[Federal Register Volume 89, Number 180 (Tuesday, September 17, 2024)]
[Rules and Regulations]
[Pages 75949-75953]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-21112]



[[Page 75949]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-0470; Project Identifier AD-2023-00694-A; 
Amendment 39-22800; AD 2024-15-09]
RIN 2120-AA64


Airworthiness Directives; Textron Aviation Inc. (Type Certificate 
Previously Held by Cessna Aircraft Company) Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for 
Textron Aviation Inc. (Textron) (type certificate previously held by 
Cessna Aircraft Company) Model 525, 525A, and 525B airplanes with 
Tamarack active technology load alleviation system (ATLAS) winglets 
installed per Supplemental Type Certificate (STC) No. SA03842NY. This 
AD was prompted by a report of the potential for a failure of the ATLAS 
system in which a loss of load alleviation would be un-annunciated. 
This AD requires installing placards on the left-hand inboard edge of 
the Tamarack active camber surface (TACS) and revising the existing 
airplane flight manual (AFM) for your airplane. The FAA is issuing this 
AD to address the unsafe condition on these products.

DATES: This AD is effective October 22, 2024.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of October 22, 
2024.

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2024-0470; 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:
    <bullet> For Tamarack material identified in this AD, contact 
Tamarack Aerospace Group, Inc., 2021 Industrial Drive, Sandpoint, ID 
83864; phone: (208) 597-4568; website: tamarackaero.com/customer-support.
    <bullet> You may view this material at the FAA, Airworthiness 
Products Section, Operational Safety Branch, 901 Locust, Kansas City, 
MO 64106. 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-2024-0470.

FOR FURTHER INFORMATION CONTACT: Anthony Caldejon, Aviation Safety 
Engineer, FAA, 3960 Paramount Boulevard, Lakewood, CA 90712; phone: 
(206) 231-3534; email: <a href="/cdn-cgi/l/email-protection#f899968c90979681d68ed69b99949c9d929796b89e9999d69f978e"><span class="__cf_email__" data-cfemail="90f1fee4f8fffee9bee6bef3f1fcf4f5fafffed0f6f1f1bef7ffe6">[email protected]</span></a>.

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 Textron (type 
certificate previously held by Cessna Aircraft Company) Model 525, 
525A, and 525B airplanes with Tamarack ATLAS winglets installed per STC 
No. SA03842NY. The NPRM published in the Federal Register on March 22, 
2024 (89 FR 20354). The NPRM was prompted by a report that while 
accomplishing a reliability improvement program, Tamarack discovered 
the potential for a failure of the ATLAS system in which a loss of load 
alleviation would be un-annunciated. The manufacturer's investigation 
revealed that failure of either of one of a pair of opto-isolators 
within the ATLAS Control Unit (ACU) can prevent an enable signal from 
being sent to the TACS Control Units (TCUs).
    The ATLAS system is installed on Textron Model 525, 525A, and 525B 
airplanes under STC No. SA03842NY and lessens the increased wing loads 
associated with the installation of winglets. The ATLAS is designed to 
detect flight conditions and modify airflow at the wing tip 
accordingly. The ATLAS will draw power constantly to operate the logic 
circuit and provide power to the actuators to maintain TACS position.
    The TCUs include the linear electric actuators and motor 
controllers that move the TACS. Since the enable signals are not 
monitored after the opto-isolators, the ACU cannot detect whether the 
generated signal is reaching the TCUs. The TCUs rely on the enable 
signal to determine whether to respond to commands from the ACU. If one 
of the opto-isolators fails, the ACU would not be able to detect that 
the TCUs were not enabled and the TCUs would not respond to commands 
from the ACU. Thus, the system would be operating in a mode of un-
annunciated loss of load alleviation. The flight crew would be unaware 
of a malfunction of the load alleviation function of ATLAS and could 
fly the airplane into conditions that exceed the limit load. In 
addition, fatigue concerns could result in cracking of the airplane's 
primary structure. If not addressed, this condition could result in 
loss of continued safe flight and landing of the airplane.
    In the NPRM, the FAA proposed to require installing placards on the 
left-hand inboard edge of the TACS to enhance visibility of TACS 
movement during night operations and revising the existing AFM for your 
airplane to include instructions for pre-flight checks of the ATLAS 
system before taxi. 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 three commenters. Two of the 
commenters were individuals who supported the NPRM. The third commenter 
was Tamarack. The following presents the comments received on the NPRM 
from Tamarack and the FAA's response to each comment.

Request To Clarify What Prompted the NPRM

    Tamarack requested that the FAA correct the SUMMARY and paragraph 
(e), ``Unsafe Condition,'' which state that the NPRM was prompted by a 
report of an un-annunciated failure of the ATLAS system. Tamarack 
commented that this statement is not accurate because even though 
Tamarack reported the design deficiency to the FAA under 14 CFR 21.3, 
``Reporting of failures, malfunctions, and defects,'' there had not 
been any actual failures of the ATLAS system in the fleet. Tamarack 
stated that the ``Background'' section of the NPRM more accurately 
explains that, while accomplishing a reliability improvement program, 
Tamarack discovered the potential for a failure of the ATLAS system in 
which a loss of load alleviation would be un-annunciated.
    The FAA agrees to correct the language identified by the commenter 
and has revised the SUMMARY and paragraph (e) of this AD accordingly.

Request To Revise ``Proposed AD Requirements in This NPRM'' Section

    Tamarack requested that the FAA revise the ``Proposed AD 
Requirements in This NPRM'' section of the NPRM to specify who can 
accomplish the required actions. Tamarack stated that it is unclear 
whether a pilot can install the

[[Page 75950]]

placards on the left-hand inboard edge of the TACS or whether the 
placards must be installed by a certificated airframe and powerplant 
(A&P) mechanic.
    Paragraph (g) of this AD only allows a pilot to do the revision to 
the AFM required by paragraph (g)(2) of this AD and does not allow a 
pilot to do the installation of placards required by paragraph (g)(1) 
of this AD. An FAA-certificated A&P mechanic or repair station must 
install the placards on the left-hand inboard edge of the TACS. The FAA 
has not revised the ``Proposed AD Requirements in This NPRM'' section 
as requested by the commenter because that section of the NPRM is not 
carried over into this final rule.

Request To Revise ``FAA's Determination'' Section of the NPRM

    Tamarack requested that the FAA revise the ``FAA's Determination'' 
section of the NPRM, which states that the FAA has determined that the 
unsafe condition is likely to exist or develop on other products of the 
same type design. Tamarack stated that the probability of the unsafe 
condition is ``remote'' and not ``likely'' and therefore using 
``likely'' misrepresents the probability of the identified unsafe 
condition occurring in the fleet.
    The FAA disagrees. The ``FAA's Determination'' section of the NPRM 
correlates to the FAA's finding under 14 CFR 39.5, which states the 
conditions that must be present when the FAA issues an AD. If an unsafe 
condition only exists on one product and is not likely to exist or 
develop on other products of the same type design, or if there are no 
other existing products of the same type design, the FAA will 
accomplish corrective action through means other than an AD. The FAA's 
finding under 14 CFR 39.5 is unrelated to the probability of the 
failure condition described by the commenter. The FAA did not revise 
this final rule regarding this issue.

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 the change described 
previously, this AD is adopted as proposed in the NPRM.

Material Incorporated by Reference Under 1 CFR Part 51

    The FAA reviewed Tamarack Aerospace Atlas Service Bulletin SBATLAS-
57-06, Issue A, dated April 19, 2023. This material specifies 
procedures for installing placards on the left-hand inboard edge of the 
TACS to enhance visibility of TACS movement during night operations.
    The FAA also reviewed the following AFM supplements, which contain, 
among other items, instructions for pre-flight checks of the ATLAS 
system before taxi. These documents are distinct because they apply to 
different airplane models.
    <bullet> Tamarack Aerospace Cessna Citation Model 525, 525-0001 
thru -0359, AFM Supplement TAG-1101-0099 CA/DD/M023, Tamarack Active 
Technology Load Alleviation System (Atlas) Winglets, Issue D, dated 
September 20, 2023.
    <bullet> Tamarack Aerospace Cessna Citation Model 525, 525-0360 
through -0599, AFM Supplement TAG-1101-1099 CA/DD/M037, Tamarack Active 
Technology Load Alleviation System (Atlas) Winglets, Issue D, dated 
September 20, 2023.
    <bullet> Tamarack Aerospace Cessna Citation Model 525, 525-0600 
through -0684 and -0686 through -0701, AFM Supplement TAG-1101-P099 CA/
DD/M038, Tamarack Active Technology Load Alleviation System (Atlas) 
Winglets, Issue D, dated September 20, 2023.
    <bullet> Tamarack Aerospace Cessna Citation Model 525, 525-0685 and 
-0800 and on, AFM Supplement TAG-1101-M099 CA/DD/M088, Tamarack Active 
Technology Load Alleviation System (Atlas) Winglets, Issue D, September 
20, 2023.
    <bullet> Tamarack Aerospace Cessna Citation Model 525A, 525A-0001 
thru -0299, AFM Supplement TAG-1102-0099 CAS/AFM0003, Tamarack Active 
Technology Load Alleviation System (Atlas) Winglets, Issue C, September 
20, 2023.
    <bullet> Tamarack Aerospace Cessna Citation Model 525A, 525A-0300 
and on, AFM Supplement TAG-1102-P099 CAS/AFM0004, Tamarack Active 
Technology Load Alleviation System (Atlas) Winglets, Issue C, September 
20, 2023.
    <bullet> Tamarack Aerospace Cessna Citation Jet Model 525B, 525B-
0001 thru 525B-0056 and 525B-0058 thru 525B-0450, AFM Supplement TAG-
1103-0099 CAS/AFM0001, Tamarack Active Technology Load Alleviation 
System (Atlas) Winglets, Issue C, September 20, 2023.
    <bullet> Tamarack Aerospace Cessna Citation Jet Model 525B, 525B-
0057 and 525B-0451 and ON, AFM Supplement TAG-1103-P099 CAS/AFM0002, 
Tamarack Active Technology Load Alleviation System (Atlas) Winglets, 
Issue D, September 20, 2023.
    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 148 airplanes of U.S. 
registry.
    The FAA estimates the following costs to comply with this AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
                Action                         Labor cost           Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Install placards......................  0.5 work-hour x $85 per              $20          $62.50          $9,250
                                         hour = $42.50.
Revise AFM............................  1 work-hour x $85 per                  0              85          12,580
                                         hour = $85.
----------------------------------------------------------------------------------------------------------------

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

[[Page 75951]]

develop on products identified in this rulemaking action.

Regulatory Findings

    This AD will not have federalism implications under Executive Order 
13132. This AD will not have a substantial direct effect on the States, 
on the relationship between the national government and the States, or 
on the distribution of power and responsibilities among the various 
levels of government.
    For the reasons discussed above, I certify that this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Will not affect intrastate aviation in Alaska, and
    (3) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive:

2024-15-09 Textron Aviation Inc. (Type Certificate Previously Held 
by Cessna Aircraft Company): Amendment 39-22800; Docket No. FAA-
2024-0470; Project Identifier AD-2023-00694-A.

(a) Effective Date

    This airworthiness directive (AD) is effective October 22, 2024.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to Textron Aviation Inc. (type certificate 
previously held by Cessna Aircraft Company) Model 525, 525A, and 
525B airplanes, all serial numbers (S/Ns), certificated in any 
category, with Tamarack active technology load alleviation system 
(ATLAS) winglets installed in accordance with Supplemental Type 
Certificate No. SA03842NY.

(d) Subject

    Joint Aircraft System Component (JASC) Code 2770, Gust Lock/
Damper System

(e) Unsafe Condition

    This AD was prompted by a report of the potential for a failure 
of the ATLAS system in which a loss of load alleviation would be un-
annunciated. The FAA is issuing this AD to address un-annunciated 
loss of load alleviation which, if not addressed, could lead to the 
flight crew flying the airplane into conditions that exceed the 
limit load, as well as fatigue cracking in the airplane's primary 
structure. This could result in loss of continued safe flight and 
landing of the airplane.

(f) Compliance

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

(g) Required Actions

    Within 60 hours time-in-service or 6 months after the effective 
date of this AD, whichever occurs first, do the actions required by 
paragraphs (g)(1) and (2) of this AD.
    (1) Install placards on the left-hand Tamarack active camber 
surface (TACS) in accordance with steps 1 through 3 of the 
Accomplishment Instructions in Tamarack Aerospace Atlas Service 
Bulletin SBATLAS-57-06, Issue A, dated April 19, 2023.
    (2) Revise the Normal Procedures section of the existing 
airplane flight manual (AFM) for your airplane by adding the 
information in Figure 1 to paragraph (g)(2) of this AD under 
``Before Taxi'' or by incorporating the AFM supplement applicable to 
your airplane identified in Figure 2 to paragraph (g)(2) of this AD. 
Using a different document with information identical to this 
information under ``Before Taxi'' in the AFM for your airplane is 
acceptable for compliance with the requirements of this paragraph. 
The owner/operator (pilot) holding at least a private pilot 
certificate may revise the existing AFM for your airplane and must 
enter compliance with the applicable paragraph of this AD into the 
airplane maintenance records in accordance with 14 CFR 43.9(a) and 
91.417(a)(2)(v). The record must be maintained as required by 14 CFR 
91.417, 121.380, or 135.439.

           Figure 1 to Paragraph (g)(2)--ATLAS Check Procedure
------------------------------------------------------------------------
 
------------------------------------------------------------------------
Before Taxi
 
                                 WARNING
The TACS should move rapidly and forcefully trailing edge up and return
 to the neutral position when the ATLAS first receives power. Be sure
 that all personnel and equipment are clear before moving switch to the
 ON position.
 
ATLAS System............................  CHECK
(Test that the ATLAS is working properly.)
 
a. In poor light or dark conditions, turn on left side reading light.
b. In poor light or dark conditions, turn on Wing Inspection Light.
c. ATLAS INOP Button--Press 3 times within 3 seconds. ATLAS INOP Button
 light will flash 3 times when system goes through BIT
 (Built In Test).
 
                                 WARNING
The TACS should move rapidly and
 forcefully trailing edge up and return
 to the neutral position when running
 the BIT function. Be sure that all
 personnel and equipment are clear
 before pressing.
 
d. TACS.................................  CHECK MOVEMENT
 Both TACS should rapidly move up and return to the neutral position....
 i. If the TACS do not move after completing step c., this may indicate
 that ATLAS is not functioning normally..
 ii. Refer to Abnormal Procedure ATLAS INOPERATIVE ON THE GROUND (TACS
 DO NOT MOVE IN BIT)..
e. Wait approximately 10 seconds.
f. ATLAS INOP Button light..............  CHECK OFF
g. If left side reading light is illuminated, turn off at pilot's
 discretion.
h. If Wing Inspection Light is illuminated, turn off at pilot's
 discretion.
 
                                  NOTE
If annunciator remains illuminated, or if the TACS do not move, a fault
 has been identified in the system. In either case refer to Abnormal
 Procedures ATLAS INOPERATIVE ON THE GROUND.
------------------------------------------------------------------------


[[Page 75952]]


      Figure 2 to Paragraph (g)(2)--Tamarack ATLAS AFM Supplements
------------------------------------------------------------------------
             Model and S/N                Tamarack ATLAS AFM supplement
------------------------------------------------------------------------
Model 525, S/Ns 525-0001 through 525-    Paragraph 3A, ATLAS System,
 0359 inclusive.                          under ``Before Taxiing'' in
                                          the Normal Procedures section
                                          of Cessna Citation Model 525,
                                          525-0001 thru -0359, AFM
                                          Supplement TAG-1101-0099 CA/DD/
                                          M023, Tamarack Active
                                          Technology Load Alleviation
                                          System (Atlas) Winglets, Issue
                                          D, dated September 20, 2023.
Model 525, S/Ns 525-0360 through 525-    Paragraph 3A, ATLAS System,
 0599 inclusive.                          under ``Before Taxi'' in the
                                          Normal Procedures section of
                                          Cessna Citation Model 525, 525-
                                          0360 thru -0599, AFM
                                          Supplement TAG-1101-1099 CA/DD/
                                          M037, Tamarack Active
                                          Technology Load Alleviation
                                          System (Atlas) Winglets, Issue
                                          D, dated September 20, 2023.
Model 525, S/Ns 525-0600 through 525-    Paragraph 1A, ATLAS System,
 0684 inclusive and S/Ns 525-0686         under ``Before Taxi'' in the
 through 525-0701 inclusive.              Normal Procedures section of
                                          Cessna Citation Model 525, 525-
                                          0600 through -0684 and -0686
                                          through -0701, AFM Supplement
                                          TAG-1101-P099 CA/DD/M038,
                                          Tamarack Active Technology
                                          Load Alleviation System
                                          (Atlas) Winglets, Issue D,
                                          dated September 20, 2023.
Model 525, S/N 525-0685 and S/Ns 525-    Paragraph 9A, ATLAS System,
 0800 and larger.                         under ``Before Taxi'' in the
                                          Normal Procedures section of
                                          Cessna Citation Model 525, 525-
                                          0685 and -0800 and on, AFM
                                          Supplement TAG-1101-M099 CA/DD/
                                          M088, Tamarack Active
                                          Technology Load Alleviation
                                          System (Atlas) Winglets, Issue
                                          D, dated September 20, 2023.
Model 525A, S/Ns 525A-0001 through 525-  Paragraph 3A, ATLAS System,
 0299 inclusive.                          under ``Before Taxi'' in the
                                          Normal Procedures section of
                                          Cessna Citation Model 525A,
                                          525A-0001 thru -0299, AFM
                                          Supplement TAG-1102-0099 CAS/
                                          AFM0003, Tamarack Active
                                          Technology Load Alleviation
                                          System (Atlas) Winglets, Issue
                                          C, dated September 20, 2023.
Model 525A, S/Ns 525A-0300 and larger..  Paragraph 1A, ATLAS System,
                                          under ``Before Taxi'' in the
                                          Normal Procedures section of
                                          Cessna Citation Model 525A,
                                          525A-0300 and on, AFM
                                          Supplement TAG-1102-P099 CAS/
                                          AFM0004, Tamarack Active
                                          Technology Load Alleviation
                                          System (Atlas) Winglets, Issue
                                          C, dated September 20, 2023.
Model 525B, S/Ns 525B-0001 through 525B- Paragraph 1A, ATLAS System,
 0056 inclusive and S/Ns 525B-0058        under ``Before Taxi'' in the
 through 525B-0450 inclusive.             Normal Procedures section of
                                          Cessna CitationJet Model 525B,
                                          525B-0001 thru 525B-0056 and
                                          525B-0058 thru 525B-0450, AFM
                                          Supplement TAG-1103-0099 CAS/
                                          AFM0001, Tamarack Active
                                          Technology Load Alleviation
                                          System (Atlas) Winglets, Issue
                                          C, dated September 20, 2023.
Model 525B, S/N 525B-0057 and S/Ns 525B- Paragraph 9A, ATLAS System,
 0451 and larger.                         under ``Before Taxi'' in the
                                          Normal Procedures section of
                                          Cessna CitationJet Model 525B,
                                          525B-0057 and 525B-0451 and
                                          ON, AFM Supplement TAG-1103-
                                          P099 CAS/AFM0002, Tamarack
                                          Active Technology Load
                                          Alleviation System (Atlas)
                                          Winglets, Issue D, dated
                                          September 20, 2023.
------------------------------------------------------------------------

(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 it to <a href="/cdn-cgi/l/email-protection#94adb9d5dad9b9c7f1f5e0e0f8f1b9d5d7dbb9d5d9dbd7b9c6f1e5e1f1e7e0e7d4f2f5f5baf3fbe2"><span class="__cf_email__" data-cfemail="e0d9cda1aeadcdb3858194948c85cda1a3afcda1adafa3cdb285919585939493a0868181ce878f96">[email protected]</span></a>.
    (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) Related Information

    For more information about this AD, contact Anthony Caldejon, 
Aviation Safety Engineer, FAA, 3960 Paramount Boulevard, Lakewood, 
CA 90712; phone: (206) 231-3534; email: <a href="/cdn-cgi/l/email-protection#cdaca3b9a5a2a3b4e3bbe3aeaca1a9a8a7a2a38dabacace3aaa2bb"><span class="__cf_email__" data-cfemail="8feee1fbe7e0e1f6a1f9a1eceee3ebeae5e0e1cfe9eeeea1e8e0f9">[email protected]</span></a>.

(j) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference of the material listed in this paragraph 
under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this material as applicable to do the actions 
required by this AD, unless the AD specifies otherwise.
    (i) Tamarack Aerospace Atlas Service Bulletin SBATLAS-57-06, 
Issue A, dated April 19, 2023.
    (ii) Tamarack Aerospace Cessna Citation Model 525, 525-0001 thru 
-0359, Airplane Flight Manual (AFM) Supplement TAG-1101-0099 CA/DD/
M023, Tamarack Active Technology Load Alleviation System (Atlas) 
Winglets, Issue D, dated September 20, 2023.
    (iii) Tamarack Aerospace Cessna Citation Model 525, 525-0360 
thru -0599, AFM Supplement TAG-1101-1099 CA/DD/M037, Tamarack Active 
Technology Load Alleviation System (Atlas) Winglets, Issue D, dated 
September 20, 2023.
    (iv) Tamarack Aerospace Cessna Citation Model 525, 525-0600 
through -0684 and -0686 through -0701, AFM Supplement TAG-1101-P099 
CA/DD/M038, Tamarack Active Technology Load Alleviation System 
(Atlas) Winglets, Issue D, dated September 20, 2023.
    (v) Tamarack Aerospace Cessna Citation Model 525, 525-0685 and -
0800 and on, AFM Supplement TAG-1101-M099 CA/DD/M088, Tamarack 
Active Technology Load Alleviation System (Atlas) Winglets, Issue D, 
September 20, 2023.
    (vi) Tamarack Aerospace Cessna Citation Model 525A, 525A-0001 
thru -0299, AFM Supplement TAG-1102-0099 CAS/AFM0003, Tamarack 
Active Technology Load Alleviation System (Atlas) Winglets, Issue C, 
September 20, 2023.
    (vii) Tamarack Aerospace Cessna Citation Model 525A, 525A-0300 
and on, AFM Supplement TAG-1102-P099 CAS/AFM0004, Tamarack Active 
Technology Load Alleviation System (Atlas) Winglets, Issue C, 
September 20, 2023.
    (viii) Tamarack Aerospace Cessna CitationJet Model 525B, 525B-
0001 thru 525B-0056 and 525B-0058 thru 525B-0450, AFM Supplement 
TAG-1103-0099 CAS/AFM0001, Tamarack Active Technology Load 
Alleviation System (Atlas) Winglets, Issue C, September 20, 2023.

[[Page 75953]]

    (ix) Tamarack Aerospace Cessna CitationJet Model 525B, 525B-0057 
and 525B-0451 and ON, AFM Supplement TAG-1103-P099 CAS/AFM0002, 
Tamarack Active Technology Load Alleviation System (Atlas) Winglets, 
Issue D, September 20, 2023.
    (3) For Tamarack material identified in this AD, contact 
Tamarack Aerospace Group, Inc., 2021 Industrial Drive, Sandpoint, ID 
83864; phone: (208) 597-4568; website: tamarackaero.com/customer-support.
    (4) You may view this material at FAA, Airworthiness Products 
Section, Operational Safety Branch, 901 Locust, Kansas City, MO 
64106. 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 <a href="/cdn-cgi/l/email-protection#1a267b3a72687f7c27" http: www.archives.gov federal-register cfr ibr-locationsoremailfr.inspection@nara.gov">www.archives.gov/federal-register/cfr/<span class="__cf_email__" data-cfemail="8de4efffa0e1e2eeecf9e4e2e3fee2ffe8e0ece4e1ebffa3e4e3fefde8eef9e4e2e3cde3ecffeca3eae2fb">[email protected]</span></a>"><a href="http://www.archives.gov/federal-register/cfr/ibr-locationsoremailfr.inspection@nara.gov">www.archives.gov/federal-register/cfr/<span class="__cf_email__" data-cfemail="88e1eafaa5e4e7ebe9fce1e7e6fbe7faede5e9e1e4eefaa6e1e6fbf8edebfce1e7e6c8e6e9fae9a6efe7fe">[email protected]</span></a></a>.

    Issued on September 10, 2024.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2024-21112 Filed 9-16-24; 8:45 am]
BILLING CODE 4910-13-P


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