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2022-26-04 MHI RJ AVIATION ULC (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.): Amendment 39-22283; Docket No. FAA-2022-0141; Project Identifier MCAI-2021-01052-T.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective February 2, 2023.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to all MHI RJ Aviation ULC (Type Certificate Previous-
    ly Held by Bombardier, Inc) Model CL-600-2B19 (Regional Jet Series 100
    & 440) airplanes, certificated in any category.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 35, Oxygen.

(e) UNSAFE CONDITION

    This AD was prompted  by a report of  an oxygen-fed ground fire  event
    potentially caused by electrical  arcing from a faulty  surround light
    wire  on  the   third  crew  memberís   (observer)  oxygen  mask.   An
    investigation determined that the oxygen supply hose connecting to the
    rear of  the observer  oxygen mask  box assembly  could be  subject to
    chafing damage. This  AD was also  prompted by the  determination that
    additional inspections and  a bracket trim  are needed to  address the
    unsafe  condition.  The  FAA  is  issuing this  AD to address possible
    damage to the observer oxygen mask supply hoses and a potential for an
    oxygen-fed fire in  the vicinity of  the observer oxygen  mask storage
    compartment.

(f) COMPLIANCE

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

(g) REQUIRED ACTIONS

    Within 4,000 flight hours  or 24 months,  whichever occurs first after
    the effective date of this AD, do the actions in paragraphs (g)(1) and
    (2) of this AD:

(1) For airplanes on which the actions  specified in MHI RJ Service Bulle-
    tin 601R-35-022, dated June 1, 2021;  or MHI RJ Service Bulletin 601R-
    35-022 Revision A, dated October 12, 2021; have not been accomplished:
    Do the actions specified in paragraphs (g)(1)(i) and (ii) of this AD.

(i) Do a general visual inspection for discrepancies of the observer's ox-
    ygen mask stowage box and stowage compartment, the observer's mask ox-
    ygen hose connections, the hose routing, and the associated electrical
    harness;  reroute the electrical harness  and apply protective sealant
    in accordance with Part A. Section 2.B. of the Accomplishment Instruc-
    tions of MHI RJ Service Bulletin 601R-35-022, Revision B,  dated April
    21, 2022.  If any discrepancies are found,  before further flight,  do
    all applicable corrective actions,  in accordance  with paragraph 2.B.
    of the Accomplishment Instructions of MHI RJ Service Bulletin 601R-35-
    022, Revision B, dated April 21, 2022.

(ii) Modify  the oxygen mask flexible lamp harness,  mounting  plate,  and
     compartment panel, including rerouting the electrical harness;  apply
     protective sealant;  inspect the  flexible lamp  assembly for correct
     installation; and trim and reidentify the bracket; in accordance with
     Part A.  Section 2.B.  of the  Accomplishment Instructions  of MHI RJ
     Service Bulletin 601R-35-022,  Revision B,  dated April 21, 2022.  Do
     all applicable flexible lamp assembly installation corrections before
     further flight in accordance  with Part A. Section 2.B. of the Accom-
     plishment Instructions  of MHI RJ Service Bulletin 601R-35-022, Revi-
     sion B, dated April 21, 2022.

(2) For airplanes on which the actions  specified in MHI RJ Service Bulle-
    tin 601R-35-022, dated June 1, 2021;  or MHI RJ Service Bulletin 601R-
    35-022,  Revision A,  dated October 12, 2021;  have been accomplished:
    Inspect the flexible lamp assembly  for correct installation;  inspect
    the wire harness assembly for damage;  and  trim  and  reidentify  the
    bracket in accordance  with Part B. Section 2.E. of the Accomplishment
    Instructions of MHI RJ Service Bulletin 601R-35-022, Revision B, dated
    April 21, 2022.  Do all applicable flexible lamp assembly installation
    corrections and damage repair before further flight in accordance with
    Part B. Section 2.E. of the Accomplishment Instructions of MHI RJ Serv
    -ice Bulletin 601R-35-022, Revision B, dated April 21, 2022.

(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 re-
    quested using the procedures found in 14 CFR 39.19. In accordance with
    14 CFR 39.19, send your request to your principal inspector or respon-
    sible 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  accom-
    plished using a method approved by the Manager,  New York  ACO Branch,
    FAA;  or Transport Canada;  or  MHI RJ Aviation ULCís Transport Canada
    Design Approval Organization (DAO).  If approved  by the DAO,  the ap-
    proval must include the DAO-authorized signature.

(i) ADDITIONAL INFORMATION

(1) Refer to Transport Canada AD CF-2021-32R1,  dated  July 25, 2022,  for
    related information.  This Transport Canada AD  may be found in the AD
    docket at regulations.gov under Docket No. FAA-2022-0141.

(2) For more information  about this AD,  contact  Gabriel Kim,  Aerospace
    Engineer, Avionics and Electrical Systems Section,  FAA,  New York ACO
    Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;  telephone
    516-228-7300; email 9-avsnyaco-cos@faa.gov.

(j) 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-35-022, Revision B, dated April 21, 2022.

(ii) [Reserved]

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

(4) You may view this service information at the FAA,  Airworthiness Prod-
    ucts Section,  Operational  Safety  Branch,  2200 South 216th 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 refer-
    ence at the National Archives and Records Administration  (NARA).  For
    information on the availability  of this material  at NARA,  email fr.
    inspection@nara.gov,  or go to: www.archives.gov/federal-register/cfr/
    ibr-locations.html.

Issued on December 15, 2022. Christina Underwood, Acting Director, Compli-
ance & Airworthiness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Gabriel Kim, Aerospace Engineer, Avionics
and Electrical Systems Section,  FAA,  New York  ACO Branch,  1600 Stewart
Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7300; email 9-avs
-nyacocos@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-0141; Project Identifier MCAI-2021-01052-T;
Amendment 39-22283; AD 2022-26-04]
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.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet Series 100 & 440)
airplanes. This AD was prompted by a report of an oxygen-fed ground
fire event potentially caused by electrical arcing from a faulty
surround light wire on the third crew member's (observer) oxygen mask.
This AD was also prompted by the determination that additional
inspections and a bracket trim are needed to address the unsafe
condition. This AD requires an inspection for discrepancies of the
observer's oxygen mask stowage box and stowage compartment, oxygen hose
connections and routing, and the associated electrical harness, and
corrective actions if necessary; and modifying the oxygen mask flexible
lamp harness, mounting plate, and compartment panel, including
rerouting the electrical harness and applying protective sealant. This
AD also requires an inspection for correct installation of the flexible
lamp assembly; trimming and reidentifying a bracket; and for certain
airplanes, an inspection for damage of the wire harness assembly; and
applicable corrective actions. The FAA is issuing this AD to address
the unsafe condition on these products.

DATES: This AD is effective February 2, 2023.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of February 2,
2023.

ADDRESSES:
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2022-0141; or in person at Docket Operations between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD
docket contains this final rule, the mandatory continuing airworthiness
information (MCAI), any comments received, and other information. The address for
Docket Operations is U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.
Material Incorporated by Reference:
For service information identified in this final rule,
contact MHI RJ Aviation Group, Customer Response Center, 3655 Ave. des
Grandes-Tourelles, Suite 110, Boisbriand, Qu[eacute]bec J7H 0E2 Canada;
North America toll-free telephone 833-990-7272 or direct-dial telephone
450-990-7272; fax 514-855-8501; email mhirj.com">thd.crj@mhirj.com; website
mhirj.com.
You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200 South
216th 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-2022-0141.

FOR FURTHER INFORMATION CONTACT: Gabriel Kim, Aerospace Engineer,
Avionics and Electrical Systems 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:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to all MHI RJ Aviation ULC
Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. The NPRM
published in the Federal Register on February 25, 2022 (87 FR 10752).
The NPRM was prompted by AD CF-2021-32, dated September 17, 2021,
issued by Transport Canada, which is the aviation authority for Canada
(Transport Canada AD CF-2021-32). Transport Canada AD CF-2021-32 states
that an oxygen-fed ground fire event was potentially caused by
electrical arcing from a faulty surround light wire on the third crew
member's (observer) oxygen mask. An investigation determined that the
oxygen supply hose connecting to the rear of the observer oxygen mask
box assembly could be subject to chafing damage.
In the NPRM, the FAA proposed to require an inspection for
discrepancies of the observer's oxygen mask stowage box and storage
compartment, oxygen hose connections and routing, and the associated
electrical harness, and corrective actions if necessary; and modifying
the oxygen mask flexible lamp harness, mounting plate, and compartment
panel, including rerouting the electrical harness and applying
protective sealant.
The FAA issued a supplemental notice of proposed rulemaking (SNPRM)
to amend 14 CFR part 39 by adding an AD that would apply to all MHI RJ
Aviation ULC Model CL-600-2B19 (Regional Jet Series 100 & 440)
airplanes. The SNPRM published in the Federal Register on October 21,
2022 (87 FR 63970). The SNPRM was prompted by Transport Canada AD CF-
2021-32R1, dated July 25, 2022 (also referred to as the MCAI). The MCAI
states that since Transport Canada AD CF-2021-32 was issued, an
operator reporting a fouling condition between the power feed wires for
the stowage box light strip and an existing aluminum bracket in the
entrance monument mask stowage compartment. The SNPRM was also prompted
by the determination that additional inspections and a bracket trim are
needed to address the unsafe condition. In the SNPRM, the FAA again
proposed to require an inspection for discrepancies of the observer's
oxygen mask stowage box and storage compartment, oxygen hose
connections and routing, and the associated electrical harness, and
corrective actions if necessary; and modifying the oxygen mask flexible
lamp harness, mounting plate, and compartment panel, including
rerouting the electrical harness and applying protective sealant. In
the SNPRM, the FAA further proposed to require an inspection for
correct installation of the flexible lamp assembly; trimming and
reidentifying a bracket; and for certain airplanes, an inspection for
damage of the wire harness assembly; and applicable corrective actions.
The FAA is issuing this AD to address possible damage to the observer
oxygen mask supply hoses and a potential for an oxygen-fed fire in the
vicinity of the observer oxygen mask storage compartment.
You may examine the MCAI in the AD docket at regulations.gov under
Docket No. FAA-2022-0141.

Discussion of Final Airworthiness Directive

Comments

The FAA received a comment from The Air Line Pilots Association,
International (ALPA), who supported the SNPRM without change.

Conclusion

This product has been approved by the aviation authority of another
country and is approved for operation in the United States. Pursuant to
the FAA's bilateral agreement with this State of Design Authority, it
has notified the FAA of the unsafe condition described in the MCAI
referenced above. The FAA reviewed the relevant data, considered the
comment received, and determined that air safety requires adopting this
AD as proposed. Accordingly, the FAA is issuing this AD to address the
unsafe condition on this product. Except for minor editorial changes,
this AD is adopted as proposed in the SNPRM. None of the changes will
increase the economic burden on any operator.

Related Service Information Under 1 CFR Part 51

The FAA reviewed MHI RJ Service Bulletin 601R-35-022, Revision B,
dated April 21, 2022. This service information specifies procedures for
doing a general visual inspection for discrepancies, including elbow
fitting clocking (rotation), sealing tape installed in a certain
location, wire damage (e.g., cuts, nicks, kinks, insulation damage) of
the observer's oxygen mask stowage box and storage compartment, the
observer's mask oxygen hose connections, the hose routing, and the
associated electrical harness, and applicable corrective actions; and
modifying the oxygen mask flexible lamp harness, mounting plate, and
compartment panel, including rerouting the electrical harness and
applying protective sealant. Corrective actions include re-positioning
the elbow fitting, removing sealing tape, and repairing wiring. This
service information also specifies procedures for an inspection for
correct installation of the flexible lamp assembly; trimming and
reidentifying a bracket; and for certain airplanes, an inspection for
damage of the wire harness assembly; and applicable corrective actions.
Corrective actions include correcting flexible lamp assembly
installations and repair.
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 407 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:


Estimated Costs for Required Actions

Labor cost
Parts cost
Cost per product
Cost on U.S. operators
Up to 9 work-hours x $85 per hour = Up to $765
Up to $115
Up to $880
Up to $358,160

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII: Aviation Programs,
describes in more detail the scope of the Agency's authority.
The FAA is issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: General requirements.
Under that section, Congress charges the FAA with promoting safe flight
of civil aircraft in air commerce by prescribing regulations for
practices, methods, and procedures the Administrator finds necessary
for safety in air commerce. This regulation is within the scope of that
authority because it addresses an unsafe condition that is likely to
exist or develop on products identified in this rulemaking action.

Regulatory Findings

This AD will not have federalism implications under Executive Order
13132. This AD will not have a substantial direct effect on the States,
on the relationship between the national government and the States, or
on the distribution of power and responsibilities among the various
levels of government.
For the reasons discussed above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

The Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec. 39.13 [Amended]

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