[Federal Register Volume 90, Number 170 (Friday, September 5, 2025)]
[Rules and Regulations]
[Pages 42807-42812]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2025-17026]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-2009; Project Identifier AD-2023-01286-R;
Amendment 39-23121; AD 2025-17-11]
RIN 2120-AA64
Airworthiness Directives; MD Helicopters, LLC
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 MD Helicopters, LLC, Model 369 (Army YOH-6A), 369A (Army OH-
6A), 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N
helicopters. This AD was prompted by multiple reports of cracked tail
rotor (T/R) pedal support brackets. This AD requires repetitively
inspecting certain part-numbered T/R pedal support
[[Page 42808]]
brackets and depending on the results, replacing the T/R pedal support
bracket or refinishing any exposed areas. This AD also prohibits
installing certain part-numbered T/R pedal support brackets. The FAA is
issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective October 10, 2025.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of October 10,
2025.
ADDRESSES:
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2024-2009; 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, 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 MD Helicopters material identified in this AD, contact
MD Helicopters, LLC, 4555 East McDowell Road, Mesa, AZ 85215-9734;
phone: (480) 346-6300; email: [email protected]; website:
mdhelicopters.com/contact/.
You may view this material at the FAA, Office of the
Regional Counsel, Southwest Region, 10101 Hillwood Parkway, Room 6N-
321, Fort Worth, TX 76177. For information on the availability of this
material at the FAA, call (817) 222-5110. It is also available at
regulations.gov under Docket No. FAA-2024-2009.
FOR FURTHER INFORMATION CONTACT: Eduardo Orozco-Duran, Aviation Safety
Engineer, FAA, 3960 Paramount Boulevard, Lakewood, CA 90712; phone:
(562) 627-5264; 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 MD Helicopters, LLC,
Model 369 (Army YOH-6A), 369A (Army OH-6A), 369D, 369E, 369F, 369FF,
369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters with certain
part-numbered T/R pedal support brackets installed. The NPRM published
in the Federal Register on August 28, 2024 (89 FR 68837). The NPRM was
prompted by multiple reports of cracked T/R pedal support brackets,
including a report of a forced emergency landing that was caused by a
cracked magnesium cast T/R pedal support bracket. In the NPRM, the FAA
proposed to require repetitively inspecting magnesium cast T/R pedal
support brackets having P/N 369A7505-7, 369A7505-8, 369A7505-14, or
369A7505-15, and aluminum cast T/R pedal support brackets having P/N
369N2640-1 or 369N2640-2, and depending on the results, replacing the
T/R pedal support bracket or refinishing any exposed areas. The FAA
also proposed to prohibit installing magnesium cast T/R pedal support
bracket P/N 369A7505-7, 369A7505-8, 369A7505-14, or 369A7505-15 on any
helicopter. The FAA is issuing this AD to address the unsafe condition
on these products.
Discussion of Final Airworthiness Directive
Comments
The FAA received comments from five commenters. The commenters were
Bering Air Inc, MD Helicopters, an individual, and two anonymous
commenters. An anonymous commenter and the individual supported the
proposal without change, MD Helicopters and an anonymous commenter
commented on the estimated costs to comply with the AD, Bering Air Inc,
MD Helicopters, and an anonymous commenter requested different
requirements for aluminum cast T/R pedal support brackets, and MD
Helicopters requested changing the repetitive nondestructive
inspections (NDIs). The following presents the comments received on the
NPRM and the FAA's response to each comment.
Comments Regarding the Costs of Compliance
MD Helicopters and an anonymous commenter commented on the costs of
the NDIs.
MD Helicopters stated that it believes the estimated cost
information and the requirements proposed in the NPRM create an undue
burden on operators. MD Helicopters stated that the work-hours and cost
information to accomplish an NDI provided in the NPRM are very low, and
that the FAA needs to do an availability assessment of certified NDI
inspectors, as operators will likely have to remove and ship the
bracket to a facility for the NDIs. MD Helicopters further stated that
the cost information does not account for removing and reinstalling a
bracket for this alternate action or its administrative costs such as
shipping costs, nor does it account for lost revenue while the
helicopter is out of service. MD Helicopters also stated that a large
portion of operators would need to do an NDI two to three times per
year.
An anonymous commenter stated that the estimated cost information
in the NPRM to accomplish an NDI is too low. The anonymous commenter
stated that a Level II or Level III (inspector certified in the FAA-
acceptable standards for NDI personnel) for two hours of work is
between $500-$800, plus incidentals such as travel costs, which travel
costs could double or triple compliance costs particularly for those in
remote locations. The anonymous commenter further stated that the cost
of repetitive inspections for some operators needs to be properly
accounted for and the alternate option of treating the bracket as a
rotatable part could also be costly.
The FAA acknowledges the commenters' concerns regarding the NDIs
and the availability of Level II or Level III inspectors. The cost
information specified in AD rulemaking describes only the direct costs
of the specific actions required by the AD. The manufacturer specified
its best estimate of the number of work-hours necessary to accomplish
an NDI in the material incorporated by reference. This number
represents the time necessary to perform an NDI required by this AD.
The FAA recognizes that, in doing the actions required by an AD,
operators might incur incidental costs in addition to the direct costs.
The cost analysis in AD rulemaking does not include indirect or
incidental costs such as time for planning, down-time, loss of revenue,
or other administrative actions since those costs might vary
significantly among operators. In addition, the labor rate of $85 per
work-hour for the FAA to use when estimating the labor costs of
complying with AD requirements is provided by the Bureau of Labor
Statistics, found at bls.gov/oes/current/oes493011.htm. Lastly, the FAA
recognizes that this AD may require operators to accomplish multiple
instances of the repetitive NDIs each year on certain helicopters,
particularly high usage helicopters as the high usage rate increases
the likeliness of occurrence of T/R pedal support bracket cracking.
Because of these comments, the FAA completed a Final Regulatory
Flexibility Analysis (FRFA) for this AD to analyze its impact on small
businesses and updated the number of affected helicopters. Further
information regarding that analysis is provided in the Regulatory
Flexibility Determination paragraph in the preamble of this final rule.
While the costs for a Level II or Level III inspector do not impact the
cost estimate, FAA evaluation removed the proposed
[[Page 42809]]
requirement that the inspections must be performed by a Level II or
Level III inspector certified in the FAA-acceptable standards for
nondestructive inspection personnel. This may assist in each operator's
incidental costs associated with the requirements of this AD.
Comments Regarding Requirements for Aluminum Parts
Bering Air Inc, MD Helicopters, and an anonymous commenter
requested different requirements for aluminum cast T/R pedal support
brackets (P/Ns 369N2640-1 and 369N2640-2).
Bering Air Inc, asked why the same inspections for magnesium
brackets are also required for aluminum brackets, since there have been
no reports of cracks in the aluminum brackets. Bering Air Inc,
questioned how many of the cracked 17 magnesium brackets were caused by
corrosion and stated that the magnesium brackets have the issues,
possibly due to poor corrosion control. The FAA infers that Bering Air
Inc, is requesting the FAA to remove or differentiate requirements for
aluminum cast T/R pedal support brackets having P/N 369N2640-1 or
369N2640-2.
The type design holder, MD Helicopters, stated that it believes
aluminum cast T/R pedal support brackets having P/N 369N2640-1 or
369N2640-2 should not be included in the applicability of this AD
because they have not experienced a problem as existing visual
inspections specified in the maintenance manual are adequate. MD
Helicopters explained that these brackets incorporate a protective
coating and are not as susceptible to corrosion issues or fatigue
cracking compared to the magnesium brackets. Lastly, MD Helicopters
stated that installation of these brackets should be terminating action
for the requirements of the AD.
An anonymous commenter suggested the FAA consider relieving
compliance terms and times for aluminum cast T/R pedal support brackets
having P/N 369N2640-1 or 369N2640-2 or consider these parts as closing
actions. The FAA infers that ``closing actions'' means requiring
installation of aluminum cast T/R pedal support brackets as terminating
action for the requirements for magnesium cast T/R pedal support
brackets having P/N 369A7505-7, 369A7505-8, 369A7505-14, or 369A7505-
15. The anonymous commenter stated that the aluminum cast T/R pedal
support brackets have not been involved in an event and this would
provide operators with a cost-effective means of compliance.
The FAA acknowledges these comments and disagrees with different
requirements for aluminum cast T/R pedal support brackets (P/Ns
369N2640-1 and 369N2640-2). While the aluminum cast bracket material
properties can offer greater mitigation of risk of corrosion, the
aluminum cast bracket is still susceptible to deficiencies of cast
parts and therefore, should be repetitively inspected. Additionally, no
supporting data explaining or showing that aluminum cast brackets are
resistant to the unsafe condition of fatigue damage and cracking was
submitted for review with these comments. Although MD Helicopters
service material is only applicable to the magnesium brackets, the FAA
has determined that the aluminum material does not demonstrate an
acceptable level of confidence and therefore the aluminum cast T/R
pedal support brackets having P/N 369N2640-1 or 369N2640-2 are also
part of the unsafe condition. Accordingly, the FAA has included those
T/R pedal support brackets in the applicability of this final rule.
However, once this AD is published, any person may request an
alternative method of compliance (AMOC) by following the procedures
specified in paragraph (h) of this AD. The FAA has made no changes to
this AD based on those comments.
Request To Change Repetitive NDI Requirements
MD Helicopters stated that it believes the repetitive NDIs create
an undue burden on operators. MD Helicopters stated that a Level II
nondestructive technician is necessary for only the initial fluorescent
penetrant inspection (FPI), and that repetitive visual inspections
using 10X power magnifier or a borescope following the initial FPI are
sufficient. The FAA infers that MD Helicopters is requesting the FAA to
change the repetitive NDIs.
The FAA disagrees that the repetitive NDIs should be changed. The
FAA determined that repetitive FPIs, eddy current inspections, or dye
penetrant inspections, as specified in the material incorporated by
reference, which was issued by MD Helicopters, are necessary to address
the unsafe condition. Additionally, no supporting data explaining or
showing that repetitive visual inspections for the second and
subsequent instances of the NDIs substantiate an acceptable level of
safety was submitted to review. However, the FAA determined that the
proposal that the T/R pedal support bracket inspections be performed by
a Level II or Level III inspector may be burdensome and that performing
the inspections using a Level I inspector provides an adequate level of
safety, and this AD has been revised accordingly.
The FAA also determined that when refinishing any exposed areas
following the determination that there is not a crack as a result of an
NDI, it is necessary to ensure that the T/R pedal support bracket is
cleaned from any penetrant residue. The FAA has revised that
requirement accordingly.
Conclusion
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, 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 MD Helicopters Service Bulletin SB369D-231R2 for
Model 369D helicopters, SB369E-131R2 for Model 369E helicopters,
SB369F-122R2 for Model 369F and 369FF helicopters, SB369H-265R2 for
Model 369H, 369HE, 369HM, and 369HS helicopters, SB500N-068R2 for Model
500N helicopters, and SB600N-082R2 for Model 600N helicopters, each
dated November 1, 2023 (co-published as one document). For magnesium
cast T/R pedal support brackets P/N 369A7505-7, 369A7505-8, 369A7505-
14, and 369A7505-15, this material specifies procedures for visually
inspecting each T/R pedal support bracket for a crack and corrosion and
depending on the results, replacing the bracket with an aluminum cast
T/R pedal support bracket having P/N 369N2640-1 or 369N2640-2, or
refinishing any exposed areas. For magnesium cast T/R pedal support
brackets P/N 369A7505-7, 369A7505-8, 369A7505-14, and 369A7505-15, this
material also specifies procedures for fluorescent penetrant
inspecting, eddy current inspecting, or dye penetrant inspecting each
T/R pedal support bracket for a crack and depending on the results,
replacing the bracket with an aluminum cast T/R pedal support bracket
having P/N 369N2640-1 or 369N2640-2, or refinishing any exposed areas.
For the purpose of this AD, MD Helicopters, LLC, Model 369 (Army YOH-
6A) and 369A (Army OH-6A) helicopters use MD Helicopters Service
Bulletin SB369D-231R2, dated November 1, 2023, to accomplish certain
actions required by this AD.
[[Page 42810]]
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 556 helicopters of U.S.
registry. Labor rates are estimated at $85 per hour. Based on these
numbers, the FAA estimates the following costs to comply with this AD.
Visually inspecting the T/R pedal support brackets (up to two T/R
pedal support brackets per helicopter) will take approximately 0.5
work-hour for an estimated cost of up to $43 per helicopter and $23,908
for the U.S. fleet per inspection cycle. Non-destructive inspection of
the T/R pedal support brackets will take approximately 2 work-hours for
an estimated cost of up to $170 per helicopter and $94,520 for the U.S.
fleet per inspection cycle.
If required, replacing a T/R pedal support bracket will take
approximately 8 work-hours and parts will cost approximately $2,075 for
an estimated cost of $2,755 per T/R pedal support bracket. Refinishing
any exposed areas could vary significantly from helicopter to
helicopter. The FAA has no data to determine the costs to accomplish
this action or the number of helicopters that may require this action.
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 Flexibility Act Determination
The Regulatory Flexibility Act (RFA) of 1980, (5 U.S.C. 601-612),
as amended by the Small Business Regulatory Enforcement Fairness Act of
1996 (Pub. L. 104-121) and the Small Business Jobs Act of 2010 (Pub. L.
111-240), requires Federal agencies to consider the effects of the
regulatory action on small business and other small entities and to
minimize any significant economic impact. The term ``small entities''
comprises small businesses and not-for-profit organizations that are
independently owned and operated and are not dominant in their fields,
and governmental jurisdictions with populations of less than 50,000.
The FAA considered the public comments in developing this AD and
this FRFA. As of February 13, 2024, there were 369 operators of
affected helicopters in service and 556 total affected helicopters. The
operators come from a diverse group ranging from the U.S. military,
municipalities, federal government agencies, scheduled and unscheduled
aviation entities, and electricity providers, to name a few. The U.S.
Army is the most affected and operate 45 helicopters, 5 operators
operate between 10 and 12 helicopters, 36 operators operate between 3
and 9 helicopters, and the remaining 327 operators operate 2 or less
helicopters. Some operators use the affected helicopters to aid in
their primary business objective--such as power and communication line
companies that use them to install or repair their infrastructure.
Others use them as their primary business objective--such as providing
transportation to customers on a scheduled or unscheduled basis.
Given that there are many affected entities, FAA took a sample of
12 entities out of the 327 operators to determine the industries of
these entities and their size. The FAA used a subscription-based online
database of U.S. entities, D&B Hoovers Online, to determine the North
American Industry Classification System (NAICS) code, revenue, and
employee count for each entity. Based on the United States Small
Business Administration (SBA) size standards \1\ these 12 entities are
considered small and are affected by this rule. The NAICS codes
associated with these entities are and details about size standards are
listed in Table 1.
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\1\ U.S. Small Business Administration--Table of Small Business
Size Standards (2023). https://www.sba.gov/sites/default/files/2023-06/Table%20of%20Size%20Standards_Effective%20March%2017%2C%202023%20%282%29.pdf.
Table 1--NAICS Codes of Sampled Impacted Small Entities
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NAICS Small business size Number of
NAICS industry description code standard \1\ Average size of sample entities
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Water and Sewer Line and 237110 $45,000,000................ $8,520,000................. 1
Related Structures
Construction.
Power and Communication Line 237130 $45,000,000................ $1,540,000................. 1
and Related Structures
Construction.
Scheduled Passenger Air 481111 1,500 Employees............ 36 Employees............... 2
Transportation.
Nonscheduled Chartered 481211 1,500 Employees............ 15 Employees............... 1
Passenger Air Transportation.
Other Nonscheduled Air 481219 $25,000,000................ $5,661,000................. 6
Transportation.
Other Airport Operations....... 488119 $40,000,000................ $2,020,000................. 1
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\1\ The figures represent either the average annual receipts or average employment of a firm.
The lowest cost an entity can incur for inspection from this AD is
when only a visual inspection is required. This occurs when the bracket
is visually inspected by a Level I Non-destructive Testing (NDT)
Inspector and deems it does not require maintenance. FAA estimated the
cost for visual inspection at $43. The high-cost case that the FAA
estimated is $170 which requires 2 work-hours to conduct non-
destructive inspection. However, MD Helicopters commented that the
total cost for one inspection would cost $930. This estimate includes
$680 to remove the bracket, $170 for the NDT inspection to be completed
by an outside agency, and $80 for shipping charges.\2\ Due to the
issues of cost as provided by MD Helicopters, and the FAA's
determination that performing the inspections using a Level I inspector
provides an adequate level of safety, the FAA removed the proposed
requirement that inspections must be performed by a Level II or Level
III inspector certified in the FAA-acceptable standards for
[[Page 42811]]
nondestructive inspection personnel. This change broadens the personnel
that can do the inspection. Thus the change (1) reduces the likelihood
of needing to remove the bracket as it is easier to find a Level I NDT
inspector to perform an on-site inspection of the bracket while it is
being installed, (2) reduces the cost to conduct the inspection as a
more credentialed (Level II/III) inspector would cost more, and (3)
eliminates the shipping costs when NDT inspectors are able to do an on-
site inspection. An NDT inspection should be done every 300 hours
which, on average,\3\ is approximately once a year and can be conducted
in conjunction with yearly inspections. Therefore, the MD Helicopters
$930 estimated cost can be as low as $170, the same cost that the FAA
estimated for brackets to have an NDT inspection.
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\2\ The shipping charge included shipping to the inspector and
return after the inspection is completed.
\3\ FAA based this fleet usage average on information provided
by MD Helicopters.
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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:
2025-17-11 MD Helicopters, LLC: Amendment 39-23121; Docket No. FAA-
2024-2009; Project Identifier AD-2023-01286-R.
(a) Effective Date
This airworthiness directive (AD) is effective October 10, 2025.
(b) Affected ADs
None.
(c) Applicability
This AD applies to MD Helicopters, LLC, Model 369 (Army YOH-6A),
369A (Army OH-6A), 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM,
369HS, 500N, and 600N helicopters, certificated in any category,
with a tail rotor (T/R) pedal support bracket part number (P/N)
369A7505-7, 369A7505-8, 369A7505-14, 369A7505-15, 369N2640-1, or
369N2640-2, installed.
(d) Subject
Joint Aircraft System Component (JASC) Code: 6720, tail rotor
control system.
(e) Unsafe Condition
This AD was prompted by multiple reports of cracked T/R pedal
support brackets. The FAA is issuing this AD to detect a cracked T/R
pedal support bracket. The unsafe condition, if not addressed, could
result in failure of the T/R pedal support bracket, reduced
controllability of the helicopter, and consequent loss of control of
the helicopter.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
(1) Within 25 hours time-in-service (TIS) and thereafter at
intervals not to exceed 100 hours TIS, using a 10X power
magnification glass, mirror, and flashlight, visually inspect each
T/R pedal support bracket for cracks and corrosion by following the
Accomplishment Instructions, paragraph 2.A.(2)., of MD Helicopters
Service Bulletin SB369D-231R2, SB369E-131R2, SB369F-122R2, SB369H-
265R2, SB500N-068R2, or SB600N-082R2, each dated November 1, 2023
(collectively referred to as ``the service bulletins''), as
applicable to your helicopter model; you may use a borescope as
specified in the note in paragraph 2.A.(2) of the service bulletins.
For the purpose of this AD, for MD Helicopters, LLC, Model 369 (Army
YOH-6A) and 369A (Army OH-6A) helicopters, use MD Helicopters
Service Bulletin SB369D-231R2, dated November 1, 2023, to accomplish
the actions required by this AD.
(i) If there is a crack or any corrosion as a result of the
inspections required by the introductory text of paragraph (g)(1) of
this AD, before further flight, remove the T/R pedal support bracket
from service and replace it with a serviceable T/R pedal support
bracket P/N 369N2640-1 or 369N2640-2.
(ii) If there is not a crack and there is no corrosion as a
result of the inspections required by the introductory text of
paragraph (g)(1) of this AD, before further flight, refinish any
exposed areas.
(2) Within 50 hours TIS and thereafter at intervals not to
exceed 300 hours TIS, eddy current, dye penetrant, or fluorescent
penetrant inspect each T/R pedal support bracket for a crack by
following the Accomplishment Instructions, paragraph 2.B.(2)., of
the service bulletins, as applicable to your helicopter model.
(i) If there is a crack as a result of the actions required by
the introductory text of paragraph (g)(2) of this AD, before further
flight, remove the T/R pedal support bracket from service and
replace it with a serviceable T/R pedal support bracket P/N
369N2640-1 or 369N2640-2.
(ii) If there is not a crack as a result of the actions required
by the introductory text of paragraph (g)(2) of this AD, before
further flight, refinish any exposed areas and ensure the T/R pedal
support bracket is cleaned from any penetrant residue.
(3) As of the effective date of this AD, do not install
magnesium cast T/R pedal support bracket P/N 369A7505-7, 369A7505-8,
369A7505-14, or 369A7505-15 on any helicopter.
(h) Alternative Methods of Compliance (AMOCs)
(1) The Manager, West Certification 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 local Flight
Standards District Office, as appropriate. If sending information
directly to the manager of the West Certification Branch, send it to
the attention of the person identified in paragraph (i) of this AD
and email to [email protected].
(2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the local flight standards district office/certificate holding
district office.
(i) Additional Information
(1) For more information about this AD, contact Eduardo Orozco-
Duran, Aviation Safety Engineer, FAA, 3960 Paramount Boulevard,
Lakewood, CA 90712; phone: (562) 627-5264; email: [email protected].
(2) For advisory circular material identified in this AD that is
not incorporated by reference, go to faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.information/documentID/1023552.
(j) 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 the AD specifies otherwise.
(i) MD Helicopters Service Bulletin SB369D-231R2, dated November
1, 2023.
(ii) MD Helicopters Service Bulletin SB369E-131R2, dated
November 1, 2023.
(iii) MD Helicopters Service Bulletin SB369F-122R2, dated
November 1, 2023.
(iv) MD Helicopters Service Bulletin SB369H-265R2, dated
November 1, 2023.
[[Page 42812]]
(v) MD Helicopters Service Bulletin SB500N-068R2, dated November
1, 2023.
(vi) MD Helicopters Service Bulletin SB600N-082R2, dated
November 1, 2023.
Note 1 to paragraph (j)(2): The service bulletins identified in
paragraphs (j)(2)(i) through (vi) of this AD are co-published as one
document.
(3) For MD Helicopters material identified in this AD, contact
MD Helicopters, LLC, 4555 East McDowell Road, Mesa, AZ 85215-9734;
phone: (480) 346-6300; email: [email protected]; website:
mdhelicopters.com/contact/.
(4) You may view this material at the FAA, Office of the
Regional Counsel, Southwest Region, 10101 Hillwood Parkway, Room 6N-
321, Fort Worth, TX 76177. For information on the availability of
this material at the FAA, call (817) 222-5110.
(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 August 29, 2025.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2025-17026 Filed 9-4-25; 8:45 am]
BILLING CODE 4910-13-P