preamble attached >>>
ADs updated daily at www.Tdata.com
2024-03-02 MHI RJ AVIATION ULC (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.): Amendment 39-22671; Docket No. FAA-2023-1704; Project Identifier MCAI-2022-00866-T.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective April 9, 2024.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to all MHI RJ Aviation ULC (Type Certificate Previous-
    ly Held by Bombardier, Inc.)  Model  CL-600-2C10  (Regional Jet Series
    700, 701 & 702),  CL-600-2C11  (Regional Jet Series 550),  CL-600-2D15
    (Regional Jet Series 705),  CL-600-2D24 (Regional Jet Series 900), and
    CL-600-2E25 (Regional Jet Series 1000) airplanes,  certificated in any
    category.

(d) SUBJECT

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

(e) REASON

    This AD was prompted by  a determination that new or  more restrictive
    airworthiness limitations are necessary. The FAA is issuing this AD to
    address cracks in  the principal structural  elements of the  fuselage
    and wings.  The unsafe  condition, if  not addressed,  could result in
    reduced structural integrity of the airplane.

(f) COMPLIANCE

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

(g) MAINTENANCE OR INSPECTION PROGRAM REVISION

    Within 60 days after the effective date of this AD,  revise the exist-
    ing maintenance or inspection program,  as applicable,  to incorporate
    the tasks identified in figure 1 to paragraph (g) of this AD as speci-
    fied in MHI RJ Aviation CRJ550/700/705/900/1000  Maintenance  Require-
    ments Manual (MRM) Part 2,  CSP B-053,  Revision 26,  dated  March 25,
    2022. The initial compliance time for doing the tasks is at the appli-
    cable times specified in MHI RJ Aviation CRJ550/700/705/900/1000 Main-
    tenance Requirements Manual (MRM) Part 2, CSP B-053, Revision 26 dated
    March 25, 2022, or within 60 days after the effective date of this AD,
    whichever occurs later.
    ______________________________________________________________________
                    FIGURE 1 TO PARAGRAPH (G) - MRM TASKS                 
    ______________________________________________________________________
    TASK       CONFIGURATION               TITLE
    NUMBER     LETTER (LTR)
    ______________________________________________________________________
    53-11-103     G          Pressure Bulkhead - FS202.75

    53-41-115     C          Overwing Longerons, Bottom Flanges - FS693.00
                             to FS847.00 +16.60, WL73.00

    53-41-120     B          Emergency Exit Door Cut-Out Corner

    53-41-121     A          Pressure Sill Deck FS693 - FS847

    53-51-110     C          Skin Penetrations FS847.00 +8.40 to FS977.00,
                             Below WL72.00

    53-61-101     A, B       Skin Lap Splice - FS977.00 to FS1162.00,
                             STGR7L, STGR20L, STGR7R, and STGR20R

    53-61-114     C          Aft Pressure Bulkhead FS1098.2

    57-42-109     A          Slat #3 Attachment

    57-53-101     A, B, C    Outboard Flap Hinge Arms

    57-53-102     A, B, C    Outboard Flap Vane Structure

    57-53-103     A, B, C    Outboard Flap Vane Mounting Structure

    57-53-104     A, B, C    Outboard Flap Box Structure

    57-53-105     A, B, C    Outboard Flap Hinge Arm Support Fittings and
                             Surround Structure

    57-53-108     A, B, D    Outboard Flap Hinge Support Fittings
    ______________________________________________________________________

(h) NO ALTERNATIVE ACTIONS OR 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)  or  intervals,  may  be  used  unless  the  actions  and
    intervals are approved as  an alternative method of  compliance (AMOC)
    in accordance  with the  procedures specified  in paragraph  (j)(1) of
    this AD.

(i) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit for the actions  specified in paragraph
    (g) of this AD,  if those actions were performed  before the effective
    date of this AD using  the service information  specified in paragraph
    (i)(1) or (2) of this AD, as applicable.

(1) For the tasks  specified  in  figure 2 to paragraph (i)(1) of this AD:
    MHI RJ Aviation CRJ550/700/705/900/1000 Maintenance Requirements Manu-
    al (MRM) Part 2, CSP B-053, Revision 24, dated February 25, 2021.
    ______________________________________________________________________
    FIGURE 2 TO PARAGRAPH (I)(1)  CREDIT FOR TASKS USING MRM REVISION 24 
    ______________________________________________________________________
    TASK       CONFIGURATION               TITLE
    NUMBER     LETTER (LTR)
    ______________________________________________________________________
    53-11-103     G          Pressure Bulkhead - FS202.75

    53-61-101     A, B       Skin Lap Splice - FS977.00 to FS1162.00,
                             STGR7L, STGR20L, STGR7R, and STGR20R

    53-61-114     C          Aft Pressure Bulkhead FS1098.2

    57-42-109     A          Slat #3 Attachment

    57-53-101     A, B, C    Outboard Flap Hinge Arms

    57-53-102     A, B, C    Outboard Flap Vane Structure

    57-53-103     A, B, C    Outboard Flap Vane Mounting Structure

    57-53-104     A, B, C    Outboard Flap Box Structure

    57-53-105     A, B, C    Outboard Flap Hinge Arm Support Fittings and
                             Surround Structure

    57-53-108     A, B, D    Outboard Flap Hinge Support Fittings
    ______________________________________________________________________

(2) For the tasks  specified  in  figure 3 to paragraph (i)(2) of this AD:
    MHI RJ Aviation CRJ550/700/705/900/1000 Maintenance Requirements Manu-
    al (MRM) Part 2, CSP B-053, Revision 25, dated June 25, 2021.
    ______________________________________________________________________
    FIGURE 3 TO PARAGRAPH (I)(2)  CREDIT FOR TASKS USING MRM REVISION 25 
    ______________________________________________________________________
    TASK       CONFIGURATION               TITLE
    NUMBER     LETTER (LTR)
    ______________________________________________________________________
    53-11-103     G          Pressure Bulkhead - FS202.75

    53-41-115     C          Overwing Longerons, Bottom Flanges - FS693.00
                             to FS847.00 +16.60, WL73.00

    53-41-120     B          Emergency Exit Door Cut-Out Corner

    53-51-110     C          Skin Penetrations FS847.00 +8.40 to FS977.00,
                             Below WL72.00

    53-61-101     A, B       Skin Lap Splice - FS977.00 to FS1162.00,
                             STGR7L, STGR20L, STGR7R, and STGR20R

    53-61-114     C          Aft Pressure Bulkhead FS1098.2

    57-42-109     A          Slat #3 Attachment

    57-53-101     A, B, C    Outboard Flap Hinge Arms

    57-53-102     A, B, C    Outboard Flap Vane Structure

    57-53-103     A, B, C    Outboard Flap Vane Mounting Structure

    57-53-104     A, B, C    Outboard Flap Box Structure

    57-53-105     A, B, C    Outboard Flap Hinge Arm Support Fittings and
                             Surround Structure

    57-53-108     A, B, D    Outboard Flap Hinge Support Fittings
    ______________________________________________________________________

(j) OTHER FAA 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 to the address identified in paragraph  (k)(2)
    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.

(k) ADDITIONAL INFORMATION

(1) Refer to Transport Canada AD CF-2022-35,  dated June 29, 2022, for re-
    lated information.  This  Transport Canada AD  may be found  in the AD
    docket at regulations.gov under Docket No. FAA-2023-1704.

(2) 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.

(3) Service information identified in this AD  that is not incorporated by
    reference is available at the addresses specified in paragraphs (l)(4)
    and (5) of this AD.

(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) MHI RJ Aviation CRJ550/700/705/900/1000 Maintenance Requirements Manu-
    al (MRM) Part 2, CSP B-053, Revision 26, dated March 25, 2022.

(ii) [Reserved]

(3) For service information identified in this AD, contact MHI RJ Aviation
    Group, Customer Response Center, 3655 Ave des Grandes-Tourelles, Suite
    110, Boisbriand, Qu[eacute]bec J7H 0E2 Canada; North America toll-free
    telephone 833-990-7272 or direct-dial telephone 450-990-7272; fax 514-
    855-8501; email thd.crj@mhirj.com; website mhirj.com.

(4) You may view this service information at the FAA,  Airworthiness Prod-
    ucts 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 February 1, 2024. Victor Wicklund, Deputy Director, Compliance &
Airworthiness Division, Aircraft Certification Service.

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.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2023-1704; Project Identifier MCAI-2022-00866-T;
Amendment 39-22671; AD 2024-03-02]
RIN 2120-AA64

Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate
Previously Held by Bombardier, Inc.) Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
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 (Regional Jet Series 705),
CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet
Series 1000) airplanes. This AD was prompted by a determination that
new or more restrictive airworthiness limitations are necessary. This
AD requires revising the existing maintenance or inspection program, as
applicable, to incorporate new or more restrictive airworthiness
limitations. The FAA is issuing this AD to address the unsafe condition
on these products.

DATES: This AD is effective April 9, 2024.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of April 9,
2024.

ADDRESSES:
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2023-1704; 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 final rule, the mandatory continuing airworthiness
information (MCAI), any comments received, and other information. The
address for Docket Operations is U.S. Department of Transportation,
Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200
New Jersey Avenue SE, Washington, DC 20590.
Material Incorporated by Reference:
For service information identified in this final rule,
contact MHI RJ Aviation Group, Customer Response Center, 3655 Ave. des
Grandes-Tourelles, Suite 110, Boisbriand, Qu[eacute]bec J7H 0E2 Canada;
North America toll-free telephone 833-990-7272 or direct-dial telephone
450-990-7272; fax 514-855-8501; email mhirj.com">thd.crj@mhirj.com; website
mhirj.com.
You may view this service information 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. It is also available at
regulations.gov under Docket No. FAA-2023-1704.

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:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to all 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 (Regional Jet Series 705), CL-600-2D24
(Regional Jet Series 900), and CL-600-2E25 (Regional Jet Series 1000)
airplanes. The NPRM published in the Federal Register on August 8, 2023
(88 FR 53402). The NPRM was prompted by AD CF-2022-35, dated June 29,
2022, issued by Transport Canada, which is the aviation authority for
Canada (referred to after this as the MCAI). The MCAI states that new
or more restrictive airworthiness limitations have been developed.
In the NPRM, the FAA proposed to require revising the existing
maintenance or inspection program, as applicable, to incorporate new or
more restrictive airworthiness limitations. The FAA is issuing this AD
to address cracks in the principal structural elements of the fuselage
and wings. The unsafe condition, if not addressed, could result in
reduced structural integrity of the airplane. You may examine the MCAI
in the AD docket at regulations.gov under Docket No. FAA-2023-1704.

Discussion of Final Airworthiness Directive

Comments

The FAA received a comment from MHI RJ Aviation ULC. The following
presents the comment received on the NPRM and the FAA's response to the
comment.

Request for Credit for Actions Using Previous Revisions of the Service
Information


MHI RJ Aviation ULC requested that the FAA provide credit for
accomplishing the actions specified in paragraph (g) of the proposed AD
prior to the effective date of this AD in accordance with MHI RJ
Aviation CRJ550/700/705/900/1000 Maintenance Requirements Manual (MRM)
Part 2, CSP B-053, Revision 24, dated February 25, 2021; or MHI RJ
Aviation CRJ550/700/705/900/1000 Maintenance Requirements Manual (MRM)
Part 2, CSP B-053, Revision 25, dated June 25, 2021. MHI RJ Aviation
ULC pointed out that some of the tasks were initially introduced or
revised in these revisions and that allowing credit would allow
operators that have already accomplished the actions to avoid the need
to request an alternative method of compliance with paragraph (g) of
the proposed AD.
The FAA agrees to allow credit for the specified revisions for the
reasons provided. Therefore, a new paragraph (i) has been added to this
AD to provide credit for operators that have incorporated the new/
revised tasks into their maintenance program using the specified
revisions. Subsequent paragraphs have been redesignated accordingly.

Conclusion

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 reviewed the
relevant data, considered the comment received, and determined that air
safety requires adopting this AD as proposed. Accordingly, the FAA is
issuing this AD to address the unsafe condition on this product. Except
for minor editorial changes, and any other changes described
previously, this AD is adopted as proposed in the NPRM. None of the
changes will increase the economic burden on any operator.

Related Service Information Under 1 CFR Part 51

The FAA reviewed MHI RJ Aviation CRJ550/700/705/900/1000
Maintenance Requirements Manual (MRM) Part 2, CSP B-053, Revision 26,
dated March 25, 2022. This service information specifies new or revised
tasks to detect cracks in the principal structural elements of the
fuselage and wings. 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.

Costs of Compliance


The FAA estimates that this AD affects 601 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
The FAA has determined that revising the 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


This AD will not have federalism implications under Executive Order
13132. This AD will 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 that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will 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 Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 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: