[Federal Register Volume 88, Number 94 (Tuesday, May 16, 2023)]
[Rules and Regulations]
[Pages 31154-31159]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-10334]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-1474; Project Identifier MCAI-2022-00888-T; 
Amendment 39-22409; AD 2023-07-07]
RIN 2120-AA64


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

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Final rule.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for 
certain MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet Series 100 
& 440), 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 reports from the 
supplier that sensing elements of the bleed air leak detection system 
were manufactured with insufficient salt fill, which can result in an 
inability to detect hot bleed air leaks. This AD requires testing of 
all affected overheat detection sensing elements of the bleed air leak 
detection system, and replacement if necessary. This AD also prohibits 
the installation of affected parts. The FAA is issuing this AD to 
address the unsafe condition on these products.

DATES: This AD is effective June 20, 2023.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of June 20, 
2023.

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2022-1474; 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

[[Page 31155]]

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 St., 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-2022-1474.

FOR FURTHER INFORMATION CONTACT: Thomas Niczky, Aerospace Engineer, 
Avionics & Electrical Systems Section, FAA, New York ACO Branch, 1600 
Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7347; 
email [email protected].

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 certain MHI RJ Aviation 
ULC Model CL-600-2B19 (Regional Jet Series 100 & 440), 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 November 18, 2022 (87 FR 
69210). The NPRM was prompted by AD CF-2022-16R1, dated July 5, 2022, 
issued by Transport Canada, which is the aviation authority for Canada 
(referred to after this as the MCAI). The MCAI states that MHI RJ 
Aviation ULC received reports from the supplier of the overheat 
detection sensing elements of a manufacturing quality escape. Some of 
the sensing elements of the bleed air leak detection system were 
manufactured with insufficient salt fill, which can result in an 
inability to detect hot bleed air leaks and cause damage to surrounding 
structures and systems that can prevent continued safe flight and 
landing.
    In the NPRM, the FAA proposed to require testing of all affected 
overheat detection sensing elements of the bleed air leak detection 
system, and replacement if necessary. The NPRM also proposed to 
prohibit the installation of affected parts. The FAA is issuing 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-2022-1474.

Discussion of Final Airworthiness Directive

Comments

    The FAA received a comment from the Air Line Pilots Association, 
International (ALPA), who supported the NPRM without change.
    The FAA received additional comments from two commenters, including 
Endeavor Air and MHI RJ Aviation ULC. The following presents the 
comments received on the NPRM and the FAA's response to each comment.

Request To Not Require Recording of Serial Number and Date Code

    Endeavor Air requested that paragraph (h) of the proposed AD be 
revised to not require recording of the sensing element serial number 
and date code if not visible, unless the sensing element has failed. 
Endeavor Air noted that the service information specifies to fill out a 
data sheet for each sensing element and include it with each failed 
sensing element, and the data sheet specifies to include the serial 
number and date code of the sensing element. Endeavor Air noted that 
obtaining the serial number and date code sometimes requires 
disassembly of adjacent structure or components, which takes up to two 
labor hours per sensing element. The commenter asserted that the cost 
of two additional labor hours for the sole purpose of recording 
information on a serviceable sensing element constitutes an undue 
burden on the operator.
    The FAA agrees to remove the requirement to record the sensing 
element serial number and date code if they are not visible without 
additional disassembly, provided that the part has not failed. However, 
the Sensing Element Name must be recorded on the Test Data Sheet, so it 
is clear exactly the sensing element that was tested. Paragraph (h) of 
this AD has been revised to provide an exception to this requirement.

Request To Allow Alternative Installation of Placard

    Endeavor Air requested that paragraphs (j)(1)(iii) and (j)(2)(iii) 
of the proposed AD be revised to allow the placard on the BLEED AIR 
control panel to be installed as specified in the FAA-approved operator 
Minimum Equipment List (MEL) procedure, rather than just in accordance 
with MHI RJ Service Bulletin 670BA-36-025, Revision C, dated May 25, 
2022. Endeavor Air stated that its current MEL procedure for an 
inoperative LOOP already requires installation of a placard on the 
BLEED Air control panel, though the wording is not identical to that in 
MHI RJ Service Bulletin 670BA-36-025, Revision C, dated May 25, 2022. 
Endeavor Air stated that this change would help prevent worker 
confusion and possible unnecessary work.
    The FAA has reviewed Endeavor Air's MEL procedure and agrees that 
it provides the same level of safety as that specified in MHI RJ 
Service Bulletin 670BA-36-025, Revision C, dated May 25, 2022, 
including Appendix A, Revision B, dated March 14, 2022, Appendix B, 
dated October 21, 2021, and Appendix C, dated March 14, 2022. The FAA 
has revised paragraphs (j)(1)(iii) and (j)(2)(iii) of this AD to allow 
installing the placard in accordance with the referenced service 
information or the operator's FAA-approved MEL procedure.

Request To Revise Labor Costs

    MHI RJ requested to revise the labor costs in the cost of 
compliance section from $85 to $79 per hour. MHI RJ stated that 
settlement agreements signed with Liebherr and Kidde are for no more 
than $79 per hour, and that operators will be reimbursed for parts and 
labor costs by Kidde. Therefore, MH IRJ requested the labor cost be 
based on $79 per hour.
    The FAA acknowledges that labor costs may be higher or lower than 
the standard rate of $85 per hour used when estimating the labor costs 
for complying with AD requirements. However, as stated in this AD, 
these costs are merely FAA estimates. Further, the FAA does not control 
any settlement agreement or warranty coverage and cannot guarantee that 
any given labor rate will be available to operators. This AD has not 
been changed with respect to this request.

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 
comments 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.

[[Page 31156]]

Related Service Information Under 1 CFR Part 51

    The FAA reviewed MHI RJ Service Bulletin 601R-36-021, Revision D, 
dated May 25, 2022, including Appendix A, Revision B, dated March 14, 
2022; and MHI RJ Service Bulletin 670BA-36-025, Revision C, dated May 
25, 2022, including Appendix A, Revision B, dated March 14, 2022, 
Appendix B, dated October 21, 2021, and Appendix C, dated March 14, 
2022. This service information specifies procedures for testing 
affected bleed air leak detection system sensing elements (i.e., those 
marked with a date code before ``A2105'' (which corresponds to January 
31, 2021), with a part number defined in this service information) to 
determine if they are serviceable, and replacing failed sensing 
elements with serviceable ones. This service information also allows 
deferring the replacement of an affected part under certain conditions 
and allows operating the airplane with certain deactivated defective 
sensing elements. These documents are distinct since they apply to 
different airplane models. 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 1,126 airplanes of U.S. 
registry. The FAA estimates the following costs to comply with this AD:

                                      Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                 Model                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Model CL[dash]600[dash]2B19 (526        29 work hours x $85 per               $0          $2,465      $1,296,590
 airplanes).                             hour = $2,465.
Model CL[dash]600[dash]2C10 and         82 work hours x $85 per                0           6,970       4,182,000
 CL[dash]600[dash]2C11,                  hour = $6,970.
 CL[dash]600[dash]2D15 and
 CL[dash]600[dash]2D24, and
 CL[dash]600[dash]2E25 (600 airplanes).
----------------------------------------------------------------------------------------------------------------

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

                                     Estimated Costs of On-Condition Actions
----------------------------------------------------------------------------------------------------------------
      Model/serial No.s (S/Ns)                Labor cost                Parts cost           Cost per product
----------------------------------------------------------------------------------------------------------------
CL[dash]600[dash]2B19, S/Ns 7002-    Up to 26 work-hours x $85    Up to $113,200........  Up to $115,410.
 7323.                                per hour = $2,210.
CL-600-2B19, S/Ns 7324-8113........  Up to 24 work-hours x $85    Up to $100,598........  Up to $102,638.
                                      per hour = $2,040.
CL[dash]600[dash]2C10 and            Up to 54 work-hours x $85    Up to $70,758.........  Up to $75,348.
 CL[dash]600[dash]2C11, S/Ns 10002-   per hour = $4,590.
 10347.
CL[dash]600[dash]2D15 and            Up to 58 work-hours x $85    Up to $74,598.........  Up to $79,528.
 CL[dash]600[dash]2D24, S/Ns 15001-   per hour = $4,930.
 15494.
CL[dash]600[dash]2E25, S/Ns 19001-   Up to 62 work-hours times;   Up to $81,478.........  Up to $86,748.
 19064.                               $85 per hour = $5,270.
----------------------------------------------------------------------------------------------------------------

    The FAA has included all known costs in its cost estimate. 
According to the manufacturer, however, some or all of the costs of 
this AD may be covered under warranty, thereby reducing the cost impact 
on affected operators.

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

0
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]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive:


[[Page 31157]]


2023-07-07 MHI RJ Aviation ULC (Type Certificate Previously Held by 
Bombardier, Inc.): Amendment 39-22409; Docket No. FAA-2022-1474; 
Project Identifier MCAI-2022-00888-T.

(a) Effective Date

    This airworthiness directive (AD) is effective June 20, 2023.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to MHI RJ Aviation ULC airplanes, certificated 
in any category, and identified in paragraphs (c)(1) through (4) of 
this AD.
    (1) Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, 
serial numbers 7002 through 7990 inclusive, and 8000 through 8113 
inclusive.
    (2) Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) and 
CL-600-2C11 (Regional Jet Series 550) airplanes, serial numbers 
10002 through 10347 inclusive.
    (3) Model CL-600-2D15 (Regional Jet Series 705) and Model CL-
600-2D24 (Regional Jet Series 900) airplanes, serial numbers 15001 
through 15494 inclusive.
    (4) Model CL-600-2E25 (Regional Jet Series 1000), serial numbers 
19001 through 19064 inclusive.

(d) Subject

    Air Transport Association (ATA) of America Code 36, Pneumatic.

(e) Unsafe Condition

    This AD was prompted by reports that sensing elements of the 
bleed air leak detection system were manufactured with insufficient 
salt fill. The FAA is issuing this AD to address insufficient salt 
fill, which can result in an inability to detect hot bleed air 
leaks, which can cause damage to surrounding structures and systems 
that can prevent continued safe flight and landing.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Definitions

    For the purposes of this AD, the definitions specified in 
paragraphs (g)(1) through (4) of this AD apply.
    (1) Group 1 airplanes: The airplanes identified in paragraph 
(c)(1) of this AD.
    (2) Group 2 airplanes: The airplanes identified in paragraphs 
(c)(2) through (4) of this AD.
    (3) Affected part: A sensing element marked with a date code 
before A2105 and having a part number as defined in Section 1, 
Paragraph G(1), of MHI RJ Service Bulletin 601R-36-021, Revision D, 
dated May 25, 2022, including Appendix A, Revision B, dated March 
14, 2022, for Group 1 airplanes; and in Appendix B, dated October 
21, 2021, of MHI RJ Service Bulletin 670BA-36-025, Revision C, dated 
May 25, 2022, including Appendix A, Revision B, dated March 14, 
2022, and Appendix C, dated March 14, 2022, for Group 2 airplanes; 
unless the sensing element has been tested and found to be 
serviceable in accordance with paragraphs (g)(3)(i) and (ii) or 
paragraph (h) of this AD.
    (i) Has been tested as specified in Section 3 of the 
Accomplishment Instructions of Kidde Aerospace and Defense Service 
Bulletin CFD-26-5 and found to be serviceable; and
    (ii) Has been marked on one face of its connector hex nut and is 
packaged as specified in Section 3.C. of the Accomplishment 
Instructions--Identification Procedure of the Kidde Aerospace and 
Defense Service Bulletin CFD-26-5.
    (4) Serviceable part: A sensing element that is not an affected 
part.

(h) Testing

    Perform a test of the bleed air leak detection system sensing 
elements to determine if they are serviceable, in accordance with 
Section 2, Part A through Part F, of the Accomplishment Instructions 
of MHI RJ Service Bulletin 601R-36-021, Revision D, dated May 25, 
2022, including Appendix A, Revision B, dated March 14, 2022, for 
Group 1 airplanes; and Section 2, Part A through Part M, of the 
Accomplishment Instructions of MHI RJ Service Bulletin 670BA-36-025, 
Revision C, dated May 25, 2022, including Appendix A, Revision B, 
dated March 14, 2022, Appendix B, dated October 21, 2021, and 
Appendix C, dated March 14, 2022, for Group 2 airplanes; within the 
applicable compliance time indicated in figure 1 to paragraph (h) of 
this AD. This AD does not require filling out the serial number or 
date code of the sensing element in Appendix A, Revision B, dated 
March 14, 2022; of MHI RJ Service Bulletin 601R-36-021, Revision D, 
dated May 25, 2022; or MHI RJ Service Bulletin 670BA-36-025, 
Revision C, dated May 25, 2022, including Appendix B, dated October 
21, 2021, and Appendix C, dated March 14, 2022; as applicable, if 
the serial number or date code is not visible without additional 
disassembly and the part has not failed. However, the Sensing 
Element Name must be recorded on the Test Data Sheet, so it is clear 
exactly the sensing element that was tested.

Figure 1 to Paragraph (h)--Compliance Time

[[Page 31158]]

[GRAPHIC] [TIFF OMITTED] TR16MY23.001

(i) Replacement

    (1) For Group 1 airplanes: If any sensing element is found not 
serviceable during the tests required by paragraph (h) of this AD, 
before further flight, replace the sensing element with a 
serviceable part in accordance with Section 2, Part A through Part 
F, as applicable, of the Accomplishment Instructions of MHI RJ 
Service Bulletin 601R-36-021, Revision D, dated May 25, 2022, 
including Appendix A, Revision B, dated March 14, 2022.
    (2) For Group 2 airplanes: If any sensing element is found not 
serviceable during the tests required by paragraph (h) of this AD, 
before further flight, unless deferred in accordance with paragraph 
(j) of this AD, replace the sensing element with a serviceable part 
in accordance with Section 2, Part A through Part M, as applicable, 
of the Accomplishment Instructions of MHI RJ Service Bulletin 670BA-
36-025, Revision C, dated May 25, 2022, including Appendix A, 
Revision B, dated March 14, 2022, Appendix B, dated October 21, 
2021, and Appendix C, dated March 14, 2022.

(j) Deferred Replacement for Group 2 Airplanes

    The replacement of an affected part with a serviceable part for 
Group 2 airplanes, as required by paragraph (i)(2) of this AD, may 
be deferred up to a maximum of 10 days under the conditions 
specified in paragraphs (j)(1) or (2) of this AD.
    (1) A single bleed air leak detection loop (loop A or loop B) 
sensing element for a given Part (Part A through Part M of the 
Accomplishment Instructions of MHI RJ Service Bulletin 670BA-36-025, 
Revision C, dated May 25, 2022, including Appendix A, Revision B, 
dated March 14, 2022, Appendix B, dated October 21, 2021, and 
Appendix C, dated March 14, 2022) is found not serviceable, provided 
that the conditions specified in paragraphs (j)(1)(i) through (iv) 
of this AD have been satisfied.
    (i) The remaining operative bleed air leak detection loop (loop 
A or loop B) sensing elements have been tested and found to be 
serviceable in accordance with paragraph (h) of this AD.
    (ii) The applicable maintenance procedures of Appendix C, dated 
March 14, 2022, of MHI RJ Service Bulletin 670BA-36-025, Revision C, 
dated May 25, 2022, including Appendix A, Revision B, dated March 
14, 2022, and Appendix B, dated October 21, 2021, to deactivate the 
defective sensing element are accomplished prior to operation of the 
airplane with the defective sensing element inoperative.
    (iii) A placard has been installed on the BLEED AIR control 
panel in accordance with Section 2, Part A through Part M, as 
applicable, of the Accomplishment Instructions of MHI RJ Service 
Bulletin 670BA-36-025, Revision C, dated May 25, 2022, including 
Appendix A, Revision B, dated March 14, 2022, Appendix B, dated 
October 21, 2021, and Appendix C, dated March 14, 2022; or in 
accordance with the operator's FAA-approved Minimum Equipment List 
(MEL) procedure.
    (iv) All flightcrew have been advised that the airplane is 
dispatched with one out of two bleed air leak detection loops 
inoperative.
    (2) Both bleed air leak detection loop A and loop B sensing 
elements for a given part (Part A through Part M of the 
Accomplishment Instructions of MHI RJ Service Bulletin 670BA-36-025, 
Revision C, dated May 25, 2022, including Appendix A, Revision B, 
dated March 14, 2022, Appendix B, dated October 21, 2021, and 
Appendix C, dated March 14, 2022) are found not

[[Page 31159]]

serviceable, provided that the conditions specified in paragraphs 
(j)(2)(i) through (iv) of this AD have been satisfied.
    (i) The applicable maintenance procedures of Appendix C, dated 
March 14, 2022, of MHI RJ Service Bulletin 670BA-36-025, Revision C, 
dated May 25, 2022, including Appendix A, Revision B, dated March 
14, 2022, and Appendix B, dated October 21, 2021, to deactivate the 
defective sensing elements are accomplished prior to operation of 
the airplane with the defective sensing elements inoperative.
    (ii) The applicable instructions and limitations of the 
operator's existing FAA-approved Minimum Equipment List (MEL) item 
36-21-06, sub-item 1, 2, or 3, as applicable, in accordance with 
Section 2, Part A through Part M, of the Accomplishment Instructions 
of MHI RJ Service Bulletin 670BA-36-025, Revision C, dated May 25, 
2022, including Appendix A, Revision B, dated March 14, 2022, 
Appendix B, dated October 21, 2021, and Appendix C, dated March 14, 
2022, are accomplished prior to operation of the airplane with the 
defective sensing elements inoperative.
    (iii) A placard has been installed on the BLEED AIR control 
panel in accordance with Section 2, Part A through Part M, as 
applicable, of the Accomplishment Instructions of MHI RJ Service 
Bulletin 670BA-36-025, Revision C, dated May 25, 2022, including 
Appendix A, Revision B, dated March 14, 2022, Appendix B, dated 
October 21, 2021, and Appendix C, dated March 14, 2022; or in 
accordance with the operator's FAA-approved MEL procedure.
    (iv) All flightcrew have been advised that the airplane is 
dispatched with both bleed air leak detection loops inoperative.

(k) Parts Installation Prohibition

    As of the effective date of this AD, no person may install an 
affected part on any airplane.

(l) Credit for Previous Actions

    This paragraph provides credit for actions required by 
paragraphs (h), (i), and (j) of this AD, if those actions were 
performed before the effective date of this AD using the service 
information specified in paragraphs (l)(1) and (2) of this AD. For 
performing the actions specified in the service information for the 
Group 1 airplanes: If the sensing element was found not serviceable, 
replacement is required before further flight; deferred replacement 
of an affected part is prohibited. For performing the actions 
specified in the service information for the Group 2 airplanes: If 
the sensing element was found not serviceable, deferred replacement 
of the affected part is acceptable, as specified in paragraph (j) of 
this AD.
    (1) For Group 1 airplanes the applicable service information 
specified in paragraphs (l)(1)(i) through (iv) of this AD:
    (i) MHI RJ Service Bulletin 601R-36-021, including Appendix A, 
dated July 5, 2021.
    (ii) MHI RJ Service Bulletin 601R-36-021, including Appendix A, 
Revision A, dated October 21, 2021.
    (iii) MHI RJ Service Bulletin 601R-36-021, Revision B, dated 
December 2, 2021, including Appendix A, Revision A, dated October 
21, 2021.
    (iv) MHI RJ Service Bulletin 601R-36-021, Revision C, dated 
March 14, 2022, including Appendix A, Revision B, dated March 14, 
2022.
    (2) For Group 2 airplanes the applicable service information 
specified in paragraphs (l)(2)(i) through (iii) of this AD:
    (i) MHI RJ Service Bulletin 670BA-36-025, including Appendix A, 
dated July 5, 2021.
    (ii) MHI RJ Service Bulletin 670BA-36-025, Revision A, dated 
October 21, 2021, including Appendix A, Revision A, dated October 
21, 2021, and Appendix B, dated October 21, 2021.
    (iii) MHI RJ Service Bulletin 670BA-36-025, Revision B, dated 
March 14, 2022, including Appendix A, Revision B, dated March 14, 
2022, Appendix B, dated October 21, 2021, and Appendix C, dated 
March 14, 2022.

(m) 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 (n)(2) of this AD or 
email to: [email protected]. 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; 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.

(n) Additional Information

    (1) Refer to Transport Canada AD CF-2022-16R1, dated July 5, 
2022, for related information. This Transport Canada AD may be found 
in the AD docket at regulations.gov under Docket No. FAA-2022-1474.
    (2) For more information about this AD, contact Thomas Niczky, 
Aerospace Engineer, Avionics & Electrical Systems Section, FAA, New 
York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
telephone 516-228-7347; email [email protected].

(o) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference 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 Service Bulletin 601R-36-021, Revision D, dated May 
25, 2022, including Appendix A, Revision B, dated March 14, 2022.
    (ii) MHI RJ Service Bulletin 670BA-36-025, Revision C, dated May 
25, 2022, including Appendix A, Revision B, dated March 14, 2022, 
Appendix B, dated October 21, 2021, and Appendix C, dated March 14, 
2022.
    (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 mhirj.com">thd.crj@mhirj.com; 
website mhirj.com.
    (4) 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.
    (5) You may view this service information that is incorporated 
by reference at the National Archives and Records Administration 
(NARA). For information on the availability of this material at 
NARA, email [email protected], or go to: www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on April 8, 2023.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2023-10334 Filed 5-15-23; 8:45 am]
BILLING CODE 4910-13-P