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[Federal Register Volume 90, Number 3 (Monday, January 6, 2025)]
[Proposed Rules]
[Pages 578-581]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-31624]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-2720; Project Identifier MCAI-2024-00129-T]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) 
for certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 
airplanes. This proposed AD was prompted by reports of engine-driven 
pump hydraulic pressure hoses for hydraulic systems number 1 and 2 
chafing against the pylon in the aft equipment bay. This proposed AD 
would require an inspection of the engine-driven pump pressure hoses 
for any damage and minimum clearance between the engine-driven pump 
hydraulic pressure hose and case drain, suction pressure hose, and 
surrounding pylon structure; and corrective actions if necessary. 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 February 
20, 2025.

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 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.
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2024-2720; 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, the mandatory continuing airworthiness 
information (MCAI), any comments received, and other information. The 
street address for Docket Operations is listed above.
    Material Incorporated by Reference:
     For Bombardier material identified in this proposed 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.
     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: Joseph Catanzaro, Aviation Safety 
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
telephone 516-228-7300; email [email protected].

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-2024-2720; 
Project Identifier MCAI-2024-00129-T'' at the

[[Page 579]]

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 
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, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, 
Suite 410, Westbury, NY 11590; telephone 516-228-7300; email [email protected]. 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, which is the aviation authority for Canada, has 
issued Transport Canada AD CF-2024-07, dated February 21, 2024 
(Transport Canada AD CF-2024-07) (also referred to as the MCAI), to 
correct an unsafe condition on certain Bombardier, Inc., Model BD-700-
1A10 and BD-700-1A11 airplanes. The MCAI states that there have been 
reports of engine-driven pump hydraulic pressure hoses for hydraulic 
systems number 1, left-hand side (LHS), and number 2, right-hand side 
(RHS), chafing against the pylon in the aft equipment bay.
    The FAA is proposing this AD to address the chafing of the 
hydraulic systems engine-driven pump hoses against the pylon, which may 
lead to hydraulic system leaks and failures and result in the loss of 
the affected hydraulic system. Loss of both hydraulic systems number 1 
and 2 would substantially reduce the airplane's functional 
capabilities. You may examine the MCAI in the AD docket at 
regulations.gov under Docket No. FAA-2024-2720.

Material Incorporated by Reference Under 1 CFR Part 51

    The FAA reviewed the following material issued by Bombardier:
     Service Bulletin 700-29-5502, dated November 29, 2023.
     Service Bulletin 700-29-6011, dated November 29, 2023.
     Service Bulletin 700-29-6502, dated November 29, 2023.
    This material describes procedures for a borescope inspection for 
routing of hydraulic systems number 1 (LHS) and number 2 (RHS) engine-
driven pump pressure hoses for any damage (including fouling or 
chafing) and for minimum clearance between the engine-driven pump 
hydraulic pressure hose and case drain, suction pressure hose, and 
surrounding pylon structure. Corrective actions include replacing and 
adjusting the pressure hoses. These documents are distinct since they 
apply to different airplane models. 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.

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 this State of Design Authority, it 
has notified the FAA of the unsafe condition described in the MCAI and 
material referenced above. The FAA is issuing this NPRM after 
determining that 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 material already described.

Clarification of Referenced Material

    Paragraph 1.A, ``Effectivity'' of Bombardier Service Bulletin 700-
29-5502, dated November 29, 2023, inadvertently identifies ``Model BD-
700-1A10 aircraft,'' instead of ``Model BD-700-1A11 aircraft.'' 
Paragraph (g)(1) of this proposed AD would require replacing the 
incorrect text with the correct text.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 36 airplanes of U.S. registry. The FAA estimates the following 
costs to comply with this proposed AD:

                                      Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
                                                                                                   Cost on U.S.
                        Labor cost                            Parts cost      Cost per product      operators
----------------------------------------------------------------------------------------------------------------
2 work-hours x $85 per hour = $170........................             $0                 $170           $6,120
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary on-
condition actions that would be required based on the results of any 
required actions. The FAA has no way of determining the number of 
aircraft that might need these on-condition actions:

                 Estimated Costs of On-Condition Actions
------------------------------------------------------------------------
             Labor cost                Parts cost      Cost per product
------------------------------------------------------------------------
2 work-hours x $85 per hour = $170.         $1,226               $1,396
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[[Page 580]]

    The FAA has included all known costs in its cost estimate. 
According to the manufacturer, however, some or all of the costs of 
this proposed 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

    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

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:

Bombardier, Inc.: Docket No. FAA-2024-2720; Project Identifier MCAI-
2024-00129-T.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by February 20, 2025.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to Bombardier, Inc., Model BD-700-1A10 and BD-
700-1A11 airplanes, certificated in any category, serial numbers (S/
Ns) 60001 through 60076 inclusive, 60083, 60087, and 60089.

(d) Subject

    Air Transport Association (ATA) of America Code 29, Hydraulic 
Power.

(e) Unsafe Condition

    This AD was prompted by reports of engine-driven pump hydraulic 
pressure hoses for hydraulic systems number 1 and 2 chafing against 
the pylon in the aft equipment bay. The FAA is issuing this AD to 
address the chafing of the hydraulic systems engine-driven pump 
hydraulic pressure hoses for the hydraulic system against the pylon, 
which may lead to hydraulic system leaks and failures and result in 
the loss of the affected hydraulic system. Loss of both hydraulic 
systems number 1 and 2 would substantially reduce the airplane's 
functional capabilities.

(f) Compliance

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

(g) Inspection of Engine-Driven Pump Hydraulic Hoses

    Within 500 flight hours or 18 months, whichever occurs first 
after the effective date of this AD, do a borescope inspection of 
the routing of hydraulic systems number 1, left-hand side (LHS), and 
number 2, right-hand side (RHS), engine-driven pump pressure hoses 
over the length of the hoses for any damage and for minimum 
clearance between the engine-driven pump hydraulic pressure hose and 
case drain, suction pressure hose, and surrounding pylon structure, 
in accordance with Section 2.B. of the Accomplishment Instructions 
of the applicable service information identified in paragraph (g)(1) 
through (3) of this AD.
    (1) For airplanes identified in Bombardier Service Bulletin 700-
29-5502, dated November 29, 2023: Bombardier Service Bulletin 700-
29-5502, dated November 29, 2023. Where paragraph 1.A. of Bombardier 
Service Bulletin 700-29-5502, dated November 29, 2023, identifies 
``Model BD-700-1A10 aircraft,'' this AD requires replacing that text 
with ``Model BD-700-1A11 aircraft.''
    (2) For airplanes identified in Bombardier Service Bulletin 700-
29-6011, dated November 29, 2023: Bombardier Service Bulletin 700-
29-6011, dated November 29, 2023.
    (3) For airplanes identified in Bombardier Service Bulletin 700-
29-6502, dated November 29, 2023: Bombardier Service Bulletin 700-
29-6502, dated November 29, 2023.

(h) Corrective Actions

    (1) If clearance is found to be less than 0.500 inch (12.70 mm) 
during the inspection required by paragraph (g) of this AD: Before 
further flight, adjust the applicable hose(s) to obtain minimum 
clearance between the engine-driven pump hydraulic pressure hose and 
case drain, suction pressure hose, and surrounding pylon structure, 
in accordance with Section 2.C. of the Accomplishment Instructions 
of the applicable service information identified in paragraphs 
(g)(1) through (3) of this AD.
    (2) If any damage (including fouling or chafing) is found during 
the inspection required by paragraph (g) of this AD: Before further 
flight, replace all damaged pressure hoses, in accordance with 
Section 2.D. of the Accomplishment Instructions of the applicable 
service information identified in paragraphs (g)(1) through (3) of 
this AD.

(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, send it to the attention of the 
person identified in paragraph (j) 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.

(j) Additional Information

    For more information about this AD, contact Joseph Catanzaro, 
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; telephone 516-228-7300; email [email protected].

[[Page 581]]

(k) 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 700-29-5502, dated November 29, 
2023.
    (ii) Bombardier Service Bulletin 700-29-6011, dated November 29, 
2023.
    (iii) Bombardier Service Bulletin 700-29-6502, dated November 
29, 2023.
    (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, visit www.archives.gov/federal-register/cfr/ibr-locations, or email [email protected].

    Issued on December 30, 2024.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2024-31624 Filed 1-3-25; 8:45 am]
BILLING CODE 4910-13-P
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