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PROPOSED AD MHI RJ AVIATION ULC (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.): Docket No. FAA-2020-0913; Project Identifier MCAI-2020-00971-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments by November 30, 2020.

(b) AFFECTED ADS

    This AD replaces AD 2015-05-03, Amendment 39-18113 (80 FR 13758, March
    17, 2015) ("AD 2015-05-03").

(c) APPLICABILITY

    This AD applies to MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet
    Series  100 &  440) airplanes,  certificated in  any category,  serial
    numbers 7003 through 7990 inclusive, and 8000 and subsequent.

(d) SUBJECT

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

(e) REASON

    This AD was prompted by  a determination that new or  more restrictive
    airworthiness limitations are necessary, as well as the  corresponding
    structural repairs  and modifications  to preclude  widespread fatigue
    damage (WFD). The FAA is issuing  this AD to address WFD, which  could
    adversely affect the structural integrity of the airplane.

(f) COMPLIANCE

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

(g) RETAINED REVISION OF MAINTENANCE OR INSPECTION PROGRAM,  WITH  CERTAIN
    REQUIREMENTS REMOVED

    This paragraph restates the requirements  of paragraph (g) of AD  2015
    -05-03, with certain requirements removed. Within 60 days after  April
    21, 2015 (the effective date of AD 2015-05-03): Revise the maintenance
    or   inspection   program,  as   applicable,   by  incorporating   the
    airworthiness limitations (AWL)  tasks specified in  paragraphs (g)(1)
    and (2) of this AD. The  initial compliance times for the tasks  start
    from the applicable threshold times specified in Part 2  Airworthiness
    Requirements,  Revision  9,  dated  June  10,  2013,  of  Appendix  B,
    Airworthiness  Limitations,  of  Bombardier  CL-600-2B19,  Maintenance
    Requirements Manual, CSP A-053;  except that, for airplanes  that have
    accumulated more than 38,000 total flight cycles as of April 21, 2015,
    the  initial  compliance  time  for  the  AWL  tasks  is  before   the
    accumulation of 2,000 flight cycles after April 21, 2015.

(1) AWL Task 53-41-110,  Longitudinal Str. 6 splice butt strap  at Str. 6,
    FS409.0 to FS617.0, of Appendix B,  Airworthiness Limitations, of Part
    2, Airworthiness Requirements, Revision 9, dated June 10, 2013, of the
    Bombardier CL-600-2B19, Maintenance Requirements Manual, CSP A-053.

(2) AWL Task 53-41-204, Frame splice angles at STR 6 and 20, of Appendix B
    Airworthiness  Limitations,  of  Part  2,  Airworthiness Requirements,
    Revision  9,  dated  June 10,  2013,  of  the Bombardier  CL-600-2B19,
    Maintenance Requirements Manual, CSP A-053.

(h) RETAINED NO ALTERNATIVE ACTIONS OR INTERVALS, WITH NO CHANGES

    This paragraph restates the requirements  of paragraph (h) of AD  2015
    -05-03, with no changes.  After the 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 or intervals are approved as an alternative  method
    of compliance (AMOC)  in accordance with  the procedures specified  in
    paragraph (n)(1) of this AD.

(i) RETAINED REPAIRS AND MODIFICATIONS, WITH CHANGED PARAGRAPH REFERENCES

    This paragraph restates the requirements  of paragraph (i) of AD  2015
    -05-03, with changed paragraph references. Before the accumulation  of
    60,000  total  flight  cycles: Install  repairs  and  modifications to
    preclude widespread fatigue damage (WFD) at locations specified in the
    tasks identified  in paragraphs  (g)(1) and  (2) of  this AD,  using a
    method  approved  by  the  Manager, New  York  ACO,  ANE-170,  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.

(j) NEW MAINTENANCE OR INSPECTION PROGRAM REVISION

    Within  60  days after  the  effective date  of  this AD,  revise  the
    existing  maintenance  or   inspection  program,  as   applicable,  to
    incorporate  the  information  specified  in  AWL  task  53-41-207, as
    specified in  Bombardier Temporary  Revision 2B-2280,  dated June  12,
    2020. The initial compliance time for  doing the tasks is at the  time
    specified in AWL task 53-41-207, as specified in Bombardier  Temporary
    Revision 2B-2280,  dated June  12, 2020,  or within  60 days after the
    effective date of this AD, whichever occurs later.

(k) NEW NO ALTERNATIVE ACTIONS OR INTERVALS

    After the existing maintenance or inspection program has been  revised
    as required by paragraph (j) of this AD, no alternative actions (e.g.,
    inspections) or intervals may be used unless the actions or  intervals
    are approved as an AMOC in accordance with the procedures specified in
    paragraph (n)(1) of this AD.

(l) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit for the initial inspections required by
    the service  information specified  in paragraph  (j) of  this AD,  if
    those actions  were performed  before the  effective date  of this  AD
    using the  Bombardier Repair  Engineering Orders  (REOs) specified  in
    Figure 1 to paragraph (l) of this AD.

      FIGURE 1 TO PARAGRAPH (L)  REOS EQUIVALENT TO INITIAL INSPECTION   
    ______________________________________________________________________
       AIRPLANE
    SERIAL NUMBER                       BOMBARDIER REO
    ______________________________________________________________________
       7168           601R-53-00-714, Revision --, dated January 30, 2019
       7437           601R-53-00-722, Revision --, dated March 28, 2019
       7574           601R-53-00-725, Revision --, dated June 4, 2019
       7667           601R-53-00-726, Revision --, dated June 4, 2019
       7640           601R-53-00-727, Revision --, dated June 25, 2019
       7636           601R-53-00-728, Revision --, dated June 15, 2019
       7400           601R-53-00-730, Revision --, dated June 20, 2019
       7660           601R-53-00-731, Revision --, dated June 20, 2019
       7638           601R-53-00-732, Revision --, dated June 24, 2019
       7523           601R-53-00-734, Revision --, dated June 25, 2019
       7425           601R-53-00-735, Revision --, dated June 25, 2019
       7568           601R-53-00-737, Revision --, dated July 15, 2019
       7873           601R-53-00-739, Revision --, dated July 15, 2019
       7536           601R-53-00-741, Revision  A, dated July 23, 2019
       7657           601R-53-00-742, Revision --, dated July 23, 2019
       7682           601R-53-00-752, Revision --, dated August 22, 2019
       7656           601R-53-00-753, Revision --, dated August 22, 2019
       7904           601R-53-00-754, Revision --, dated August 26, 2019
       7687           601R-53-00-758, Revision --, dated September 9, 2019
       7879           601R-53-00-762, Revision --, dated November 4, 2019
       7447           601R-53-00-763, Revision --, dated October 30, 2019
       7256           601R-53-00-765, Revision --, dated October 21, 2019
       7663           601R-53-00-767, Revision --, dated November 1, 2019
       7457           601R-53-00-769, Revision --, dated October 29, 2019
       7257           601R-53-00-772, Revision --, dated November 20, 2019
       7569           601R-53-00-777, Revision --, dated December 11, 2019
       7695           601R-53-00-780, Revision --, dated January 6, 2020
       7880           601R-53-00-785, Revision --, dated February 1, 2020
       7490           601R-53-00-787, Revision --, dated February 27, 2020
       7366           601R-53-00-790, Revision --, dated February 26, 2020
       7306           601R-53-00-795, Revision --, dated April 16, 2020
       7479           601R-53-00-797, Revision --, dated June 17, 2020
       7487           601R-53-00-798, Revision --, dated June 17, 2020
    ______________________________________________________________________

(m) NEW REPAIRS AND MODIFICATIONS

    Before the accumulation of 60,000 total flight cycles: Install repairs
    and modifications to preclude WFD at locations specified in the  tasks
    identified in paragraph (j) of this AD, using a method approved by the
    Manager, New York ACO, ANE-170, FAA;  or TCCA; or MHI RJ Aviation  ULC
    's TCCA DAO.  If approved by  the DAO, the  approval must include  the
    DAO-authorized signature.

(n) 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
    local Flight  Standards District  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;
    phone: 516-228-7300; fax: 516-794-5531.

(i) Before using any approved AMOC,  notify your appropriate principal in-
    spector,  or  lacking a principal inspector,  the manager of the local
    flight standards district office/certificate holding district office.

(ii) AMOCs approved previously for AD 2015-05-03,  are  approved  as AMOCs
     for the corresponding provisions of paragraph (g) of this AD.

(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  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.

(o) RELATED INFORMATION

(1) Refer   to   Mandatory  Continuing  Airworthiness  Information  (MCAI)
    Canadian AD CF-2014-07R1 dated July 13, 2020, 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-2020-
    0913.

(2) For more information about this AD,  contact Andrea Jimenez, Aerospace
    Engineer, Airframe and Propulsion Section,  FAA,  New York ACO Branch,
    1600 Stewart Avenue,  Suite 410,  Westbury, NY 11590;  phone: 516-228-
    7330; fax: 516-794-5531; email: 9-avs-nyaco-cos@faa.gov.

(3) For service information identified in this AD, contact MHI RJ Aviation
    ULC, 12655 Henri-Fabre Blvd., Mirabel, Quebec J7N 1E1 Canada; Widebody
    Customer Response Center North America toll-free phone +1-844-272-2720
    or direct-dial phone +1-514-855-8500; fax +1-514-855-8501; 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.

Issued on October 7, 2020. Lance T Gant, Director, Compliance & Airworthi-
ness Division, Aircraft Certification Service.

DATES: The FAA must receive comments  on this proposed AD  by November 30,
2020.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0913; Project Identifier MCAI-2020-00971-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 supersede Airworthiness Directive (AD)
2015-05-03, which applies to certain MHI RJ Aviation ULC Model CL-600-
2B19 (Regional Jet Series 100 & 440) airplanes. AD 2015-05-03 requires
revising the maintenance or inspection program, as applicable, to
incorporate new or revised maintenance requirements and airworthiness
limitations, and incorporating structural repairs and modifications to
preclude widespread fatigue damage (WFD). Since the FAA issued AD 2015-
05-03, the FAA has determined that new or more restrictive
airworthiness limitations are necessary, as well as the corresponding
structural repairs and modifications to preclude WFD. This proposed AD
would require revising the existing maintenance or inspection program,
as applicable, to incorporate new or more restrictive airworthiness
limitations and would require incorporating structural repairs and
modifications to preclude WFD. 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 November
30, 2020.

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 ULC, 12655 Henri-Fabre Blvd., Mirabel, Quebec J7N 1E1
Canada; Widebody Customer Response Center North America toll-free
phone: +1-844-272-2720 or direct-dial phone: +1-514-855-8500; fax: +1-
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 on the internet at https://www.regulations.
gov by searching for and locating Docket No. FAA-2020-0913;
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. Comments will be
available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Andrea Jimenez, Aerospace Engineer,
Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart
Avenue, Suite 410, Westbury, NY 11590; phone: 516-228-7330; fax: 516-
794-5531; 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 the ADDRESSES section. Include "Docket No. FAA-2020-0913;
Project Identifier MCAI-2020-00971-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 proposed AD.

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
Andrea Jimenez, Aerospace Engineer, Airframe and Propulsion Section,
FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; phone: 516-228-7330; fax: 516-794-5531; 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.

Discussion

The FAA issued AD 2015-05-03, Amendment 39-18113 (80 FR 13758,
March 17, 2015) ("AD 2015-05-03"), for certain MHI RJ Aviation ULC
Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. AD 2015-
05-03 requires revising the maintenance or inspection program, as
applicable, to incorporate new or revised maintenance requirements and
airworthiness limitations, and incorporating structural repairs and
modifications to preclude WFD. AD 2015-05-03 resulted from reports of
cracking on the skin panels and skin splice joints and angles at
certain stringers at various locations between certain fuselage
stations. The FAA issued AD 2015-05-03 to address WFD, which could
adversely affect the structural integrity of the airplane.

Actions Since AD 2015-05-03 Was Issued

Since the FAA issued AD 2015-05-03, the FAA has determined that new
or more restrictive airworthiness limitations are necessary, as well as
the corresponding structural repairs and modifications to preclude WFD.

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian AD CF-2014-07R1, dated July
13, 2020 (referred to after this as the Mandatory Continuing
Airworthiness Information, or "the MCAI"), to correct an unsafe
condition for certain MHI RJ Aviation ULC Model CL-600-2B19 (Regional
Jet Series 100 & 440) airplanes. You may examine the MCAI in the AD
docket on the internet at https://www.regulations.gov by searching for
and locating Docket No. FAA-2020-0913.

This proposed AD was prompted by a determination that new or more
restrictive airworthiness limitations are necessary, as well as the
corresponding structural repairs and modifications to preclude WFD. The
manufacturer discovered inconsistencies between the Engineering
Structure Reports and Maintenance Tasks for the inspection of fuselage
skin longitudinal splices along a certain stringer. The FAA is
proposing this AD to address WFD, which could adversely affect the
structural integrity of the airplane. See the MCAI for additional
background information.

Related Service Information Under 1 CFR Part 51

MHI RJ Aviation has issued Bombardier Temporary Revision 2B-2280,
dated June 12, 2020. This service information, among other actions,
describes airworthiness limitation (AWL) task 53-41-207, which
specifies airworthiness limitations and inspections for fuselage and
longitudinal skin splices at stringer (STR) 6 and 20.

This proposed AD would also require the following service
information, which the Director of the Federal Register approved for
incorporation by reference as of April 21, 2015 (80 FR 13758, March 17,
2015).

AWL Task 53-41-110, Longitudinal Str. 6 splice butt strap
at Str. 6, FS409.0 to FS617.0, of Appendix B, Airworthiness
Limitations, of Part 2, Airworthiness Requirements, Revision 9, dated
June 10, 2013, of the Bombardier CL-600-2B19 Maintenance Requirements
Manual, CSP A-053.

AWL Task 53-41-204, Frame splice angles at STR 6 and 20,
of Appendix B, Airworthiness Limitations, of Part 2, Airworthiness
Requirements, Revision 9, dated June 10, 2013, of the Bombardier CL-
600-2B19 Maintenance Requirements Manual, CSP A-053.

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 Requirements of This NPRM

This proposed AD would retain certain requirements of AD 2015-05-03.
This proposed AD would require revising the existing maintenance or
inspection program, as applicable, to incorporate new or more
restrictive airworthiness limitations and would require incorporating
structural repairs and modifications to preclude WFD.

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 according to paragraph
(n)(1) of this proposed AD.

Costs of Compliance

The FAA estimates that this proposed AD affects 431 airplanes of
U.S. registry. The FAA estimates the following costs to comply with
this proposed AD:

The FAA estimates the total cost per operator for the retained
actions from AD 2015-05-03 to be $7,650 (90 work-hours x $85 per work-
hour).

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.
In the past, the agency has estimated that this action takes 1 work-
hour per airplane. 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).

The FAA has received no definitive data that would enable us to
provide cost estimates for the repairs and modifications 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) 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 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:

a. Removing Airworthiness Directive (AD) 2015-05-03, Amendment 39-18113
(80 FR 13758, March 17, 2015); and

b. Adding the following new AD: