  oxygen box dual
    manifold had their piston ejected during the mask deployment test  due
    to a non-conformity  in manufacturing. The  FAA is issuing  this AD to
    address a possible in-service piston ejection when used for  emergency
    descent, smoke,  or fire  that may  result in  a high  rate of  oxygen
    leakage,  which   could  prematurely   deplete  the   oxygen  for  all
    passengers.

(f) COMPLIANCE

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

(g) DEFINITION

    An affected  part is  a passenger  oxygen box  assembly having  a dual
    manifold assembly having part number  100-009-39 and a lot and  serial
    number specified in figure 1 to paragraph (g) of this AD.

                  FIGURE 1 TO PARAGRAPH (G)  AFFECTED PART               
    ______________________________________________________________________
    LOT NUMBERS AFFECTED                 SERIAL NUMBERS AFFECTED
    ______________________________________________________________________
         3516-001                3516-001-01 through 3516-001-60 inclusive
         3538-002                3538-002-01 through 3538-002-60 inclusive
         3598-001                3598-001-01 through 3598-001-60 inclusive
         3568-001                3568-001-01 through 3568-001-60 inclusive
         3724-001                3724-001-01 through 3724-001-20 inclusive
         3724-002                3724-002-01 through 3724-002-12 inclusive
         3706-001                3706-001-01 through 3706-001-40 inclusive
    ______________________________________________________________________

(h) REQUIRED ACTIONS

    Within the applicable compliance time specified in paragraph (h)(1) or
    (2)  of  this AD:  Inspect  each passenger  oxygen  box dual  manifold
    assembly  to  determine if  it  is an  affected  part, as  defined  in
    paragraph (g) of this AD, and replace any affected part in  accordance
    with  paragraph  2.B.  of  the  Accomplishment  Instructions  of   the
    applicable  Bombardier  service  bulletin  specified  in  figure  2 to
    paragraph (h)  of this  AD. Replace  any affected  part before further
    flight.

(1) For  airplanes  having  serial  numbers 9771, 9779, 9784, 9788 through
    9824 inclusive,  9853 through  9857 inclusive,  and 9859  through 9876
    inclusive, within 4 months after the effective date of this AD.

(2) For airplane  having  serial  numbers 9877 through 9879 inclusive, and
    60001 through 60042  inclusive, within 30  months after the  effective
    date of this AD.

           FIGURE 2 TO PARAGRAPH (H)  APPLICABLE SERVICE BULLETINS       
    ______________________________________________________________________
    AIRPLANE MODEL AND SERIAL NUMBERS          APPLICABLE SERVICE BULLETIN
    ______________________________________________________________________
    BD-700-1A10, serial numbers 9771, 9779,         700-35-6004,
    9784, 9788, 9789, 9791 through 9797 in-         Revision 05, dated
    clusive, 9799 through 9806 inclusive,           August 27, 2021
    9808, 9809, 9811, 9812, 9814 through
    9818 inclusive, 9820 through 9824 inclu-
    sive, 9853 through 9857 inclusive, 9859,
    9860, 9863 through 9871 inclusive, 9873
    through 9879 inclusive, and 60005 through
    60042 inclusive

    BD-700-1A10, serial numbers 9861, 9872,         700-35-6502, dated
    and 60001 through 60042 inclusive               August 27, 2021

    BD-700-1A11 serial numbers 9790, 9798,          700-35-5004,
    9807, 9810, 9813, 9819, 9853 through            Revision 02, dated
    9857 inclusive, 9859 through 9862 inclu-        August 27, 2021
    sive, and 9868 through 9879 inclusive

    BD-700-1A11, serial numbers 60007 through       700-35-5502, dated
    60042 inclusive                                 August 27, 2021
    ______________________________________________________________________

(i) PARTS INSTALLATION PROHIBITION

    As of the effective date of this AD, no person may install an affected
    part as defined in paragraph (g) of this AD, on any airplane.

(j) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit  for actions required by  paragraph (h)
    of this AD, if those actions were performed before the effective  date
    of  this  AD using  the  service information  specified  in paragraphs
    (j)(1) through (7) of this AD, as applicable.

(1) Bombardier Service Bulletin 700-35-5004, dated December 10, 2018.

(2) Bombardier Service Bulletin 700-35-5004,  Revision 01,  dated November
    29, 2019.

(3) Bombardier Service Bulletin 700-35-6004, dated December 10, 2018.

(4) Bombardier Service Bulletin 700-35-6004,  Revision 01,  dated  January
    16, 2019.

(5) Bombardier Service Bulletin 700-35-6004,  Revision 02,  dated April 5,
    2019.

(6) Bombardier Service Bulletin 700-35-6004,  Revision 03,  dated  May 31,
    2019.

(7) Bombardier Service Bulletin 700-35-6004,  Revision 04,  dated November
    29, 2019.

(k) OTHER FAA AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager,  New York 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 ATTN: Program  Manager, Continuing Operational Safety,  FAA, New
    York ACO Branch, 1600 Stewart  Avenue, Suite 410, Westbury, NY  11590;
    telephone 516-228-7300.  Before using  any approved  AMOC, notify your
    appropriate principal inspector, or lacking a principal inspector, the
    manager of the responsible Flight Standards Office.

(2) Contacting the Manufacturer:  For any requirement in this AD to obtain
    instructions   from   a  manufacturer,   the   instructions  must   be
    accomplished using  a method  approved by  the Manager,  New York  ACO
    Branch, FAA; or Transport Canada Civil Aviation (TCCA); or Bombardier,
    Inc.'s TCCA  Design Approval  Organization (DAO).  If approved  by the
    DAO, the approval must include the DAO-authorized signature.

(l) RELATED INFORMATION

(1) Refer to Mandatory Continuing Airworthiness Information (MCAI) TCCA AD
    CF-2021-30, dated September 7, 2021,  for  related  information.  This
    MCAI may be found  in the AD docket  on the internet  at  https://www.
    regulations.gov  by searching  for  and  locating Docket No. FAA-2022-
    0470.

(2) For more information about this AD,  contact Elizabeth Dowling,  Aero-
    space Engineer,  Mechanical Systems  and  Administrative Services Sec-
    tion, FAA, New York ACO Branch,  1600 Stewart Avenue, Suite 410, West-
    bury, NY 11590; telephone 516-228-7300; email 9-avs-nyaco-cos@faa.gov.

(3) For service information  identified  in  this AD,  contact  Bombardier
    Business Aircraft Customer Response Center,  400 Cote-Vertu Road West,
    Dorval, Quebec H4S 1Y9, Canada;  telephone 514-855-2999; email ac.yul@
    aero.bombardier.com; internet https://www.bombardier.com. 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.

Issued on April 20, 2022. Lance T. Gant, Director, Compliance & Airworthi-
ness Division, Aircraft Certification Service.

DATES: The FAA must receive comments on this proposed AD by June 10, 2022.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-0470; Project Identifier MCAI-2021-01002-T]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., 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 Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes.
This proposed AD was prompted by reports that some oxygen box
assemblies had their piston ejected during the mask deployment test.
This proposed AD would require a one-time inspection of each passenger
oxygen box dual manifold assembly to find and replace affected parts.
This proposed AD would also prohibit installing 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 June 10,
2022.

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 https://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 Bombardier
Business Aircraft Customer Response Center, 400 Cote-Vertu Road
West, Dorval, Quebec H4S 1Y9, Canada; telephone 514-855-2999;
email ac.yul@aero.bombardier.com; internet https://www.bombardier.com.
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.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2022-0470; 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: Elizabeth Dowling, Aerospace Engineer,
Mechanical Systems and Administrative Services Section, FAA, New York
ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7300; email 9-avs-nyaco-cos@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-2022-0470; Project Identifier
MCAI-2021-01002-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
the 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
https://www.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
Elizabeth Dowling, Aerospace Engineer, Mechanical Systems and
Administrative Services Section, FAA, New York ACO Branch, 1600 Stewart
Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; email
9-avs-nyaco-cos@faa.gov. Any commentary that the FAA receives which is
not specifically designated as CBI will be placed in the public docket
for this rulemaking.

Background

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued TCCA AD CF-2021-30, dated September 7,
2021 (TCCA AD CF-2021-30) (also referred to after this as the Mandatory
Continuing Airworthiness Information, or the MCAI), to correct an
unsafe condition for all Bombardier, Inc., Model BD-700-1A10 and BD-
700-1A11 airplanes. You may examine the MCAI in the AD docket at
https://www.regulations.gov by searching for and locating Docket No.
FAA-2022-0470.
This proposed AD was prompted by reports that some passenger oxygen
box dual manifold assemblies had their piston ejected during the mask
deployment test due to a non-conformity in manufacturing. The FAA is
proposing this AD to address a possible in-service piston ejection when
used for emergency descent, smoke, or fire that may result in a high
rate of oxygen leakage, which could prematurely deplete the oxygen for
all passengers. See the MCAI for additional background information.

Related Service Information Under 1 CFR Part 51

Bombardier, Inc., has issued the following service information.
Service Bulletin 700-35-5004, Revision 02, dated August
27, 2021.
Service Bulletin 700-35-5502, dated August 27, 2021.
Service Bulletin 700-35-6004, Revision 05, dated August
27, 2021.
Service Bulletin 700-35-6502, dated August 27, 2021.
This service information describes procedures for inspecting each
passenger oxygen box dual manifold assembly to find affected parts, and
replacing affected parts. These documents are distinct because they
apply to different airplane configurations.
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

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 MCAI
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.

Proposed AD Requirements in This NPRM

This proposed AD would require accomplishing the actions specified
in the service information already described.

Costs of Compliance


The FAA estimates that this AD, if adopted as proposed, would
affect 308 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:

Estimated Costs for Required Actions

Labor cost
Parts cost
Cost per product
Cost on U.S. operators
1 work-hour x $85 per hour = $85
$0
$85
$26,180

The FAA estimates the following costs to do any necessary on-
condition actions that would be required based on the results of any
required actions. The FAA has no way of determining the number of
aircraft that might need this on-condition action:

Estimated Costs of On-Condition Actions

Labor cost
Parts cost
Cost per product
Up to 34 work-hours x $85 per hour = $2,890
Up to $1,700
Up to $4,590

The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this proposed AD may be covered under warranty, thereby reducing the
cost impact on affected operators.

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: