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2025-07-01 THOMMEN AIRCRAFT EQUIPMENT AG:
( c o r r e c t i o n ) Amendment 39-23002; Docket No. FAA-2024-2322; Project Identifier MCAI-2024-00065-Q. 
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective May 15, 2025.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

(1) This  AD  applies  to  Thommen Aircraft  Equipment  AG (THOMMEN)  AC32
    Digital Air Data Computers (ADCs)  having an affected part as  defined
    in paragraph (f)(1) of this AD.

(2) This  appliance is  installed on,  but not  limited to,  the following
    aircraft models specified in table  1 to paragraph (c)(2) of  this AD,
    certificated in any category.

           TABLE 1 TO PARAGRAPH (C)(2)--APPLICABLE AIRCRAFT MODELS
    ______________________________________________________________________
            TYPE CERTIFICATE HOLDER                   AIRCRAFT MODEL      
    ______________________________________________________________________
    Airbus Defense and Space S.A. (type    CN-235, CN-235-100, CN-235-200,
     certificate previously held by         and CN-235-300.
     Construcciones Aeronauticas, S.A.).
    Airbus Helicopters...................  AS332C, AS332C1, AS332L,
                                            AS332L1, AS332L2.
    Airbus Helicopters Deutschland GmbH    EC635T2+.
     (AHD).
    Bell Textron Inc.....................  212, 412, and 412EP.
    Bombardier Inc.......................  CL-600-1A11 (600).
    Columbia Helicopters Inc.............  107-II, 234.
    General Atomics Aerotek Systems GmbH   228-100, 228-101, 228-200, 228-
     (type certificate formerly held by     201, 228-202, and 228-212.
     DORNIER LUFTFAHRT Inc.).
    Gulfstream Aerospace LP..............  Westwind Astra 1124 (serial
                                            numbers 004-0410).
    International Air Response...........  C-130A.
    Kawasaki Heavy Industries, Limited...  KV107-II.
    Leonardo S.p.a.......................  A109, A109A, A109A II, A109C,
                                            A109K2, A109S, AW109SP, AW139,
                                            and AW189.
    Textron Aviation Inc.................  200, 300, 500, 501, 550, and
                                            551.
    Viking Air Limited...................  CL-215-6B11 (CL-215T Variant).
    ______________________________________________________________________

(3) This appliance is approved for installation and could be installed  on
    various aircraft modified by  Supplemental Type Certificate (STC)  No.
    SR09595RC or ST01523WI.

(d) SUBJECT

    Joint Aircraft System Component (JASC) Code 3417, Air Data Computer.

(e) UNSAFE CONDITION

    This AD was prompted by occurrences of AC32 Digital ADCs that  stopped
    functioning due to the power module failing at temperatures below  -20
    degrees Celsius. The unsafe condition, if not addressed, could  result
    in  insufficient  navigational  data  provided  to  the  flight  crew,
    resulting in reduced control of the aircraft.

(f) DEFINITIONS

    For  the  purpose of  this  AD the  definitions  in paragraphs  (f)(1)
    through (4) of this AD apply:

(1) Affected  part:  THOMMEN  AC32  Digital  ADCs,  part   numbers   (P/N)
    AC32.10.21.10.XX,     AC32.10.21.11.XX,     AC32.11.21.10.XX,      and
    AC32.11.21.11.XX (where XX  represents any alpha/numerical  sequence),
    and  having a  serial number  (S/N) listed  in Appendix  A of  THOMMEN
    AIRCRAFT EQUIPMENT  Service Bulletin  SB AC32/07,  Revision 1.0, dated
    August 31, 2023 (THOMMEN SB AC32/07 Revision 1.0).

(2) Serviceable  part: Any  AC32.(X) Digital  ADC that  is not an affected
    part; or an affected part where the power module has been replaced  by
    THOMMEN, in  accordance with  the instructions  of THOMMEN  SB AC32/07
    Revision 1.0.

(3) Group 1 aircraft: Have an affected part installed.

(4) Group  2 aircraft:  Do not  have an  affected part  installed but  are
    eligible for AC32.(X) Digital ADC installation.

(g) COMPLIANCE

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

(h) REQUIRED ACTIONS

    For Group  1 aircraft:  Within 12  months after  the effective date of
    this AD, remove each affected part from service and replace it with  a
    serviceable   part  in   accordance  with   paragraph  3.A.   of   the
    Accomplishment Instructions in THOMMEN SB AC32/07 Revision 1.0, except
    where this material specifies to send the removed affected part to the
    manufacturer, this AD does not require that action.

(i) PARTS INSTALLATION PROHIBITION

    For Group 1 and  2 aircraft: As of  the effective date of  this AD, do
    not install an affected part on any aircraft.

(j) SPECIAL FLIGHT PERMITS

    A one-time special flight permit  may be issued in accordance  with 14
    CFR 21.197 and 21.199 in order to fly to a maintenance base to perform
    the required action  in this AD,  provided a flight  profile above -15
    degrees Celsius (5 degrees Fahrenheit) is maintained.

(k) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) 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 local Flight Standards District Office, as
    appropriate.  If  sending information  directly  to the  International
    Validation Branch, send it to  the attention of the person  identified
    in paragraph (l) of this  AD and email to: AMOC@faa.gov.  Before using
    any approved  AMOC, notify  your appropriate  principal inspector,  or
    lacking a principal inspector,  the manager of the  responsible Flight
    Standards Office.

(l) ADDITIONAL INFORMATION

    For  more  information  about  this  AD,  contact  William Reisenauer,
    Aviation  Safety  Engineer,  FAA,  1600  Stewart  Avenue,  Suite  410,
    Westbury,  NY  11590;  phone:  (516)  228-7301;  email: 9-AVS-AIR-BACO
    -COS@faa.gov.

(m) 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.

(3) The following  material was approved  for IBR on  May 15, 2015  (90 FR
    15304, April 10, 2025).

(i) Thommen Aircraft Equipment Service Bulletin SB AC32/07, Revision  1.0,
    dated August 31, 2023.

(ii) [Reserved]

(4) For Thommen Aircraft Equipment  material in this AD, contact  THOMMEN,
    Hofackerstrasse 48, 4132 Muttenz,  Switzerland; phone: +41 (0)  61 965
    22 22; email: sales@thommen.aero; website: thommen.aero.

(5) 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.

(6) You may view this material at the National Archives and Records Admin-
    istration (NARA). For information on the availability of this material
    at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations  or
    email fr.inspection@nara.gov.

Issued on  April 29,  2025. Steven  W. Thompson,  Acting Deputy  Director,
Compliance & Airworthiness Division, Aircraft Certification Service.

FOR  FURTHER  INFORMATION  CONTACT:  William  Reisenauer,  Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;  phone:
(516) 228-7301; email: 9-AVS-AIR-BACO-COS@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-2322; Project Identifier MCAI-2024-00065-Q;
Amendment 39-23002; AD 2025-07-01]
RIN 2120-AA64

Airworthiness Directives; Thommen Aircraft Equipment AG Digital
Air Data Computers

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; correction.

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

SUMMARY: The FAA is correcting an airworthiness directive (AD) that
published in the Federal Register. The AD applies to certain Thommen
Aircraft Equipment AG (THOMMEN) AC32 Digital Air Data Computers (ADCs).
As published, there were typographical errors in the some of the
aircraft models in the applicability table. This document corrects
those errors. In all other respects, the original document remains the same.

DATES: This correction is effective May 15, 2025. The effective date of
AD 2025-07-01 remains May 15, 2025.

The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of May 15, 2025
(90 FR 15304, April 10, 2025).

ADDRESSES:

AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2024-2322, 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 THOMMEN AIRCRAFT EQUIPMENT material identified in this
AD, contact THOMMEN, Hofackerstrasse 48, 4132 Muttenz, Switzerland;
phone: +41 (0) 61 965 22 22; email: sales@thommen.aero; website:
thommen.aero.

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-2024-2322.

FOR FURTHER INFORMATION CONTACT: William Reisenauer, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
phone: (516) 228-7301; email: 9-AVS-AIR-BACO-COS@faa.gov.

SUPPLEMENTARY INFORMATION: AD 2025-07-01, 39-23002 (90 FR 15304, April
10, 2025) (AD 2025-07-01) applies to certain part-numbered and serial-
numbered THOMMEN AC32 ADCs and requires removing those ADCs from
service. The ADCs are installed on, but not limited to, the aircraft
models specified in table 1 to paragraph (c)(2) of the AD.

Need for the Correction

As published, three aircraft models contained typographical errors.
Table 1 to paragraph (c)(2) of the AD referred to Airbus Helicopters
Model "AS3323L2" when the correct model is "AS332L2." In addition,
Table 1 to paragraph (c)(2) of the AD referred to Leonardo S.p.a. Model
"A10A" and "1099SP" when the correct models are "A109A" and
"AW109SP." These aircraft model errors do not affect compliance with
the AD because table 1 to paragraph (c)(2) of the AD provides some, but
not all, aircraft models on which an applicable ADC may be installed.

Material Incorporated by Reference Under 1 CFR Part 51

The FAA reviewed THOMMEN AIRCRAFT EQUIPMENT Service Bulletin SB
AC32/07, Revision 1.0, dated August 31, 2023 (THOMMEN SB AC32/07,
Revision 1.0). This material specifies procedures for determining if an
aircraft is equipped with an affected AC32 Digital ADC listed in
Appendix A, determining if the actions specified in THOMMEN SB AC32/07,
Revision 1.0, were already accomplished, and replacing any affected
THOMMEN AC32 Digital ADC.

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.

Correction of Publication

This document corrects three errors 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 May 15, 2025.
Since this action only corrects three typographical errors 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 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

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]

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