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PROPOSED AD MHI RJ AVIATION ULC (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.): Docket No. FAA-2022-0388; Project Identifier MCAI-2020-01604-T.
(a) COMMENTS DUE DATE

    The FAA must receive comments on this  airworthiness directive (AD) by
    May 16, 2022.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies  to MHI RJ  Aviation ULC (Type  Certificate Previously
    Held by  Bombardier, Inc.)  airplanes identified  in paragraphs (c)(1)
    through (3) of this AD, certificated in any category.

(1) Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) and CL-600-2C11
    (Regional  Jet Series  550) airplanes,  serial numbers  10002  through
    10325 inclusive.

(2) Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24  (Regional
    Jet  Series  900)  airplanes,  serial  numbers  15001  through   15263
    inclusive.

(3) Model  CL-600-2E25 (Regional  Jet Series  1000), serial  numbers 19001
    through 19013 inclusive.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 28, Fuel system.

(e) UNSAFE CONDITION

    This AD  was prompted  by reports  of the  failure of  certain primary
    ejector fuel feed flexible hoses, which may have a thinner liner  than
    specified by design requirements,  and are therefore more  susceptible
    to cracking. The  FAA is issuing  this AD to  address a possible  fuel
    hose  leak, which  could cause  a lateral  imbalance with  an  adverse
    effect on the airplane's controllability, or result in a dual inflight
    engine shutdown (IFSD).

(f) COMPLIANCE

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

(g) REQUIRED ACTIONS

    At the applicable time specified in figure 1 to paragraph (g) of  this
    AD: Replace each hose having  part number (P/N) CC670-62022-3 and  P/N
    CC670-62022-4  and  serial  number  001  through  2470  inclusive,  in
    accordance  with  Part  B   of  the  Accomplishment  Instructions   of
    Bombardier Service Bulletin 670BA-28-040, dated September 30, 2019.

                 FIGURE 1 TO PARAGRAPH (g) - COMPLIANCE SCHEDULE

(h) 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.  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.

(i) RELATED INFORMATION

(1) Refer to Mandatory Continuing Airworthiness Information (MCAI) TCCA AD
    CF-2020-03, dated March  5, 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-2022-0388.

(2) For more  information about  this AD, contact  Joseph Catanzaro, Aero-
    space Engineer,  Airframe and  Propulsion Section,  FAA, New  York ACO
    Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;  telephone
    516-228-7366; email 9-avs-nyaco-cos@faa.gov.

(3) For Bombardier 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
    telephone  +1-844-272-2720 or  direct-dial telephone  +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  March 25, 2022. Lance T. Gant, Director, Compliance & Airworth-
iness Division, Aircraft Certification Service.

DATES: The FAA must receive comments on this proposed AD by  May 16, 2022.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


14 CFR Part 39

[Docket No. FAA-2022-0388; Project Identifier MCAI-2020-01604-T]
RIN 2120-AA64

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

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain MHI RJ Aviation ULC Model CL-600-2C10 (Regional Jet Series
700, 701 & 702), CL-600-2C11 (Regional Jet Series 550), CL-600-2D15
(Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900), and
CL-600-2E25 (Regional Jet Series 1000) airplanes. This proposed AD was
prompted by reports of the failure of certain primary ejector fuel feed
flexible hoses, which may have a thinner liner than specified by design
requirements, and are therefore more susceptible to cracking. This
proposed AD would require replacing the hoses. 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 May 16, 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 Bombardier service information identified in this NPRM, contact
MHI RJ Aviation ULC, 12655 Henri-Fabre Blvd., Mirabel, Qu[eacute]bec
J7N 1E1 Canada; Widebody Customer Response Center North America toll-
free telephone +1-844-272-2720 or direct-dial telephone +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 at https://www.regulations.gov by
searching for and locating Docket No. FAA-2022-0388; 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: Joseph Catanzaro, Aerospace Engineer,
Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart
Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7366;
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-2022-0388; Project Identifier
MCAI-2020-01604-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
Joseph Catanzaro, Aerospace Engineer, Airframe and Propulsion Section,
FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 516-228-7366; 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-2020-03, dated March 5,
2020 (TCCA AD CF-2020-03) (also 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-600-2C10
(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-2022-0388.

This proposed AD was prompted by reports of the failure of primary
ejector fuel feed flexible hoses with more than 30,000 flight hours,
installed in accordance with Bombardier Service Bulletin 670BA-28-008C,
dated January 23, 2003. In four of the events, the fuel was leaking
inside the center fuel tank from the cracked inner liner of the hose,
and caused a lateral fuel imbalance condition on the airplane. These
events resulted in an emergency descent or air turn back (ATB).
Subsequent investigation determined that hoses with part numbers (P/N)
CC670-62022-3 and CC670-62022-4, and serial numbers 001 through 2470
inclusive, may have a thinner Teflon[supreg] liner than specified by
the design requirements, and therefore are more susceptible to
cracking. Analysis also indicates that, depending on the size of the
crack and the resultant amount of fuel leakage, a fuel supply
disruption to the engines could be significant enough to cause an
inflight engine shutdown (IFSD). The FAA is proposing this AD to
address a possible fuel hose leak, which could cause a lateral
imbalance with an adverse effect on the airplane's controllability, or
could result in a dual IFSD. See the MCAI for additional background
information.

Related Service Information Under 1 CFR Part 51


Bombardier has issued Service Bulletin 670BA-28-040, dated
September 30, 2019. This service information describes procedures for,
among other actions, replacing any primary ejector fuel feed flexible
hose, (P/N) CC670-62022-3 and CC670-62022-4, having serial numbers 001
through 2470 inclusive. 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.

Costs of Compliance


The FAA estimates that this AD, if adopted as proposed, would
affect 457 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
12 work-hours x $85 per hour = $1,020
$2,872
$3,892
$1,778,644

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: