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

[Federal Register Volume 91, Number 42 (Wednesday, March 4, 2026)]
[Rules and Regulations]
[Pages 10508-10510]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2026-04331]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2025-5037; Project Identifier AD-2025-00212-A; 
Amendment 39-23255; AD 2026-03-06]
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; correction.

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SUMMARY: The FAA is correcting an airworthiness directive (AD) that was 
published in the Federal Register. That AD applies to all Textron 
Aviation, Inc., Model 525B airplanes. As published, there was an error 
in Table 1 to paragraph (g) of the AD. This document corrects that 
error. In all other respects, the original document remains the same.

DATES: This correction is effective March 13, 2026. The effective date 
of AD 2026-03-06 remains March 13, 2026.

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2025-5037, 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.

[[Page 10509]]


FOR FURTHER INFORMATION CONTACT: Soban Saeed, Aviation Safety Engineer, 
FAA, 1801 South Airport Road, Wichita, KS 67209; phone: (316) 946-4123; 
email: [email protected].

SUPPLEMENTARY INFORMATION:

Background

    AD 2026-03-06, Amendment 39-23255 (91 FR 5283, February 6, 2026) 
(AD 2026-03-06), requires revising the Airworthiness Limitations 
Section (ALS) of the existing aircraft maintenance manual (AMM) or 
instructions for continued airworthiness (ICA) and the existing 
approved maintenance or inspection program, as applicable, for all 
Textron Aviation, Inc., Model 525B airplanes.

Need for Correction

    As published, there is an error in Table 1 to paragraph (g)--
Revised Model 525B Airworthiness Limitation Tasks of the AD. 
Specifically, Task Number 54-50-00-250, Inspection Document incorrectly 
references 4-12-MI. The correct reference is 4-12-NA.

Correction of Publication

    This document corrects an error and correctly adds the AD as an 
amendment to 14 CFR 39.13. Although no other part of the preamble or 
regulatory information has been corrected, the FAA is publishing the 
entire rule in the Federal Register.
    The effective date of this AD remains March 13, 2026.
    Since this action only corrects one typographical error and does 
not affect compliance with the AD, it has no adverse economic impact 
and imposes no additional burden on any person. Therefore, the FAA has 
determined that notice and public comment procedures are unnecessary.

List of Subjects in 14 CFR Part 39

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

Adoption of the Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration amends part 39 of 
the Federal Aviation Regulations (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  [Corrected]

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

2026-03-06 Textron Aviation, Inc.: Amendment 39-23255; Docket No. 
FAA-2025-5037; Project Identifier AD-2025-00212-A.

(a) Effective Date

    This airworthiness directive (AD) is effective March 13, 2026.

 (b) Affected ADs

    None.

 (c) Applicability

    This AD applies to all Textron Aviation, Inc. (Type Certificate 
previously held by Cessna Aircraft Company) Model 525B airplanes, 
certificated in any category.

 (d) Subject

    Joint Aircraft System Component (JASC) Code 5530, Vertical 
Stabilizer Structure; 5415, Nacelle/Pylon, Attach Fittings.

 (e) Unsafe Condition

    This AD was prompted by the manufacturer's revision of the 
aircraft maintenance manual (AMM) to introduce more restrictive 
inspection intervals. The FAA is issuing this AD to prevent 
undetected cracks in the engine mount and vertical stabilizer front 
and rear spar caps. The unsafe condition, if not addressed, could 
result in reduced structural integrity and consequent reduced 
controllability of the airplane.

 (f) Compliance

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

 (g) Airworthiness Limitations Section (ALS) Revision

    Within 150 hours time-in-service (TIS) or 12 months after the 
effective date of this AD, whichever occurs first: Revise the ALS of 
the existing AMM or instructions for continued airworthiness (ICA) 
and the existing approved maintenance or inspection program, as 
applicable, by incorporating the information identified in table 1 
to paragraph (g) of this AD.

                   Table 1 to Paragraph (g)--Revised Model 525B Airworthiness Limitation Tasks
----------------------------------------------------------------------------------------------------------------
                                             Existing task       Revised task       Inspection
      Task No.            Task title           interval            interval          document          Zone
----------------------------------------------------------------------------------------------------------------
54-50-00-250........  Forward Engine      6,000 hours TIS...  6,100 hours TIS,           4-12-NA        411, 412
                       Mount Channel                           then 4,100 hours
                       Flange (Eddy                            TIS thereafter.
                       Current) Special
                       Detailed
                       Inspection.
54-50-00-252........  Aft Engine Beam     11,500 hours TIS..  14,100 hours TIS,          4-12-MR        311, 312
                       Aft Upper Angle                         then every 2,700
                       Common to Aft                           hours TIS
                       Web, BL 24.50                           thereafter.
                       (Eddy Current)
                       Special Detailed
                       Inspection.
54-50-00-254........  Forward Engine      12,000 hours TIS..  16,300 hours TIS,          4-12-MS        410, 420
                       Mount Aft Channel                       then every 11,600
                       Web (Eddy                               hours TIS
                       Current) Special                        thereafter.
                       Detailed
                       Inspection.
54-50-00-255........  Forward Engine      12,000 hours TIS..  15,600 hours TIS,          4-12-NB        410, 420
                       Mount Forward                           then every 11,100
                       Channel Web (Eddy                       hours TIS
                       Current) Special                        thereafter.
                       Detailed
                       Inspection.
55-40-00-250........  Vertical Fin Left   9,000 hours TIS,    9,000 hours TIS,           4-12-ML             340
                       and Right Front     then every 7,500    then every 7,000
                       Spar Cap at         hours TIS           hours TIS
                       Attachment Hole     thereafter.         thereafter.
                       #2 (Eddy Current)
                       Special Detailed
                       Inspection.
55-40-00-251........  Vertical Fin Left   15,000 hours TIS..  17,700 hours TIS,          4-12-MO             340
                       and Right Front                         then every 14,900
                       Spar Cap at                             hours TIS
                       Attachment Hole                         thereafter.
                       #1 (Eddy Current)
                       Special Detailed
                       Inspection.

[[Page 10510]]

 
55-40-00-252........  Vertical Fin Left   15,000 hours TIS,   23,600 hours TIS,          4-12-MQ             340
                       and Right Rear      then every 14,500   then every 12,100
                       Spar Cap at         hours TIS           hours TIS
                       Attachment Hole     thereafter.         thereafter.
                       #1 (Eddy Current)
                       Special Detailed
                       Inspection.
----------------------------------------------------------------------------------------------------------------


    Note 1 to paragraph (g):  Additional guidance for accomplishing 
the actions required by this AD can be found in Textron Aviation 
Service Letter SL525B-05-04, Revision 1, dated January 7, 2025.

 (h) Provisions for Alternative Actions and Intervals

    After the action required by paragraph (g) of this AD has been 
done, no alternative actions and associated thresholds and intervals 
are allowed unless they are approved as specified in the provisions 
of paragraph (i) of this AD.

 (i) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Central 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 Central Certification Branch, send it 
to the attention of the person identified in paragraph (j)(1) 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.

 (j) Additional Information

    (1) For more information about this AD, contact Soban Saeed, 
Aviation Safety Engineer, FAA, 1801 South Airport Road, Wichita, KS 
67209; phone: (316) 946-4123; email: [email protected].
    (2) For Textron Aviation material identified in this AD that is 
not incorporated by reference, contact Textron Aviation, Inc., P.O. 
Box 7706, Wichita, KS 67277; phone: (316) 517-6215; email: 
[email protected]; website: ww2.txtav.com/technicalpublications/.

 (k) Material Incorporated by Reference

    None.

    Issued on February 27, 2026.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2026-04331 Filed 3-3-26; 8:45 am]
BILLING CODE 4910-13-P

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