(a) COMMENTS DUE DATE
The FAA must receive comments on this airworthiness directive (AD) by
December 28, 2023.
(b) AFFECTED ADS
This AD applies to all Bombardier Inc. Model BD-100-1A10 airplanes,
certificated in any category.
Air Transport Association (ATA) of America Code 32, Landing gear.
(e) UNSAFE CONDITION
This AD was prompted by a report of a steering control unit (SCU) fil-
ter plate connector that does not meet the certification requirements
for exposure of electronic components to high intensity radiated field
environments. The FAA is issuing this AD to prevent malfunction of the
nose wheel steering (NWS) system. The unsafe condition, if not
addressed, could result in un-commanded steering or lateral runway
Comply with this AD within the compliance times specified, unless al-
(g) INSPECTION OR RECORDS REVIEW
Within 24 months after the effective date of this AD: Inspect the SCU
to determine if SCU part number (P/N) 46000-01 with a serial number
listed in Figure 1 to paragraph (g) of this AD is installed on the
airplane. A review of the airplane maintenance records is acceptable
in lieu of the inspection if the SCU P/N and serial number can be con-
clusively determined from that review. If an SCU P/N 46000-01 with a
serial number listed in Figure 1 to paragraph (g) of this AD is not
installed on the airplane, or if the SCU identification plate is
marked with SB100-32-030, then no further action is required by this
AD; however, the installation prohibition in paragraph (i) of this AD
FIGURE 1 TO PARAGRAPH (G) - AFFECTED SCU SERIAL NUMBERS
06-188, 16042190, 16047519, 16047521, 16047522, 17053050, 17053052,
17054845, 17054846, 17054847, 17055273, 17055274, 18057933, 18057934,
18058184, 18058185, 18058599, 18058600, 18058601, 18058602, 18058884,
18058885, 18058886, 18059357, 18059358, 18059359, 18059360, 18059814,
18059815, 18059816, 18059817, 18060201, 18060202, 18060582, 18060789,
18060982, 18060983, 18061292, 18061572, 18061573, 18061770, 18061771,
18061880, 18061881, 18061995, 18061996, 18062731, 18062732, 18062733,
18062734, 18063183, 18063184, 18063520, 18063521, 18064776, 18064777,
18064778, 18064779, 18065323, 18065324, 18065325, 18065326, 18065327,
18065331, 18065332, 19068045, 19068046, 19068047, 19068048, 19068049,
19068050, 19068051, 19068052, 19068053, 19068054, 19068055, 19068056,
19068057, 19068058, 19068059, 19068060, 19068061, 19068062, 19068063,
19068064, 19068065, 19068066, 19068067, 19068068, 19068069, 19068070,
19068071, 19068072, 19068073, 19068074, 19072062, 19072063, 19072067,
19072068, 19072069, 19072070, 19072071, 19072072, 19072073, 19072074,
19072075, 19072076, 19072077, 19072078, 19075712, 19075713, 19075714,
19075715, 19075716, 19075718, 19075719, 20077461, 20077462, 20077463,
20077464, 20077465, 20077466, 20077467, 20077470, 20077472, 20077473,
20077474, 20077476, 20077477, 20077478, 20077480
For airplanes with SCU P/N46000-01 with a serial number listed in
Figure 1 to paragraph (g) of this AD installed and not marked on the
SCU identification plate with SB100-32-030: Within 24 months after the
effective date of this AD, replace the SCU and rig and test the NWS
control, in accordance with the instructions in paragraph (h)(1), (2),
or (3) of this AD, as applicable.
(1) For airplane serial numbers 20001 through 20500 inclusive: Steps 2.C.
(1) and 2.C.(3) of Section 2.C., "Part B - Modification," and Section
2.D., "Testing," of the Accomplishment Instructions in Bombardier
Service Bulletin 100-32-34, dated October 18, 2021.
(2) For airplane serial numbers 20501 through 20893 inclusive: Steps 2.C.
(1) and 2.C.(3) of Section 2.C., "Part B - Modification," and Section
2.D., "Testing," of the Accomplishment Instructions in Bombardier
Service Bulletin 350-32-010, dated October 18, 2021.
(3) For airplane serial numbers 20894 and larger: 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
(i) PARTS INSTALLATION PROHIBITION
As of the effective date of this AD, do not install SCU P/N 46000-01
on any airplane if the serial number of the SCU is listed in figure 1
to paragraph (g) of this AD, unless the SCU identification plate has
been marked with SB100-32-030.
(j) 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
(k)(2) of this AD. Information may be emailed to: 9-avs-nyaco
-firstname.lastname@example.org. 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, International Valida-
tion 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.
(k) ADDITIONAL INFORMATION
(1) Refer to Transport Canada AD CF-2023-13, dated February 24, 2023, for
related information. This Transport Canada AD may be found in the AD
docket at regulations.gov under Docket No. FAA-2023-2145.
(2) For more information about this AD, contact William Reisenauer, Avia-
tion Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury,
NY 11590; telephone 516-228-7301; email email@example.com.
(l) 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) Bombardier Service Bulletin 100-32-34, dated October 18, 2021.
(ii) Bombardier Service Bulletin 350-32-010, dated October 18, 2021.
(3) For service information identified in this AD, contact Bombardier Bus-
iness Aircraft Customer Response Center, 400 Cote-Vertu Road West,
Dorval, Quebec H4S 1Y9, Canada; telephone 514-855-2999; email ac.yul@
aero.bombardier.com; website bombardier.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 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-locationsore
Issued on October 31, 2023. Victor Wicklund, Deputy Director, Compliance &
Airworthiness Division, Aircraft Certification Service.
DATES: The FAA must receive comments on this proposed AD by December 28,
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-2145; Project Identifier MCAI-2023-00358-T]
Airworthiness Directives; 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
for all Bombardier Inc. Model BD-100-1A10 airplanes. This proposed AD
was prompted by a report of a steering control unit (SCU) filter plate
connector that does not meet the certification requirements for
exposure of electronic components to high intensity radiated field
environments, which could result in malfunction of the nose wheel
steering (NWS) system. This proposed AD would require determining if
the SCU is an affected SCU, replacing all affected SCUs, and rigging
and testing the NWS control. This proposed AD would also prohibit
installing an affected SCU on any airplane. 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 December
ADDRESSES: You may send comments, using the procedures found in
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to regulations.gov. Follow
the instructions for submitting comments.
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-2023-2145; 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 service information identified in this NPRM, contact
Bombardier Business Aircraft Customer Response Center, 400 C[ocirc]te-
Vertu Road West, Dorval, Quebec H4S 1Y9, Canada; telephone 514-
855-2999; email firstname.lastname@example.org; website bombardier.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.
FOR FURTHER INFORMATION CONTACT: William Reisenauer, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7301; email email@example.com.
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-2023-2145; Project Identifier
MCAI-2023-00358-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
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
William Reisenauer, Aviation Safety Engineer, FAA, 1600 Stewart Avenue,
Suite 410, Westbury, NY 11590; telephone 516-228-7301; email
firstname.lastname@example.org. Any commentary that the FAA receives which is
specifically designated as CBI will be placed in the public docket for
Transport Canada, which is the aviation authority for Canada, has
issued Transport Canada AD CF-2023-13, dated February 24, 2023
(referred to after this as ``the MCAI''), to correct an unsafe
condition on all Bombardier Inc. Model BD-100-1A10 airplanes. The MCAI
states that the manufacturer of SCU part number (P/N) 46000-01
introduced a new filter plate connector that does not meet the
certification requirements related to the susceptibility of electronic
components to high intensity radiated field. According to the MCAI,
this non-compliant filter plate connector, if not replaced, could
result in a malfunction of the NWS system and cause un-commanded
steering or lateral excursion from the runway. The MCAI requires
removing and replacing all affected non-compliant SCUs. The FAA is
proposing 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-2023-2145.
Related Service Information Under 1 CFR Part 51
The FAA reviewed Bombardier Service Bulletin 100-32-34, dated
October 18, 2021, and Bombardier Service Bulletin 350-32-010, dated
October 18, 2021. This service information specifies procedures for
determining the serial number of SCU P/N 46000-01, replacing any
affected SCU, and rigging and testing the NWS control. These documents
are distinct since they apply to different airplane serial numbers.
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.
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
service information 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 an inspection or records review to
determine if the SCU is an affected SCU, replacement of all affected
SCUs, and rigging and testing of the NWS control. This proposed AD
would also prohibit installing an affected SCU on any airplane.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 725 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:
Estimated Costs for Required Actions
|9 work-hours x $85 per hour =
The FAA has included all known costs
in its cost estimate.
According to the manufacturer, however, some 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
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.
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
(1) Is not a ``significant regulatory action'' under Executive
(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
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