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PROPOSED AD BOMBARDIER, INC.: Docket No. FAA-2022-1480; Project Identifier MCAI-2022-00548-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments  on this airworthiness directive (AD) by
    January 3, 2023.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to Bombardier, Inc., Model BD-100-1A10 airplanes, cer-
    tificated in any category serial numbers 20003 through 20500 inclusive
    and 20501 through 20916 inclusive.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 53, Fuselage.

(e) UNSAFE CONDITION

    This AD was prompted by reports of cracks found in the tailcone  upper
    firewall  where  the  auxiliary power  unit  (APU)  muffler electrical
    bonding  strap is  attached. The  FAA is  issuing this  AD to  address
    cracking in the tailcone upper firewall. The unsafe condition, if  not
    addressed, could result in a breach of the firewall, which could allow
    a fire to propagate; reduced lightning strike protection, which  could
    affect  the airplane’s  grounding and  potentially cause  a fire;  and
    increased radio  interference during  flight, which  could reduce  the
    ability of the flightcrew to  maintain the safe flight and  landing of
    the airplane.

(f) COMPLIANCE

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

(g) INSPECTION, REPLACEMENT, AND CORRECTIVE ACTIONS

    Within 48 months after  the effective date of  this AD: Do a  detailed
    visual inspection of the tailcone upper firewall for defects including
    cracking, rework the APU electrical bonding strap by replacing with  a
    new flexible APU  muffler jumper cable  assembly, and repair  the tail
    cone  upper firewall,  as applicable,  in  accordance  with paragraphs
    2.B.,  2.C.,  and  2.D., of  the  Accomplishment  Instructions of  the
    applicable service information  specified in figure 1 to paragraph (g)
    of this AD. Do all applicable repairs before further flight.

                FIGURE 1 TO PARAGRAPH (G) – SERVICE INFORMATION
    ______________________________________________________________________
    AIRPLANE SERIAL NUMBER–             BOMBARDIER SERVICE BULLETIN–
    ______________________________________________________________________
    20003 through 20500 inclusive       100-53-35, dated December 6, 2021
    20501 through 20916 inclusive       350-53-004, dated December 6, 2021
    ______________________________________________________________________

(h) ADDITIONAL 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 New York ACO  Branch, mail
    it to  ATTN: Program  Manager, Continuing  Operational Safety,  at the
    address identified in paragraph (i)(2)  of this AD or email  to: 9-avs
    -nyaco-cos@faa.gov. If mailing information, also submit information by
    email.  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.

(i) ADDITIONAL INFORMATION

(1) Refer to TCCA AD CF-2022-19 dated April 19, 2022, for related informa-
    tion. This TCCA AD  may be found  in the AD docket  at regulations.gov
    under Docket No. FAA-2022-1480.

(2) For more information  about this AD,  contact  Yaser Osman,  Aerospace
    Engineer, Airframe and Propulsion Section,  FAA,  New York ACO Branch,
    1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-
    7300; email 9-avs-nyacocos@faa.gov.

(3) For service information identified in this AD that is not incorporated
    by reference, contact  Bombardier Business Aircraft  Customer Response
    Center,  400 Cote-Vertu  Road West,  Dorval, Québec  H4S 1Y9,  Canada;
    telephone  514-855-2999;  email  ac.yul@aero.bombardier.com;   website
    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.

(j) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference (IBR) of  the service information  listed in this  paragraph
    under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use this service information as applicable  to do the actions
    required by this AD, unless this AD specifies otherwise.

(i) Bombardier Service Bulletin 100-53-35, dated December 6, 2021.

(ii) Bombardier Service Bulletin 350-53-004, dated December 6, 2021.

(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; website bombardier.com.

(4) You may view this service information at the FAA,  Airworthiness Prod-
    ucts 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.

(5) You may view  this service information  that is incorporated by refer-
    ence at the National Archives and Records Administration  (NARA).  For
    information on the availability of this material  at  NARA,  email fr.
    inspection@nara.gov,  or go to: www.archives.gov/federal-register/cfr/
    ibr-locations.html.

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 3,
2023.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39


[Docket No. FAA-2022-1480; Project Identifier MCAI-2022-00548-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-100-1A10 airplanes. This
proposed AD was prompted by reports of cracks found in the tailcone
upper firewall where the auxiliary power unit (APU) muffler electrical
bonding strap is attached. This proposed AD would require a detailed
visual inspection of the tailcone upper firewall for defects, rework by
replacement of the APU electrical bonding strap, and repair if
necessary. 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 3,
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.
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2022-1480; 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 mandatory continuing airworthiness
information (MCAI), any comments received, and other information. The
street address for Docket Operations is listed above.
Material Incorporated by Reference:
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; website 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.

FOR FURTHER INFORMATION CONTACT: Yaser Osman, Aerospace Engineer,
Airframe and Propulsion 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-2022-1480; Project Identifier
MCAI-2022-00548-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
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 Yaser
Osman, Aerospace Engineer, Airframe and Propulsion 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-2022-19, dated April 19,
2022 (TCCA AD CF-2022-19) (also referred to after this as the MCAI), to
correct an unsafe condition on certain Bombardier, Inc., Model BD-100-
1A10 airplanes. The MCAI states that cracks were found in the tailcone
upper firewall where the APU muffler electrical bonding strap is
attached. Crack initiation is related to the rigid electrical bonding
strap. A crack in this area, if not addressed, could result in a breach
of the firewall, which could allow a fire to propagate; reduced
lightning strike protection, which could affect the airplane's
grounding and potentially cause a fire; and increased radio
interference during flight, which could reduce the ability of the
flightcrew to maintain the safe flight and landing of the airplane.
You may examine the MCAI in the AD docket at regulations.gov under
Docket No. FAA-2022-1480.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Bombardier Service Bulletin 100-53-35, dated
December 6, 2021; and Service Bulletin 350-53-004, dated December 6,
2021. This service information specifies procedures for doing a
detailed visual inspection of the tailcone upper firewall for defects
including cracking, reworking the APU electrical bonding strap by
replacing it with a new flexible APU muffler jumper cable assembly, and
repairing the tailcone upper firewall. These documents are distinct
since 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 this State of Design Authority,
it has notified the FAA of the unsafe condition described in the MCAI
and service information described above. 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.

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 691 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
$36
$121
$83,611

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

Estimated Costs of On-Condition Actions

Labor cost
Parts cost
Cost per product
24 work-hours x $85 per hour = $2,040
* $0
$2,040

* The FAA has received no definitive data on which to base the cost
estimates for the parts 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.

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: