[Federal Register Volume 90, Number 155 (Thursday, August 14, 2025)]
[Rules and Regulations]
[Pages 39109-39112]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2025-15481]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2025-0908; Project Identifier MCAI-2025-00035-T;
Amendment 39-23105; AD 2025-16-07]
RIN 2120-AA64
Airworthiness Directives; Bombardier, Inc., Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain Bombardier, Inc., Model BD-700-1A10 airplanes. This AD was
prompted by a report indicating that the clearance between therapeutic
flexible oxygen hoses and electrical harnesses may be non-compliant to
design requirements, and that positive separation mechanisms and
appropriate protective barriers may not have been installed in
accordance with the applicable installation standards. This AD requires
a detailed inspection of the therapeutic flexible oxygen hose for
damage and protection, and the electrical harnesses for damage; a
detailed inspection for the clearance between the therapeutic oxygen
rigid tube to oxygen hose elbow fitting (also referred to as elbow
fitting), if applicable, and the nearest electrical harness, and
between the therapeutic flexible oxygen hose and electrical harness;
and applicable related investigative and corrective actions. The FAA is
issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective September 18, 2025.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of September 18,
2025.
ADDRESSES:
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2025-0908; 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 Bombardier material identified in this AD, contact
Bombardier Business
[[Page 39110]]
Aircraft Customer Response Center, 400 C[ocirc]te-Vertu Road West,
Dorval, Qu[eacute]bec H4S 1Y9, Canada; telephone 514-855-2999; email
bombardier.com">ac.yul@aero.bombardier.com; website bombardier.com.
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. It is also available at regulations.gov under
Docket No. FAA-2025-0908.
FOR FURTHER INFORMATION CONTACT: Brenda L. Buitrago, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
phone: 516-228-7300; email: [email protected].
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 Bombardier,
Inc., Model BD-700-1A10 airplanes. The NPRM was published in the
Federal Register on May 20, 2025 (90 FR 21437). The NPRM was prompted
by AD CF-2025-02, dated January 14, 2025, issued by Transport Canada,
which is the aviation authority for Canada (Transport Canada AD CF-
2025-02) (also referred to as the MCAI). The MCAI states that
Bombardier, Inc., has discovered the clearance between therapeutic
flexible oxygen hoses and electrical harnesses may be noncompliant to
design requirements, and that the positive separation mechanisms and
appropriate protective barriers may not have been installed in
accordance with the applicable installation standards. The MCAI also
states that instances of hard fouling have been observed on the
production line, which could lead to damage to the electrical harness
and subsequent latent failure of the firewall hydraulic shutoff valve.
This condition could result in the inability to control a powerplant
fire in the presence of a hydraulic fluid leak.
In the NPRM, the FAA proposed to require a detailed inspection of
the therapeutic flexible oxygen hose for damage and protection, and the
electrical harnesses for damage; a detailed inspection for the
clearance between the therapeutic oxygen rigid tube to oxygen hose
elbow fitting (also referred to as elbow fitting), if applicable, and
the nearest electrical harness, and between the therapeutic flexible
oxygen hose and electrical harness; and applicable related
investigative and corrective actions. 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-2025-0908.
Discussion of Final Airworthiness Directive
Comments
The FAA received no comments on the NPRM or on the determination of
the cost to the public.
Conclusion
These products have been approved by the civil aviation authority
of another country and are approved for operation in the United States.
Pursuant to the FAA's bilateral agreement with this State of Design
Authority, that authority has notified the FAA of the unsafe condition
described in the MCAI referenced above. The FAA reviewed the relevant
data, considered any comments 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 these products. 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.
Material Incorporated by Reference Under 1 CFR Part 51
The FAA reviewed Bombardier Service Bulletin 700-35-016, Bombardier
Service Bulletin 700-35-6006, and Bombardier Service Bulletin 700-35-
6503, all dated June 12, 2024. This material specifies procedures for
accomplishing the following actions near fuselage station (FS) 530
right-hand side (RHS) and FS 650.00 RHS and applicable related
investigative and corrective actions, including:
A detailed inspection to determine the gap between the
clocking angle of the therapeutic oxygen rigid tube to oxygen hose
elbow fitting, if equipped, and the nearest electrical harness.
A detailed inspection for damage (i.e., crushing, fraying,
or permanent deformation) to the therapeutic flexible oxygen hose, part
number (P/N) 38911-5-0250, and to determine if protection (i.e., split
convolex shroud, P/N HCTE0437-0-SP or similar, or spiral wrap, P/N TSW
\1/4\ or similar) is installed on the therapeutic flexible oxygen hose.
A detailed inspection of the electrical harnesses
surrounding the therapeutic flexible oxygen hose for damage (i.e.,
damaged wire sheathing or cut or nicked wires).
The applicable corrective actions include the following:
If the gap between the clocking angle of the therapeutic
oxygen rigid tube to oxygen hose elbow fitting and nearest harness is
less than 0.5 inch, adjust the elbow fitting to ensure the maximum
possible clearance between the fitting and nearest harness.
If the clearance between the wiring harness and oxygen
hose is less than 0.5 inch, install a Teflon cable wrap or Nomex
sleeving on the wiring harness.
Replacing any damaged therapeutic flexible oxygen hose
with a new hose.
Installing a split convolex shroud (P/N HCTE0437-0-SP) on
the therapeutic flexible oxygen hose, if the protection is missing.
Repairing any damaged electrical harnesses surrounding the
therapeutic flexible oxygen hose.
The related investigative actions are leak and operational tests of
the therapeutic oxygen system if any parts are repaired or replaced.
These documents are distinct since they apply to different airplane
configurations.
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 317 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
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10 work-hours x $85 per hour = $850................ $0 $850 $269,450
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The FAA has received no definitive data on which to base the cost
estimates for the on-condition actions specified in this AD.
The FAA has included all known costs in its cost estimate.
According to
[[Page 39111]]
the manufacturer, however, some or all of the costs of this AD may be
covered under warranty, thereby reducing the cost impact on affected
operators.
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
0
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]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive:
2025-16-07 Bombardier, Inc.: Amendment 39-23105; Docket No. FAA-
2025-0908; Project Identifier MCAI-2025-00035-T.
(a) Effective Date
This airworthiness directive (AD) is effective September 18,
2025.
(b) Affected ADs
None.
(c) Applicability
This AD applies to Bombardier, Inc., Model BD-700-1A10
airplanes, certificated in any category, as identified in Bombardier
Service Bulletin 700-35-016, dated June 12, 2024; Bombardier Service
Bulletin 700-35-6006, dated June 12, 2024; and Bombardier Service
Bulletin 700-35-6503, dated June 12, 2024.
(d) Subject
Air Transport Association (ATA) of America Code 35, Oxygen.
(e) Unsafe Condition
This AD was prompted by a report indicating that the clearance
between therapeutic flexible oxygen hoses and electrical harnesses
may be non-compliant to design requirements, and that positive
separation mechanisms and appropriate protective barriers may not
have been installed in accordance with the applicable installation
standards. The FAA is issuing this AD to prevent damage to the
electrical harness for the therapeutic flexible oxygen hose and
subsequent latent failure of the firewall hydraulic shutoff valve.
The unsafe condition, if not addressed, could result in the
inability to control a powerplant fire in the presence of a
hydraulic fluid leak.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Detailed Inspections and Related Investigative and Corrective
Actions
Within 10 years after the effective date of this AD, do all the
actions specified in paragraphs (g)(1) through (4) of this AD, and
do all the applicable related investigative and corrective actions
before further flight, in accordance with sections 2.B and 2.C of
the Accomplishment Instructions of Bombardier Service Bulletin 700-
35-016, Bombardier Service Bulletin 700-35-6006, and Bombardier
Service Bulletin 700-35-6503, all dated June 12, 2024, as
applicable.
(1) Do a detailed inspection to determine the gap between the
clocking angle of the therapeutic oxygen rigid tube to oxygen hose
elbow fitting, if equipped, and the nearest electrical harness.
(2) Do a detailed inspection of the therapeutic flexible oxygen
hose, part number (P/N) 38911-5-0250, for damage and to determine if
protection is installed on the hose.
(3) Do a detailed inspection of the electrical harnesses
surrounding the therapeutic flexible oxygen hose for damage.
(4) Do a detailed inspection to determine the clearance between
the electrical harnesses and therapeutic flexible oxygen hose.
(h) 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, send it to the attention of the
person identified in paragraph (i) of this AD and email to:
[email protected]. 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; or Transport Canada; or Bombardier, Inc.'s
Transport Canada Design Approval Organization (DAO). If approved by
the DAO, the approval must include the DAO-authorized signature.
(i) Additional Information
For more information about this AD, contact Brenda L. Buitrago,
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; phone: 516-228-7300; email: [email protected].
(j) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference 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) Bombardier Service Bulletin 700-35-016, dated June 12, 2024.
(ii) Bombardier Service Bulletin 700-35-6006, dated June 12,
2024.
(iii) Bombardier Service Bulletin 700-35-6503, dated June 12,
2024.
(3) For Bombardier material identified in this AD, contact
Bombardier Business Aircraft Customer Response Center, 400
C[ocirc]te-Vertu Road West, Dorval, Qu[eacute]bec H4S 1Y9, Canada;
telephone 514-855-2999; email bombardier.com">ac.yul@aero.bombardier.com; website
bombardier.com.
(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 Administration (NARA). For information on the availability
of this material at NARA,
[[Page 39112]]
visit www.archives.gov/federal-register/cfr/ibr-locations or email
[email protected].
Issued on August 1, 2025.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2025-15481 Filed 8-13-25; 8:45 am]
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