Rule2025-04720
Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier Inc.) Airplanes
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
March 21, 2025
Effective
April 25, 2025
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet Series 100 and 440), CL-600-2C10 (Regional Jet Series 700, 701, and 702), CL-600- 2C11 (Regional Jet Series 550), CL-600-2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet Series 1000) airplanes. This AD was prompted by the determination that radio altimeters cannot be relied upon to perform their intended function if they experience interference from wireless broadband operations in the 3.7-3.98 GHz frequency band (5G C-Band). This AD requires installing a new radio frequency (RF) bandpass filter on the coaxial line between the radio altimeter and the receive antenna in the aft equipment compartment. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 90 Issue 54 (Friday, March 21, 2025)</title>
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[Federal Register Volume 90, Number 54 (Friday, March 21, 2025)]
[Rules and Regulations]
[Pages 13278-13284]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-04720]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-1896; Project Identifier MCAI-2023-00978-T;
Amendment 39-22966; AD 2025-04-08]
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.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain MHI RJ Aviation ULC Model CL-600-2B19 (Regional Jet Series 100
and 440), CL-600-2C10 (Regional Jet Series 700, 701, and 702), CL-600-
2C11 (Regional Jet Series 550), CL-600-2D15 (Regional Jet Series 705),
CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet
Series 1000) airplanes. This AD was prompted by the determination that
radio altimeters cannot be relied upon to perform their intended
function if they experience interference from wireless broadband
operations in the 3.7-3.98 GHz frequency band (5G C-Band). This AD
requires installing a new radio frequency (RF) bandpass filter on the
coaxial line between the radio altimeter and the receive antenna in the
aft equipment compartment. The FAA is issuing this AD to address the
unsafe condition on these products.
DATES: This AD is effective April 25, 2025.
[[Page 13279]]
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of April 25,
2025.
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2024-1896; 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:
<bullet> For MHI RJ material identified in this AD, 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 <a href="/cdn-cgi/l/email-protection#3b4f535f155849517b075a1b53495e5d06" http: mhirj.com">mhirj.com</a>">thd.crj@<a href="http://mhirj.com">mhirj.com</a></a>; website <a href="http://mhirj.com">mhirj.com</a>.
<bullet> 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 <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2024-1896.
FOR FURTHER INFORMATION CONTACT: Steven Dzierzynski, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7300; email <a href="/cdn-cgi/l/email-protection#8db4a0ecfbfea0e3f4eceee2a0eee2fecdebececa3eae2fb"><span class="__cf_email__" data-cfemail="61584c0017124c0f1800020e4c020e12210700004f060e17">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued AD 2023-10-02, Amendment 39-22438 (88 FR 34065, May
26, 2023) (AD 2023-10-02) to address the effect of interference from
wireless broadband operations in the 5G C-Band on all transport and
commuter category airplanes equipped with a radio altimeter. AD 2023-
10-02 was prompted by a determination that radio altimeters cannot be
relied upon to perform their intended function if they experience
interference from wireless broadband operations in the 5G C-Band. AD
2023-10-02 requires revising the limitations section of the existing
airplane flight manual to incorporate limitations prohibiting transport
and commuter category airplanes from performing certain low-visibility
landing operations at any airport unless they have upgraded their radio
altimeters. Transport Canada, which is the aviation authority for
Canada, issued corresponding Transport Canada AD CF-2023-46, dated June
30, 2023, to require similar limitations on flight operations requiring
radio altimeter data in U.S. airspace affected by 5G C-Band wireless
signals.
The FAA subsequently 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-600-2B19 (Regional Jet Series 100 and 440),
CL-600-2C10 (Regional Jet Series 700, 701, and 702), CL-600-2C11
(Regional Jet Series 550), CL-600-2D15 (Regional Jet Series 705), CL-
600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet
Series 1000) airplanes. The NPRM published in the Federal Register on
September 9, 2024 (89 FR 73009). The NPRM was prompted by AD CF-2023-
62R1, dated November 21, 2023, issued by Transport Canada, which is the
aviation authority for Canada (referred to after this as the MCAI). The
MCAI states that, in addition to the effects of 5G C-Band broadband
interference identified in FAA AD 2023-10-02, MHI RJ has determined
that 5G C-Band broadband interference can result in certain failure
messages and aural alerts being inhibited longer than intended.
Specifically, this can result in the inhibition of hydraulic system #3
and wing anti-ice overheat failure messages such that flightcrew are
unable to perform appropriate airplane flight manual (AFM) procedures
in the time needed to prevent loss of elevator control due to hydraulic
system overheat and wing structural damage due to wing anti-ice system
overheat. This condition, if not corrected, could result in delayed
flightcrew response leading to loss of continued safe flight and
landing.
In the NPRM, the FAA proposed to require installing a new RF
bandpass filter on the coaxial line between the radio altimeter and the
receive antenna in the aft equipment compartment. When the airplane is
modified as specified in this AD, the configuration with the RF
bandpass filter installed has been determined to be ``radio altimeter
tolerant.'' The FAA is issuing this AD because radio altimeter
anomalies can result in the inhibition of certain failure messages such
that the flightcrew are unable to perform appropriate airplane flight
manual procedures in the time needed to prevent potential ignition
hazard due to overheated hydraulic fluid circulating in the fuel tanks
area, which may lead to loss of continued safe flight and landing, and/
or structural deformation of the wing leading edge which may reduce the
safety margin (to stall).
You may examine the MCAI in the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2024-1896.
Discussion of Final Airworthiness Directive
Comments
The FAA received comments from Mesa Airlines, MHI RJ Aviation (MHI
RJ), and an individual commenter. The following presents the comments
received on the NPRM and the FAA's response to each comment.
Request To Refer To Revised Service Information
MHI RJ and an individual commenter requested that the proposed AD
be revised to refer to revised service bulletins. The individual
commenter noted that MHI RJ Service Bulletin 670BA-34-054 is currently
at Revision E. MHI RJ stated that the original issue and Revisions A,
B, C, D, and E of MHI RJ Service Bulletin 670BA-34-054; and Revisions D
and E of MHI RJ Service Bulletin 601R-34-152 should be listed as
methods of compliance for the actions required by the proposed AD. MHI
RJ also requested that all acceptable revisions of the referenced
service information be added to paragraph (n) of the proposed AD.
The FAA agrees to refer to the latest revisions of the service
information. MHI RJ Service Bulletin 601R-34-152, Revision E, dated
June 29, 2023, includes minor editorial changes (adding reference to an
FAA AD and additional reference documents; and revising recommended
compliance times, though the FAA notes that the compliance times in
this AD take precedence over those in the service information). Those
changes do not have an effect on the technical content and no
additional work is necessary for operators that incorporated MHI RJ
Service Bulletin 601R-34-152, Revision D, dated May 11, 2023. MHI RJ
Service Bulletin 670BA-34-054, dated February 20, 2023; Revision A,
dated February 28, 2023; Revision B, dated March 28, 2023; Revision C,
dated June 29, 2023; Revision D, dated August 31, 2023; and Revision E,
dated January 11, 2024; contain minor editorial revisions that do not
have an effect on the technical content or require additional work for
operators that incorporated earlier revisions. Therefore, the FAA has
revised this AD to refer to MHI RJ Service Bulletin 670BA-34-054,
Revision E, dated January 11, 2024; and MHI RJ Service Bulletin 601R-
34-152, Revision E, dated June 29, 2023.
[[Page 13280]]
Regarding the request to cite all acceptable revisions of the
service information in paragraph (n) of this AD, the FAA notes that
paragraph (n) of this AD identifies only material that is to be
incorporated by reference in the AD, and this AD requires and
incorporates by reference only Revision E of the service bulletins, as
specified in paragraphs (h), (i), and (j) of this AD.
Requests To Revise Credit for Previous Actions
An individual commenter requested that the FAA revise paragraph (k)
of the proposed AD to include credit for actions performed using the
original issue or Revisions A, B, C, or D of MHI RJ Service Bulletin
670BA-34-054. MHI RJ requested revising the conditional credit
specified in the introductory text of paragraph (k) of the proposed AD
to specify an additional document. MHI RJ noted that credit is
conditional on operators installing the electrical idents for coax
cables using Part G of MHI RJ Service Bulletin 601R-34-152, which is
included only in Revisions D and E of that service information. MHI RJ
also stated that some operators may have used, and should be granted
credit for, Service Non-Incorporated Engineering Order (SNIEO)
KCM601R53009-S01, which provides instructions for fabricating and
installing electrical idents, and which is equivalent to Part G of
Revision D and Revision E of MHI RJ Service Bulletin 601R-34-152.
The FAA agrees with the commenters' requests. The FAA has revised
paragraph (k) of this AD as follows:
<bullet> Revised paragraph (k)(1) of this AD to refer to MHI RJ
Service Bulletin 601R-34-152, Revision E, dated June 29, 2023.
<bullet> Added paragraph (k)(2) of this AD to provide credit for
actions done using certain revisions of MHI RJ Service Bulletin 601R-
34-152 provided that idents were installed using SNIEO KCM601R53009-S01
or MHI RJ Service Bulletin 601R-34-152, Revision D, dated May 11, 2023.
<bullet> Added paragraph (k)(3) of this AD to provide credit for
MHI RJ Service Bulletin 601R-34-152, Revision D, dated May 11, 2023.
<bullet> Added paragraph (k)(4) of this AD to provide credit for
the original issue and Revisions A, B, C, or D of MHI RJ Service
Bulletin 670BA-34-054.
Request To Clarify Applicability
Mesa Airlines requested clarification of the affected Model CL-600-
2D24 (Regional Jet Series 900) airplanes in paragraph (c) of the
proposed AD. The proposed AD identified manufacturer serial numbers
(MSNs) 15001 through 15990, which, according to Mesa Airlines, is all
Model CL-600-2D24 airplanes. The commenter noted, however, that the
effectivity of MHI RJ Service Bulletin 670BA-34-054, dated February 20,
2023, is limited to selected MSNs. That service bulletin was cited in
paragraph (i) of the proposed AD as the appropriate source of service
information for installing the RF bandpass filter for the specified
airplanes including Model CL-600-2D24 airplanes.
The FAA provides the following clarification. The effectivity in
MHI RJ Service Bulletin 670BA-34-054, dated February 20, 2023, is
limited to selected MSNs. According to MHI RJ, the initial issue of
this service bulletin was intended for those operators interested in
purchasing the modification, so the MSNs listed in that service
bulletin were confirmed to be committed for purchase of the
modification kits. Rather than revising the service bulletin
effectivity each time a new MSN needed to be added, MHI RJ later
decided to make the service bulletin applicable to all MSNs. Therefore,
the effectivity in subsequent service bulletin revisions includes all
MSNs. As stated previously, this AD has been changed to refer to MHI RJ
Service Bulletin 670BA-34-054, Revision E, dated January 11, 2024, for
the required actions for airplanes including Model CL-600-2D24
airplanes.
Request To Clarify Unsafe Condition
The Background section of the NPRM and paragraph (e) (``Unsafe
Condition'') of the proposed AD stated that the FAA proposed the AD
because radio altimeter anomalies can result in the inhibition of
certain failure messages such that the flightcrew are unable to perform
appropriate AFM procedures in the time needed to prevent ``loss of
elevator control due to hydraulic system overheat and wing structural
damage due to wing anti-ice system overheat,'' which could result in
``delayed flightcrew response leading to loss of continued safe flight
and landing.'' MHI RJ recommended that the FAA revise the proposed AD
to state that the intent is rather to prevent ``potential ignition
hazard due to overheated hydraulic fluid circulating in the fuel tanks
area, which may lead to loss of continued safe flight and landing, and/
or structural deformation of the wing leading edge which may reduce the
safety margin (to stall).''
The FAA agrees with MHI RJ's proposed text, which better clarifies
the radio altimeter anomalies that can result in the inhibition of
certain failure messages. The Background section and paragraph (e) of
this AD have been revised accordingly.
Request To Remove Statement Related to Unsafe Condition
The Background section of the NPRM stated that MHI RJ determined
that 5G C-Band broadband interference can result in certain failure
messages and aural alerts being inhibited longer than intended. The
Background then included the following statement:
Specifically, this can result in the inhibition of hydraulic
system #3 and wing anti-ice overheat failure messages such that
flightcrew are unable to perform appropriate airplane flight manual
(AFM) procedures in the time needed to prevent loss of elevator
control due to hydraulic system overheat and wing structural damage
due to wing anti-ice system overheat. This condition, if not
corrected, could result in delayed flightcrew response leading to
loss of continued safe flight and landing.
MHI RJ recommended removing the quoted statement because that
content is not included in Canadian AD CF-2023-46, and it is
unnecessary and misleading.
The FAA agrees to clarify. The FAA acknowledges that the specified
text is not included in Transport Canada AD CF-2023-46. However, the
FAA has determined that the added text provides additional details for
a more comprehensive background of the unsafe condition identified in
this final rule.
Request To Revise a Compliance Time
MHI RJ recommended changing paragraph (j) of the proposed AD, which
proposed to require installing an RF bandpass filter on Model CL-600-
2E25 airplanes ``before the next flight in the contiguous U.S.
airspace'' after the effective date of the AD. MJI RJ recommended
removing ``in the contiguous U.S. airspace'' because the proposed AD
would apply to U.S.-registered airplanes operating in any airspace.
The FAA disagrees with MHI RJ's request to change this compliance
time language for Model CL-600-2E25 airplanes. The language has been
retained in paragraph (j) of this AD to require compliance ``before the
next flight in the contiguous U.S. airspace'' for Model CL-600-2E25
airplanes because none of those affected airplanes are currently flying
in the U.S, but the AD requirements will apply if an affected airplane
is placed on the U.S. Registry and flown in the contiguous U.S. The FAA
has not changed paragraph (j) of this AD as a result of this comment.
[[Page 13281]]
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
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 this product. Except for minor editorial
changes, and any other changes described previously, 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 MHI RJ Service Bulletins 601R-34-152, Revision E,
dated June 29, 2023, and 670BA-34-054, Revision E, dated January 11,
2024. This material specifies procedures for installing a new RF
bandpass filter on the coaxial line between the radio altimeter and the
receive antenna in the aft equipment compartment. 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.
Costs of Compliance
The FAA estimates that this AD affects up to 873 airplanes of U.S.
registry. However, many of these airplanes may already have a bandpass
filter installed in compliance with AD 2023-10-02 and would not incur
any additional costs to comply with this AD. The FAA estimates the
following costs to comply with this AD:
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost per
Labor cost Parts cost product Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
58 work-hours x $85 per hour = $4,930... $53,647 $58,577 Up to $51,137,721.
----------------------------------------------------------------------------------------------------------------
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(f), 40113, 44701.
Sec. 39.13 [Amended]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive:
2025-04-08 MHI RJ Aviation ULC (Type Certificate Previously Held by
Bombardier Inc.): Amendment 39-22966; Docket No. FAA-2024-1896;
Project Identifier MCAI-2023-00978-T.
(a) Effective Date
This airworthiness directive (AD) is effective April 25, 2025.
(b) Affected ADs
None.
(c) Applicability
This AD applies to the MHI RJ Aviation ULC (Type Certificate
previously held by Bombardier Inc.) airplanes identified in
paragraphs (c)(1) through (6) of this AD, certificated in any
category, that are equipped with a radio altimeter and not
determined to be a radio altimeter tolerant airplane as defined in
paragraph (g) of this AD.
(1) Model CL-600-2B19 (Regional Jet Series 100 and 440)
airplanes, serial number (S/N) 7002 through 8113.
(2) Model CL-600-2C10 (Regional Jet Series 700, 701, and 702)
airplanes, S/N 10002 through 10999.
(3) Model CL-600-2C11 (Regional Jet Series 550) airplanes, S/N
10002 through 10999.
(4) Model CL-600-2D15 (Regional Jet Series 705) airplanes, S/N
15001 through 15990.
(5) Model CL-600-2D24 (Regional Jet Series 900) airplanes, S/N
15001 through 15990.
(6) Model CL-600-2E25 (Regional Jet Series 1000) airplanes, S/N
19013 through 19990.
(d) Subject
Air Transport Association (ATA) of America Code 34, Navigation.
(e) Unsafe Condition
This AD was prompted by the determination that radio altimeters
cannot be relied upon to perform their intended function if they
experience interference from wireless broadband operations in the
3.7-3.98 GHz frequency band (5G C-Band). The FAA is issuing this AD
because radio altimeter anomalies can result in the inhibition of
certain failure messages such that the flightcrew are unable to
perform appropriate airplane flight manual procedures in the time
needed to prevent potential ignition hazard due to overheated
hydraulic fluid circulating in the fuel tanks area, which may lead
to loss of continued safe flight and landing, and/or structural
deformation of the wing leading edge which may reduce the safety
margin (to stall).
[[Page 13282]]
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Definitions
For purposes of this AD, a ``radio altimeter tolerant airplane''
is one for which the radio altimeter, as installed, demonstrates the
tolerances specified in paragraphs (g)(1) and (2) of this AD, using
a method approved by the FAA. No actions are required by this AD for
radio altimeter tolerant airplanes.
(1) Tolerance to radio altimeter interference, for the
fundamental emissions (3.7-3.98 GHz), at or above the power spectral
density (PSD) curve threshold specified in figure 1 to paragraph
(g)(1) of this AD.
Figure 1 to Paragraph (g)(1)--Fundamental Effective Isotropic PSD at
Outside Interface of Airplane Antenna
BILLING CODE 4910-13-P
[GRAPHIC] [TIFF OMITTED] TR21MR25.000
(2) Tolerance to radio altimeter interference, for the spurious
emissions (4.2-4.4 GHz), at or above the PSD curve threshold
specified in figure 2 to paragraph (g)(2) of this AD.
Figure 2 to Paragraph (g)(2)--Spurious Effective Isotropic PSD at
Outside Interface of Airplane Antenna
[[Page 13283]]
[GRAPHIC] [TIFF OMITTED] TR21MR25.001
BILLING CODE 4910-13-C
(h) Filter Installation: Model CL-600-2B19
For Model CL-600-2B19 airplanes: Within 2,300 flight hours or 12
months after the effective date of this AD, whichever occurs first,
install a radio frequency (RF) bandpass filter on each radio
altimeter in accordance with the applicable parts of the
Accomplishment Instructions in MHI RJ Service Bulletin 601R-34-152,
Revision E, dated June 29, 2023. Alternatively, airplanes with a
dual radio altimeter configuration may comply with this paragraph by
installing an RF bandpass filter on one radio altimeter and
deactivating the second radio altimeter in accordance with the
applicable parts of the Accomplishment Instructions in MHI RJ
Service Bulletin 601R-34-152, Revision E, dated June 29, 2023.
(i) Filter Installation: Model CL-600-2C10, CL-600-2C11, CL-600-2D15,
and CL-600-2D24
For Model CL-600-2C10, CL-600-2C11, CL-600-2D15, and CL-600-2D24
airplanes: Within 2,100 flight hours or 12 months after the
effective date of this AD, whichever occurs first, install an RF
bandpass filter on each radio altimeter in accordance with the
applicable parts of the Accomplishment Instructions in MHI RJ
Service Bulletin 670BA-34-054, Revision E, dated January 11, 2024.
Alternatively, airplanes with a dual radio altimeter configuration
may comply with this paragraph by installing an RF bandpass filter
on one radio altimeter and deactivating the second radio altimeter
in accordance with the applicable parts of the Accomplishment
Instructions in MHI RJ Service Bulletin 670BA-34-054, Revision E,
dated January 11, 2024.
(j) Filter Installation: Model CL-600-2E25
For Model CL-600-2E25 airplanes: Before the next flight in the
contiguous U.S. airspace after the effective date of this AD,
install an RF bandpass filter on each radio altimeter in
[[Page 13284]]
accordance with the applicable parts of the Accomplishment
Instructions in MHI RJ Service Bulletin 670BA-34-054, Revision E,
dated January 11, 2024.
(k) Credit for Previous Actions
(1) For Model CL-600-2B19 airplanes: This paragraph provides
credit for the actions required by paragraph (h) of this AD, if
those actions were performed before the effective date of this AD
using the material in paragraphs (k)(1)(i) through (iv) of this AD,
provided the electrical idents for coax cables are installed using
Part G of the Accomplishment Instructions in MHI RJ Service Bulletin
601R-34-152, Revision E, dated June 29, 2023, within the compliance
time specified in paragraph (h) of this AD.
(i) MHI RJ Service Bulletin 601R-34-152, dated February 14,
2023.
(ii) MHI RJ Service Bulletin 601R-34-152, Revision A, dated
February 28, 2023.
(iii) MHI RJ Service Bulletin 601R-34-152, Revision B, dated
March 28, 2023.
(iv) MHI RJ Service Bulletin 601R-34-152, Revision C, dated
April 20, 2023.
(2) For Model CL-600-2B19 airplanes: This paragraph provides
credit for the actions required by paragraph (h) of this AD, if
those actions were performed before the effective date of this AD
using the material in paragraphs (k)(2)(i) through (iv) of this AD,
provided the electrical idents for coax cables were installed using
Part G of the Accomplishment Instructions in MHI RJ Service Bulletin
601R-34-152, Revision D, dated May 11, 2023, or MHI RJ Service Non-
Incorporated Engineering Order (SNIEO) KCM601R53009-S01, dated May
2, 2023, prior to the effective date of this AD.
(i) MHI RJ Service Bulletin 601R-34-152, dated February 14,
2023.
(ii) MHI RJ Service Bulletin 601R-34-152, Revision A, dated
February 28, 2023.
(iii) MHI RJ Service Bulletin 601R-34-152, Revision B, dated
March 28, 2023.
(iv) MHI RJ Service Bulletin 601R-34-152, Revision C, dated
April 20, 2023.
(3) For Model CL-600-2B19 airplanes: This paragraph provides
credit for the actions required by paragraph (h) of this AD, if
those actions were performed before the effective date of this AD
using MHI RJ Service Bulletin 601R-34-152, Revision D, dated May 11,
2023.
(4) For Model CL-600-2C10, CL-600-2C11, CL-600-2D15, CL-600-
2D24, and CL-600-2E25 airplanes: This paragraph provides credit for
the actions required by paragraphs (i) and (j) of this AD, as
applicable, if those actions were performed before the effective
date of this AD using the material in paragraphs (k)(4)(i) through
(v) of this AD.
(i) MHI RJ Service Bulletin 670BA-34-054, dated February 20,
2023.
(ii) MHI RJ Service Bulletin 670BA-34-054, Revision A, dated
February 28, 2023.
(iii) MHI RJ Service Bulletin 670BA-34-054, Revision B, dated
March 28, 2023.
(iv) MHI RJ Service Bulletin 670BA-34-054, Revision C, dated
June 29, 2023.
(v) MHI RJ Service Bulletin 670BA-34-054, Revision D, dated
August 31, 2023.
(l) 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 (m)(1) of this AD. Information may be emailed to
<a href="/cdn-cgi/l/email-protection#56171b19151630373778313920"><span class="__cf_email__" data-cfemail="3574787a76755354541b525a43">[email protected]</span></a>. 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 MHI RJ Aviation
ULC's Transport Canada Design Approval Organization (DAO). If
approved by the DAO, the approval must include the DAO-authorized
signature.
(m) Additional Information
(1) For more information about this AD, contact Steven
Dzierzynski, Aviation Safety Engineer, FAA, 1600 Stewart Avenue,
Suite 410, Westbury, NY 11590; telephone 516-228-7300; email <a href="/cdn-cgi/l/email-protection#754c58140306581b0c14161a58161a06351314145b121a03"><span class="__cf_email__" data-cfemail="1b22367a6d683675627a7874367874685b7d7a7a357c746d">[email protected]</span></a>.
(2) Material identified in this AD that is not incorporated by
reference is available at the address specified in paragraph (n)(3)
of this AD.
(n) 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) MHI RJ Service Bulletin 601R-34-152, Revision E, dated June
29, 2023.
(ii) MHI RJ Service Bulletin 670BA-34-054, Revision E, dated
January 11, 2024.
(3) For MHI RJ material identified in this AD, 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 <a href="/cdn-cgi/l/email-protection#d1a5b9b5ffb2a3bb91edb0f1b9a3b4b7ec" http: mhirj.com">mhirj.com</a>">thd.crj@<a href="http://mhirj.com">mhirj.com</a></a>;
website <a href="http://mhirj.com">mhirj.com</a>.
(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 <a href="http://www.archives.gov/federal-register/cfr/ibr-locations">www.archives.gov/federal-register/cfr/ibr-locations</a>, or email <a href="/cdn-cgi/l/email-protection#e28490cc8b8c91928781968b8d8ca28c839083cc858d94"><span class="__cf_email__" data-cfemail="f39581dd9a9d80839690879a9c9db39d928192dd949c85">[email protected]</span></a>.
Issued on February 18, 2025.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2025-04720 Filed 3-20-25; 8:45 am]
BILLING CODE 4910-13-P
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</html>Indexed from Federal Register on March 21, 2025.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.