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PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2022-0687; Project Identifier MCAI-2021-01405-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments  on this airworthiness directive (AD) by
    August 5, 2022.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to Bombardier, Inc., Model BD-700-2A12 airplanes, cer-
    tificated in any category,  serial numbers  (S/Ns) 70006 through 70044
    inclusive, 70046 through 70052 inclusive, 70055, 70056, and 70062.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 26, Fire protection.

(e) UNSAFE CONDITION

    This AD was prompted by a determination that the baggage bay line fire
    extinguishing tube  assembly might  not have  been installed  with the
    correct  torque.  The  FAA  is issuing  this  AD  to  address improper
    torqueing, which may  lead to loss  of the fire  extinguishing system,
    which could prevent extinguishing a fire and possibly result in damage
    to the airplane and injury to occupants.

(f) COMPLIANCE

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

(g) RE-TORQUE FIRE EXTINGUISHING TUBE ASSEMBLY

    Within 28 months  after the effective  date of this  AD: Re-torque the
    baggage  bay  line fire  extinguishing  tube assembly  to  the correct
    torque  values,  and  apply  corrosion  inhibiting  compound  on   the
    discharge tubes, in accordance with the Accomplishment Instructions of
    Bombardier Service Bulletin 700-26-7503, dated April 22, 2021.

(h) NO REPORTING REQUIREMENT

    Although Bombardier Service Bulletin 700-26-7503, dated April 22, 2021
    specifies to submit certain information to the manufacturer,  this  AD
    does not include that requirement.

(i) 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.

(j) RELATED INFORMATION

(1) Refer to Mandatory Continuing Airworthiness Information (MCAI) TCCA AD
    CF-2021-48, dated  December 15,  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-2022-0687.

(2) For more information about this AD,  contact Elizabeth Dowling,  Aero-
    space 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.

(3) For service information identified in this AD, contact Bombardier Bus-
    iness 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 June 13, 2022.  Christina Underwood, Acting Director, Compliance
& Airworthiness Division, Aircraft Certification Service.

DATES: The FAA must receive comments  on  this  proposed  AD  by August 5,
2022.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-0687; Project Identifier MCAI-2021-01405-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 certain Bombardier, Inc., Model BD-700-2A12 airplanes. This
proposed AD was prompted by a determination that the baggage bay line
fire extinguishing tube assembly might not have been installed with the
correct torque. This proposed AD would require re-torqueing the baggage
bay line fire extinguishing tube assembly to the correct torque values,
and applying corrosion inhibiting compound on the discharge tubes. 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 5,
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-2022-0687; 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-2022-0687; Project Identifier
MCAI-2021-01405-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-2021-48, dated December 15,
2021 (CF-2021-48) (also referred to after this as the Mandatory
Continuing Airworthiness Information, or the MCAI), to correct an
unsafe condition for certain for certain Bombardier, Inc., Model BD-
700-2A12 airplanes. You may examine the MCAI in the AD docket at
https://www.regulations.gov by searching for and locating Docket No.
FAA-2022-0687.
This proposed AD was prompted by a determination that the baggage
bay line fire extinguishing tube assembly might not have been installed
with the correct torque. Although the baggage bay is accessible to the
crew during flight with portable fire extinguishers, incorrect
torqueing of the baggage bay line fire extinguishing tube assembly
could lead to loss of the built-in fire extinguishing system for the
baggage bay. The FAA is proposing this AD to address improper
torqueing, which may lead to loss of the fire extinguishing
system, which could prevent extinguishing a fire and possibly result in
damage to the airplane and injury to occupants. See the MCAI for
additional background information.

Related Service Information Under 1 CFR Part 51

Bombardier Inc. has issued Service Bulletin 700-26-7503, dated
April 22, 2021. This service information describes procedures for re-
torqueing the baggage bay line fire extinguishing tube assembly to the
correct torque values, and applying corrosion inhibiting compound on
the discharge tubes. 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 42 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
$5
$90
$3,780

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: