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2024-14-01 MHI RJ AVIATION ULC (TYPE CERTIFICATE PREVIOUSLY HELD BY BOMBARDIER, INC.): Amendment 39-22782; Docket No. FAA-2024-1009; Project Identifier MCAI-2023-01221-T.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective September 24, 2024.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This  AD  applies  to MHI RJ Aviation ULC (Type Certificate previously
    held by Bombardier, Inc.)  Model CL-600-2D15 (Regional Jet Series 705)
    and CL-600-2D24 (Regional Jet Series 900) airplanes,  certificated  in
    any category,  as identified in Transport Canada AD CF-2023-75,  dated
    November 28, 2023 (Transport Canada AD CF-2023-75).

(d) SUBJECT

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

(e) UNSAFE CONDITION

    This AD was prompted by a report that torque wrenches used during pro-
    duction installation of bulkhead fittings  on the oxygen lines of  the
    flightcrew oxygen mask stowage boxes and adapter fitting on the oxygen
    pressure gauge  were out  of calibration,  which resulted  in a higher
    torque level  setting than  required. The  FAA is  issuing this  AD to
    address this over-torque, which could cause damage to the oxygen  line
    fittings.  The unsafe  condition, if  not addressed,  could result  in
    oxygen leakage before being annunciated  and result in lack of  oxygen
    to the flightcrew when needed.

(f) COMPLIANCE

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

(g) REQUIREMENTS

    Except as specified in paragraph (h)  of this AD:  Comply with all re-
    quired actions and compliance times specified in,  and  in  accordance
    with, Transport Canada AD CF-2023-75.

(h) EXCEPTION TO TRANSPORT CANADA AD CF-2023-75

(1) Where Transport Canada AD CF-2023-75  refers  to  its  effective date,
    this AD requires using the effective date of this AD.

(2) Where Transport Canada AD CF-2023-75 refers to hours air time, this AD
    requires using flight hours.

(i) ADDITIONAL AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager, International
    Validation 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 International
    Validation Branch, mail it to the address identified in paragraph  (j)
    of this  AD. Information  may be  emailed to: 9-AVS-NYACO-COS@faa.gov.
    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,  International
    Validation Branch,  FAA; 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.

(j) ADDITIONAL INFORMATION

    For more information  about this AD,  contact  Fatin Saumik,  Aviation
    Safety Engineer,  FAA,  1600 Stewart Avenue,  Suite 410,  Westbury, NY
    11590; telephone 516-228-7300; email Fatin.R.Saumik@faa.gov.

(k) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference  (IBR)  of  the  material  listed in this paragraph  under 5
    U.S.C. 552(a) and 1 CFR part 51.

(2) You must use this material as applicable to do the actions required by
    this AD, unless this AD specifies otherwise.

(i) Transport Canada AD CF-2023-75, dated November 28, 2023.

(ii) [Reserved]

(3) For Transport Canada AD CF-2023-75 contact Transport Canada, Transport
    Canada National Aircraft Certification,  159 Cleopatra Drive,  Nepean,
    Ontario K1A 0N5,Canada; telephone 888-663-3639; email TC.Airworthiness
    Directives-Consignesdenavigabilite.TC@tc.gc.ca.   You  may  find  this
    Transport Canada AD on the Transport Canada website at tc.canada.ca/en
    /aviation.

(4) You may view this material 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 material at the National Archives and Records Admin-
    istration (NARA). For information on the availability of this material
    at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations, or
    email fr.inspection@nara.gov.

Issued on July 10, 2024. James D Foltz, Deputy Director, Compliance & Air-
worthiness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT:  Fatin Saumik,  Aviation Safety Engineer,
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228
-7300; email Fatin.R.Saumik@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39


[Docket No. FAA-2024-1009; Project Identifier MCAI-2023-01221-T;
Amendment 39-22782; AD 2024-14-01]
RIN 2120-AA64

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

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain MHI RJ Aviation ULC Model CL-600-2D15 (Regional Jet Series 705)
and CL-600-2D24 (Regional Jet Series 900) airplanes. This AD was
prompted by a report that torque wrenches used during production
installation of bulkhead fittings on the oxygen lines of the flightcrew
oxygen mask stowage boxes and adapter fitting on the oxygen pressure
gauge were out of calibration, which resulted in a higher torque level
setting than required. This AD requires replacement of the affected
oxygen line fittings, as specified in a Transport Canada AD, which is
incorporated by reference. The FAA is issuing this AD to address the
unsafe condition on these products.

DATES: This AD is effective September 25, 2024.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of September
25, 2024.

ADDRESSES:
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2024-1009; 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 Transport Canada material, contact Transport Canada,
Transport Canada National Aircraft Certification, 159 Cleopatra Drive,
Nepean, Ontario K1A 0N5, Canada; telephone 888-663-3639; email
TC.AirworthinessDirectives-Consignesdenavigabilite.TC@tc.gc.ca. You may find
this material on the Transport Canada website at tc.canada.ca/en/aviation. It is also
available at regulations.gov under Docket No. FAA-2024-1009.
You may view this material 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.

FOR FURTHER INFORMATION CONTACT: Fatin Saumik, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7300; email Fatin.R.Saumik@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 certain MHI RJ Aviation
ULC Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24
(Regional Jet Series 900) airplanes. The NPRM published in the Federal
Register on April 29, 2024 (89 FR 33297). The NPRM was prompted by AD
CF-2023-75, dated November 28, 2023, issued by Transport Canada, which
is the aviation authority for Canada (Transport Canada AD CF-2023-75)
(also referred to as the MCAI). The MCAI states MHI RJ Aviation ULC
received a quality escape notice from a supplier, reporting that torque
wrenches used during production installation of bulkhead fittings on
the oxygen lines of the flightcrew oxygen mask stowage boxes and
adapter fitting on the oxygen pressure gauge were out of calibration,
which resulted in a higher torque level setting than required by
drawing. This over-torque could cause damage to the oxygen line
fittings which, if not corrected, could cause oxygen leakage before
being annunciated and result in lack of oxygen to the flightcrew when
needed.
In the NPRM, the FAA proposed to require replacement of the
affected oxygen line fittings, as specified in Transport Canada AD CF-
2023-75. 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-2024-1009.

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.

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 NPRM. None of the changes will
increase the economic burden on any operator.

Related Material Under 1 CFR Part 51

Transport Canada AD CF-2023-75 specifies procedures for replacement
of the bulkhead fittings on the oxygen lines of the mask stowage boxes
and replacement of the fitting adapter on the oxygen pressure gauge.
This material 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 24 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
6 work-hours x $85 per hour = $510
$350
$860
$20,640

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: