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PROPOSED AD MHI RJ AVIATION ULC (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.): Docket No. FAA-2022-0885; Project Identifier MCAI-2021-01429-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this airworthiness directive (AD)  by
    September 6, 2022.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies  to  all  MHI RJ Aviation ULC airplanes identified in
    paragraphs (c)(1) through (5) of this AD certificated in any category.

(1) Model CL-600-2C10 (Regional Jet Series 700, 701, & 702).

(2) Model CL-600-2C11 (Regional Jet Series 550).

(3) Model CL-600-2D15 (Regional Jet Series 705).

(4) Model CL-600-2D24 (Regional Jet Series 900).

(5) Model CL-600-2E25 (Regional Jet Series 1000) airplanes.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 32, Landing gear.

(e) UNSAFE CONDITION

    This AD was prompted by reports  that the landing gear age of  certain
    airplanes  was higher  than expected  for gear  overhaul.  The  FAA is
    issuing this AD to address the possibility of undetected corrosion due
    to landing gear age that could lead to main landing gear (MLG)  and/or
    nose  landing  gear  (NLG)  collapse,  and  consequent  damage  to the
    airplane and injury to the occupants.

(f) COMPLIANCE

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

(g) DETERMINATION OF COMPONENT CALENDAR AGE

    Within 90 days after the effective date of this AD:  Verify  the  air-
    plane and / or the airplane technical records to determine whether any
    MLG and NLG components are affected components based on their calendar
    age, in accordance with Section 2,  Part A,  of the Accomplishment In-
    structions of MHI RJ Service Bulletin  (SB) 670BA-32-062,  Revision A,
    dated December 2, 2021.

(h) REMOVAL AND REPLACEMENT OF AFFECTED NLG COMPONENTS

(1) Within the applicable  compliance time indicated  in figure 1 to para-
    graph (h) of this AD: Remove the affected NLG components identified in
    paragraph (g) of this AD in accordance with Section 2,  Part B, of the
    Accomplishment  Instructions  of  MHI RJ SB 670BA-32-062,  Revision A,
    dated December 2, 2021.

(2) Before further flight  after removal  of the affected components,  re-
    place the removed components  with serviceable components,  in accord-
    ance with Section 2, Part D, of the Accomplishment Instructions of MHI
    RJ SB 670BA-32-062, Revision A, dated December 2, 2021.

                  FIGURE 1 TO PARAGRAPH (H) – COMPLIANCE TIME
    ______________________________________________________________________
    COMPONENT CALENDAR AGE                    COMPLIANCE TIME
    ______________________________________________________________________
    Less than 10 years              Prior to reaching 12 years’ component
                                    calendar age or within 36 months after
                                    the effective date of this AD, which-
                                    ever occurs later

    10 years or more and            Within 36 months after the effective
    less than 12 years              date of this AD or prior to reaching
                                    14 years’ component calendar age,
                                    whichever occurs first

    12 years or more and            Prior to reaching 14 years’ component
    less than 13 years              calendar age

    13 years or more and            Within 12 months after the effective
    less than 14 years              date of this AD

    14 years or more                Within 6 months after the effective
                                    date of this AD
    ______________________________________________________________________

(i) REMOVAL AND REPLACEMENT OF AFFECTED MLG COMPONENTS

(1) Within the applicable  compliance time  indicated in figure 1 to para-
    graph (h) of this AD: Remove the affected MLG components identified in
    paragraph (g) of this AD  in accordance with Section 2 Part E or H, as
    applicable,  of the Accomplishment Instructions of MHI RJ SB 670BA-32-
    062, Revision A, dated December 2, 2021.

(2) Before further flight after removing the affected components,  replace
    the removed components with serviceable components, in accordance with
    Section 2, Part G or J, as applicable,  of the Accomplishment Instruc-
    tions of MHI RJ SB 670BA-32-062, Revision A, dated December 2, 2021.

(k) PARTS INSTALLATION LIMITATION

(1) As of the effective date of this AD, no person may install on any air-
    plane, any MLG  or  NLG component  with a calendar age of 12 years  or
    more unless it has been overhauled  in accordance  with Section 2 Part
    C, F, or I,  as applicable,  of the Accomplishment Instructions of MHI
    RJ SB 670BA-32-062, Revision A, dated December 2, 2021.

(2) As of the effective date of this AD,  any MLG or NLG component  with a
    calendar age of less than 12  years may be installed on any  airplane,
    provided it is overhauled in accordance  with Section 2 Part C, F,  or
    I, as  applicable, of  the Accomplishment  Instructions of  MHI RJ  SB
    670BA-32-062, Revision A, dated December 2, 2021, prior to reaching 12
    years' component calendar age.

(l) OTHER FAA 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 certification office,  send
    it to ATTN: Program  Manager, Continuing Operational Safety,  FAA, New
    York ACO Branch, 1600 Stewart  Avenue, Suite 410, Westbury, NY  11590;
    telephone 516-228-7300;  fax 516-794-5531.  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 MHI  RJ
    Aviation ULC's TCCA Design Approval Organization (DAO). If approved by
    the DAO, the approval must include the DAO-authorized signature.

(m) RELATED INFORMATION

(1) Refer to Mandatory Continuing Airworthiness Information (MCAI) TCCA AD
    CF-2021-49 dated December 20, 2021, for related information. This MCAI
    may be found  in  the  AD  docket  on  the  internet  at  https://www.
    regulations.gov by searching  for  and  locating  Docket No. FAA-2022-
    0885.

(2) For more information about this AD contact Antariksh Shetty, 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.

(3) For service information identified in this AD, contact MHI RJ Aviation
    Group,  Customer  Response  Center, 3655 Ave. des Grandes - Tourelles,
    Suite 110, Boisbriand, Quebec 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; internet https://mhirj.com. You may
    view this service information at the FAA,  Airworthiness Products Sec-
    tion, 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.

Issued on July 15, 2022. Gaetano A. Sciortino, Deputy Director for Strate-
gic Initiatives,  Compliance & Airworthiness Division, Aircraft Certifica-
tion Service.

DATES: The FAA must receive comments  on this proposed AD  by September 6,
2022.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-0885; Project Identifier MCAI-2021-01429-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 all 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); CL-600-2D24 (Regional Jet Series 900); and
CL-600-2E25 (Regional Jet Series 1000) airplanes. This proposed AD was
prompted by reports that the landing gear age of certain airplanes was
higher than expected for gear overhaul, which could increase the risk
of corrosion. This proposed AD would require verifying the calendar age
of the nose landing gear (NLG) and main landing gear (MLG) by way of
component maintenance documents, and performing corrective actions if
necessary. This proposed AD would also prohibit installing certain
components. 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 September
6, 2022.

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 https://www.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.
For service information identified in this NPRM, 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; internet https://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.

Examining the AD Docket

You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2022-0885; 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, any comments
received, and other information. The street address for Docket
Operations is listed above.

FOR FURTHER INFORMATION CONTACT: Antariksh Shetty, 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-2022-0885; Project Identifier
MCAI-2021-01429-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
https://www.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
Antariksh Shetty, 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-2021-49, dated December 20,
2021 (TCCA AD CF-2021-49) (also referred to after this as the Mandatory
Continuing Airworthiness Information, or the MCAI), to correct an
unsafe condition for all 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); CL-600-2D24 (Regional Jet
Series 900); and CL-600-2E25 (Regional Jet Series 1000) airplanes. You
may examine the MCAI in the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2022-0885.
This proposed AD was prompted by reports that the landing gear age
of certain airplanes was higher than expected for gear overhaul. The
FAA is proposing this AD to address the possibility of undetected
corrosion due to landing gear age that could lead to MLG and/or NLG
collapse, and consequent damage to the airplane and injury to the
occupants. See the MCAI for additional background information.

Related Service Information Under 1 CFR Part 51

MHI RJ has issued SB 670BA-32-062, dated December 2, 2021. This
service information describes procedures for, among other actions,
verifying the calendar age of the NLG and MLG by way of component
maintenance documents and for removing affected landing gear components
and replacing them with serviceable components.
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 the State of Design Authority,
the FAA has been notified of the unsafe condition described in the MCAI
and service information referenced above. The FAA is proposing this AD
because the FAA evaluated all the relevant information and determined
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 except as discussed under
``Differences Between this Proposed AD and the MCAI.'' This proposed AD
would also prohibit installing certain affected parts.

Differences Between This Proposed AD and the MCAI

TCCA AD CF-2021-49 requires the replacement of affected components
with a calendar age of 10 years or more. However, this proposed AD also
includes affected components with a calendar age of less than 10 years.
MHI RJ Aviation ULC intends to revise Part 1 of the maintenance
requirements manual (MRM) for the affected components to include a
calendar age life limit in addition to the existing flight cycle life
limit. TCCA then plans to issue an AD to enforce the calendar age life
limit in the revised MRM, which would address the unsafe condition for
components with a calendar age of less than 10 years for Canadian
operators. However, for U.S. operators, affected components with a
calendar age of less than 10 years may reach the new calendar age life
limit before an FAA AD is issued to mandate the revised MRM once it is
available. Therefore, components with a calendar age of less than 10
years are included in this proposed AD.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 624 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
4 work-hours x $85 per hour = $340
$0
$340
$212,160

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

Labor cost
Parts cost
Cost per product
Up to 32 work-hours x $85 per hour = Up to $2,720
Up to $340,000
Up to $342,720

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: