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PROPOSED AD MHI RJ AVIATION ULC (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.): Docket No. FAA-2024-0031; Project Identifier MCAI-2022-01307-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    March 1, 2024.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to MHI RJ Aviation ULC  (Type  Certificate  Previously
    Held by Bombardier, Inc.)  Model CL-600-2C10 (Regional Jet Series 700,
    701 & 702);  CL-600-2C11  (Regional Jet Series 550);  CL-600-2D15 (Re-
    gional Jet Series 705); and CL-600-2D24 (Regional Jet Series 900) air-
    planes, certificated in any category, as identified in Transport Cana-
    da AD CF-2022-54R1, dated October 4, 2022 (Transport Canada AD CF-2022
    -54R1).

(d) SUBJECT

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

(e) UNSAFE CONDITION

    This AD was prompted  by a determination  that the MHI RJ Non-Destruc-
    tive Testing Manual (NDTM) Part 6, Procedure 53-61-121-250, associated
    with Airworthiness Limitations (ALI)  Task 53-61-121, is not  adequate
    to  detect a  potential crack  of  the  tombstone fitting  lug as  the
    bushings remain in place during the special detailed inspection (SDI).
    The FAA is issuing this AD  to address the undetected cracking of  the
    tombstone fitting  lug. If  the crack  is not  detected, the tombstone
    fitting lug will eventually fail. The failure will cause a transfer of
    load to other engine attachment points, which will then be  overloaded
    and compromised  in their  structural integrity.  This can  lead to  a
    rapid failure mode, potentially resulting in the loss of the engine.

(f) COMPLIANCE

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

(g) REQUIREMENTS

    Except as required by paragraph (h) of this AD:  Comply  with  all re-
    quired actions and compliance times specified in,  and  in  accordance
    with, Transport Canada CF-2022-54R1.

(h) EXCEPTIONS TO TRANSPORT CANADA CF-2022-54R1

(1) Where Transport Canada AD CF-2022-54R1 refers to the effective date of
    AD CF-2022-54 (September 27, 2022),  this AD requires using the effec-
    tive date of this AD.

(2) Where paragraph A. of Transport Canada AD CF-2022-54R1  specifies  in-
    specting "For aeroplanes that, as of the effective date of AD CF-2022-
    54 (27 September 2022), have not been inspected as required by MRM CSP
    B-053 Part 2 ALI Task 53-61-121," this AD requires replacing those
    words with "For all airplanes."

(3) This  AD  does  not adopt paragraph B. of Transport Canada AD CF-2022-
    54R1.

(4) Where paragraph A. of Transport Canada AD CF-2022-54R1  specifies  in-
    specting "within the intervals in MRM CSP B-053 Part 2 for ALI Task 53
    -61-121," for this AD,  the  initial  compliance  time for the task is
    within the "threshold" specified in the service information identified
    in paragraph A. Transport Canada AD CF-2022-54R1  or  within  90  days
    after the effective date of this AD, whichever occurs later.

(i) CRACK REPAIR

    If any cracking is found  during the actions required by paragraph (g)
    of this AD,  repair the cracking before further flight  using a method
    approved by the Manager,  International  Validation  Branch,  FAA;  or
    Transport Canada;  or  MHI RJ Aviation  ULC's  Transport Canada Design
    Approval Organization (DAO). If approved by the DAO, the approval must
    include the DOA-authorized signature.

(j) NO REPORTING REQUIREMENT

    Although the service information referenced in Transport Canada AD CF-
    2022-54R1 specifies to submit certain information to the manufacturer,
    this AD does not include that requirement.

(k) 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  (l)
    of this  AD. Information  may be  emailed to: 9-AVS-NYACO-COS@faa.gov.
    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,  International
    Validation Branch, FAA; or Transport Canada; or MHI RJ Aviation  ULC's
    Transport Canada  Design Approval  Organization (DAO).  If approved by
    the DAO, the approval must include the DAO-authorized signature.

(l) ADDITIONAL INFORMATION

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

(m) 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-2022-54R1, dated October 4, 2022.

(ii) [Reserved]

(3) For Transport Canada AD CF-2022-54R1, contact Transport Canada, Trans-
    port  Canada  National  Aircraft  Certification,  159 Cleopatra Drive,
    Nepean,  Ontario K1A 0N5, Canada;  telephone  888-663-3639;  email TC.
    AirworthinessDirectives-Consignesdenavigabilite.TC@tc.gc.ca.  You  may
    find this Transport Canada AD  on the Transport Canada  website at tc.
    canada.ca/en/aviation.

(4) You may view this material 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.

(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 6, 2024. Caitlin Locke, Director, Compliance & Airworth-
iness Division, Aircraft Certification Service.

DATES: The FAA must receive comments on this proposed AD by March 1, 2024.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


14 CFR Part 39

[Docket No. FAA-2024-0031; Project Identifier MCAI-2022-01307-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-600-2C10 (Regional Jet Series
700, 701 & 702); CL-600-2C11 (Regional Jet Series 550); CL-600-2D15
(Regional Jet Series 705); and CL-600-2D24 (Regional Jet Series 900)
airplanes. This proposed AD was prompted by a determination that a
potential crack of the tombstone fitting lug cannot be detected as the
bushings remaining in place during accomplishment of the special
detailed inspection (SDI) required by a certain airworthiness
limitation (ALI) task. This proposed AD would require inspecting the
tombstone fitting lug with a new SDI sub-surface ultrasound procedure
when accomplishing the ALI task, as specified in a Transport Canada AD,
which is proposed for incorporation by reference (IBR). This proposed
AD would also require corrective actions 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 March 1,
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-2024-0031; 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 material that is proposed for IBR in this AD, contact
Transport Canada, Transport Canada National Aircraft Certification, 159
Cleopatra Drive, Nepean, Ontario K1A 0N5, Canada; telephone 888-663-
3639; email TC.AirworthinessDirectives-Consignesdenavigabilite.TC@tc.gc.ca.
You may find this material on the
Transport Canada website at tc.canada.ca/en/aviation. It is also
available at regulations.gov under Docket No. FAA-2024-0031.
You may view this material 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, Aviation Safety Engineer,
FAA, 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-2024-0031; Project Identifier
MCAI-2022-01307-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 Yaser
Osman, Aviation Safety Engineer, FAA, 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, which is the aviation authority for Canada, has
issued Transport Canada AD CF-2022-54R1, dated October 4, 2022
(Transport Canada AD CF-2022-54R1) (also referred to after this as the
MCAI), to correct an unsafe condition for certain MHI RJ Aviation ULC
Model CL-600-2C10 (Regional Jet Series 700, 701 & 702); CL-600-2C11
(Regional Jet Series 550); CL-600-2D15 (Regional Jet Series 705); and
CL-600-2D24 (Regional Jet Series 900) airplanes. Transport Canada AD
CF-2022-54R1 superseded Transport Canada AD CF-2022-54, dated September
13, 2022 (Transport Canada AD CF-2022-54), to correct a reference to an
incorrect maintenance requirements manual number.
Transport Canada AD CF-2022-54R1 states that MHI RJ discovered that
the MHI RJ Non-Destructive Testing Manual (NDTM) Part 6, Procedure 53-
61-121-250, associated with ALI Task 53-61-121, is not adequate to
detect a potential crack of the tombstone fitting lug before the
critical crack size is reached as the bushings remain in place during
the SDI. Transport Canada AD CF-2022-54R1 mandates the use of new
ultrasonic MHI RJ NDTM Part 4, Procedure 53-61-121-270, in conjunction
with NDTM Part 6, Procedure 53-61-121-250, during accomplishment of the
SDIs required by ALI Task 53-61-121.
The FAA is proposing this AD to address the undetected cracking of
the tombstone fitting lug. If the crack is not detected, the tombstone
fitting lug will eventually fail. The failure will cause a transfer of
load to other engine attachment points, which will then be overloaded
and compromised in their structural integrity. This can lead to a rapid
failure mode, potentially resulting in the loss of the engine. You may
examine the MCAI in the AD docket at regulations.gov under Docket No.
FAA-2024-0031.

Related Service Information Under 1 CFR Part 51

Transport Canada AD CF-2022-54R1 specifies procedures for
accomplishing a special detailed inspection for cracks of the engine
forward support frame's tombstone top and bottom fitting lugs at frame
fuselage station (FS) 1051.30, during the accomplishment of the SDIs
required by ALI Task 53-61-121. 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 and
service information 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 accomplishing the actions specified
in Transport Canada AD CF-2022-54R1 described previously, except for
any differences identified as exceptions in the regulatory text of this
proposed AD, and except as discussed under ``Difference Between this Proposed
AD and the MCAI.''

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-2022-54R1 by
reference in the FAA final rule. This proposed AD would, therefore,
require compliance with Transport Canada AD CF-2022-54R1 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-2022-54R1 for
compliance will be available at regulations.gov under Docket No. FAA-
2024-0031 after the FAA final rule is published.

Difference Between This NPRM and the MCAI

Transport Canada AD CF-2022-54R1 did not specify any corrective
action for cracking found during the required inspection. This proposed
AD would require repairing all cracks before further flight.

Costs of Compliance


The FAA estimates that this AD, if adopted as proposed, would
affect 597 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
2 work-hours x $85 per hour = $170 (per interval) $0 $170 (per interval) $101,490 (per interval)

The FAA has received no definitive data on which to base the cost
estimates for the repairs 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: