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PROPOSED AD MHI RJ AVIATION ULC (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.): Docket No. FAA-2024-0219; Project Identifier MCAI-2023-00764-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    March 18, 2024.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies  to MHI RJ  Aviation ULC (Type  Certificate previously
    held by Bombardier, Inc.) Model CL-600-2B19 (Regional Jet Series 100 &
    440)  airplanes,  certificated  in  any  category,  as  identified  in
    Transport Canada AD CF-2023-41, dated June 15, 2023 (Transport  Canada
    AD CF-2023-41).

(d) SUBJECT

    Air Transport Association (ATA) of America Code 05,  Time Limits/Main-
    tenance Checks.

(e) UNSAFE CONDITION

    This AD was prompted  by  a determination that a more restrictive air-
    worthiness limitation  is necessary.  The FAA  is issuing  this AD  to
    address failure of the strap modification to the fuselage station (FS)
    409 and 128  bulkhead. The unsafe  condition, if not  addressed, could
    result in the loss of the structural integrity of the airplane.

(f) COMPLIANCE

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

(g) REQUIREMENTS

    Except as specified in paragraph (h)  of this AD:  Comply with all re-
    quired actions and compliance times specified in,  and  in  accordance
    with, Transport Canada AD CF-2023-41.

(h) EXCEPTION TO TRANSPORT CANADA AD CF-2023-41

(1) Where Transport Canada AD CF-2023-41  refers  to  its  effective date,
    this AD requires using the effective date of this AD.

(2) Where paragraph A. of Transport Canada AD CF-2023-41 specifies to "in-
    corporate the revised task AWL number 53-41-180 in Appendix B  of  the
    MRM CSP A-053 Part 2,"  this  AD  requires  replacing those words with
    "revise the existing maintenance or inspection program, as applicable,
    by incorporating  the revised task AWL number 53-41-180  specified  in
    MHI RJ Temporary Revision 2B-2283, dated March 16, 2023."

(3) The initial compliance time for doing the task  specified in paragraph
    A. of Transport Canada AD CF-2023-41 is at the applicable  "threshold"
    as specified in the service information  referenced in paragraph B. of
    Transport Canada AD CF-2023-41,  or within 60 days after the effective
    date of this AD, whichever occurs later.

(4) This AD does not adopt paragraph B. of Transport Canada AD CF-2023-41.

(i) PROVISIONS FOR ALTERNATIVE ACTIONS AND INTERVALS

    After the existing maintenance or inspection program  has been revised
    as required by paragraph (g) of this AD, no alternative actions (e.g.,
    inspections) and intervals are allowed  unless  they  are  approved as
    specified in  the provisions  of the  "Corrective Actions"  section of
    Transport Canada AD CF-2023-41.

(j) ADDITIONAL AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager, International
    Validation 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 International
    Validation Branch, mail it to the address identified in paragraph  (k)
    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  accom-
    plished using a method approved by the Manager,  International Valida-
    tion Branch, FAA; or Transport Canada; or MHI RJ Aviation ULC's Trans-
    port Canada Design Approval Organization (DAO). If approved by the DAO
    the approval must include the DAO-authorized signature.

(k) ADDITIONAL INFORMATION

    For more information about this AD contact Mark Taylor, Aviation Safe-
    ty Engineer, FAA,  1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
    phone 516-228-7300; email 9-avs-nyaco-cos@faa.gov.

(l) 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) Transport Canada AD CF-2023-41, dated June 15, 2023.

(ii) [Reserved]

(3) For Transport Canada AD CF-2023-41 contact Transport Canada, Transport
    Canada National Aircraft Certification,  159 Cleopatra Drive,  Nepean,
    Ontario K1A 0N5,  Canada;  phone 888-663-3639;  email TC.Airworthiness
    Directives-Consignesdenavigabilite.TC@tc.gc.ca.   You  may  find  this
    Transport Canada AD  on the Transport Canada  website tc.canada.ca/en/
    aviation.

(4) You may view this material at the FAA, Airworthiness Products Section,
    Operational Safety Branch,  2200 South 216th Street,  Des Moines,  WA.
    For information on the availability of this material at the FAA,  call
    206-231-3195.

(5) You may view this material at the National Archives and Records Admin-
    istration (NARA). For information on the availability of this material
    at NARA,  visit www.archives.gov/federal-register/cfr/ibr-locations or
    email fr.inspection@nara.gov.

Issued on January 29, 2024. Victor Wicklund, Deputy Director, Compliance &
Airworthiness Division, Aircraft Certification Service.

DATES: The FAA must receive comments  on  this  proposed  AD  by March 18,
2024.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-0219; Project Identifier MCAI-2023-00764-T]
RIN 2120-AA64

Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate
Previously Held by 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 MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet Series
100 & 440) airplanes. This proposed AD was prompted by a determination
that a more restrictive airworthiness limitation is necessary. This
proposed AD would require revising the existing maintenance or
inspection program, as applicable, to incorporate a more restrictive
airworthiness limitation, as specified in a Transport Canada AD, which
is proposed for incorporation by reference (IBR). 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 March 18,
2024.

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-2024-0219; 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 Transport Canada material that is identified in this
NPRM, contact Transport Canada, Transport Canada National Aircraft
Certification, 159 Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada;
phone 888-663-3639; email TC.AirworthinessDirectives-Consignesdenavigabilite.
TC@tc.gc.ca. You may find this material on the
Transport Canada website tc.canada.ca/en/aviation. It is also available
at regulations.gov under Docket No. FAA-2024-0219.
You may view this material at the FAA, Airworthiness
Products Section, Operational Safety Branch, 2200 South 216th Street,
Des Moines, WA. For information on the availability of this material at
the FAA, call 206-231-3195.

FOR FURTHER INFORMATION CONTACT: Mark Taylor, Aviation Safety Engineer,
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone 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-2024-0219; Project Identifier
MCAI-2023-00764-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 Mark
Taylor, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; phone 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, which is the aviation authority for Canada, has
issued Transport Canada AD CF-2023-41, dated June 15, 2023 (Transport
Canada AD CF-2023-41) (also referred to as the MCAI), to correct an
unsafe condition on certain MHI RJ Aviation ULC Model CL-600-2B19
(Regional Jet Series 100 & 440) airplanes. The MCAI states that a more
restrictive airworthiness limitation has been developed due to reports
of an unclear effectivity for airworthiness limitation (AWL) task
number 53-41-180 in the Maintenance Requirements Manual (MRM), Part 2.
If the revised task, AWL number 53-41-180, is not performed at the
required intervals, failures of the strap modification to the fuselage
station (FS) 409 and 128 bulkhead could remain undetected and could
result in the loss of the structural integrity of the airplane.
The FAA is proposing this AD to address the unsafe condition on
these products. You may examine the MCAI in the AD docket at
regulations.gov under Docket No. FAA-2024-0219.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Transport Canada AD CF-2023-41, which specifies a
more restrictive airworthiness limitation for AWL task number 53-41-180.
This material is reasonably available because the interested
parties have access to it through their normal course of business or by
the means identified in ADDRESSES.

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
referenced above. The FAA is issuing this NPRM after determining that
the unsafe condition described previously is likely to exist or develop
in other products of the same type design.

Proposed AD Requirements in This NPRM


This proposed AD would require revising the existing maintenance or
inspection program, as applicable, to incorporate or a more restrictive
airworthiness limitation, which is specified in Transport Canada AD CF-
2023-41 described previously, as incorporated by reference. Any
difference with Transport Canada AD CF-2023-41 are identified as
exceptions in the regulatory text of this proposed AD.
This proposed AD would require revisions to certain operator
maintenance documents to include new
actions (e.g., inspections). Compliance with these actions is required
by 14 CFR 91.403(c). For airplanes that have been previously modified,
altered, or repaired in the areas addressed by this proposed AD, the
operator may not be able to accomplish the actions described in the
revisions. In this situation, to comply with 14 CFR 91.403(c), the
operator must request approval for an alternative method of compliance
(AMOC) according to paragraph (j)(1) of this proposed AD.

Explanation of Required Compliance Information

In the FAA's ongoing efforts to improve the efficiency of the AD
process, the FAA developed a process to use some civil aviation
authority (CAA) ADs as the primary source of information for compliance
with requirements for corresponding FAA ADs. The FAA has been
coordinating this process with manufacturers and CAAs. As a result, the
FAA proposes to incorporate Transport Canada AD CF-2023-41 by reference
in the FAA final rule. This proposed AD would, therefore, require
compliance with Transport Canada AD CF-2023-41 in its entirety through
that incorporation, except for any differences identified as exceptions
in the regulatory text of this proposed AD. Service information
required by Transport Canada AD CF-2023-41 for compliance will be
available at regulations.gov under Docket No. FAA-2024-0219 after the
FAA final rule is published.

Airworthiness Limitation ADs Using the New Process

The FAA's process of incorporating by reference MCAI ADs as the
primary source of information for compliance with corresponding FAA ADs
has been limited to certain MCAI ADs (primarily those with service
bulletins as the primary source of information for accomplishing the
actions required by the FAA AD). However, the FAA is now expanding the
process to include MCAI ADs that require a change to airworthiness
limitation documents, such as airworthiness limitation sections.
For these ADs that incorporate by reference an MCAI AD that changes
airworthiness limitations, the FAA requirements are unchanged.
Operators must revise the existing maintenance or inspection program,
as applicable, to incorporate the information specified in the new
airworthiness limitation document. The airworthiness limitations must
be followed according to 14 CFR 91.403(c) and 91.409(e).
The previous format of the airworthiness limitation ADs included a
paragraph that specified that no alternative actions (e.g.,
inspections) or intervals may be used unless the actions and intervals
are approved as an AMOC in accordance with the procedures specified in
the AMOC paragraph under ``Additional AD Provisions.'' This new format
includes a ``Provisions for Alternative Actions and Intervals''
paragraph that does not specifically refer to AMOCs, but operators may
still request an AMOC to use an alternative action or interval.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 78 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:
The FAA has determined that revising the existing maintenance or
inspection program takes an average of 90 work-hours per operator,
although the agency recognizes that this number may vary from operator
to operator. Since operators incorporate maintenance or inspection
program changes for their affected fleet(s), the FAA has determined
that a per-operator estimate is more accurate than a per-airplane
estimate. Therefore, the agency estimates the average total cost per
operator to be $7,650 (90 work-hours x $85 per work-hour).

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: