Airworthiness directives › 2025-07-01
AD 2025-07-01 Airworthiness Directives; Thommen Aircraft Equipment AG Digital Air Data Computers
Applicability*9
(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 certificate previously held by Construcciones Aeronauticas, S.A.) CN-235, CN-235-100, CN-235-200, and CN-235-300. Airbus Helicopters AS332C, AS332C1, AS332L, AS332L1, AS332L2. Airbus Helicopters Deutschland GmbH (AHD) EC635T2+. Bell Textron Inc 212, 412, and 412EP. Bombardier Inc CL-600-1A11 (600). Columbia Helicopters Inc 107-II, 234. General Atomics Aerotek Systems GmbH (type certificate formerly held by DORNIER LUFTFAHRT Inc.) 228-100, 228-101, 228-200, 228-201, 228-202, and 228-212. 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.
Compliance
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Serviceable part: Any AC32.(X) Digital ADC that is not an affected part; or an affected part where the power module has been replaced by THOMMEN, in accordance with the instructions of THOMMEN SB AC32/07 Revision 1.0.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.
Required actions
Comply with this AD within the compliance times specified, unless already done.
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.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1