AD 2025-06066
Published 2025-04-10 · 11 models · 123 US-registered tails affected · Federal Register
Airworthiness Directives; Thommen Aircraft Equipment AG Digital Air Data Computers Federal Register ↗
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain THOMMEN AIRCRAFT EQUIPMENT AG (THOMMEN) AC32 Digital Air Data Computers. This AD results from occurrences of AC32 Digital Air Data Computers (ADCs) that stop functioning below certain temperatures. This AD requires replacing an affected AC32 Digital ADC with a serviceable part. The FAA is issuing this AD to address the unsafe condition on these products.
Applicability · by US fleet size
- BELL 212 TCDS H4SW 54 tails
- BELL 412EP TCDS H4SW 24 tails
- BELL 222 TCDS H9SW 15 tails
- BELL 412 TCDS H4SW 12 tails
- BELL HELICOPTER TEXTRON 212 TCDS H4SW 5 tails
- LEONARDO S P A A109S 3 tails
- LEONARDO S P A AW189 3 tails
- AIRBUS HELICOPTERS AS332L1 TCDS H4EU 3 tails
- COLUMBIA HELICOPTERS 107-II TCDS 1H16 2 tails
- C A S A 212 1 tails
- GULFSTREAM AEROSPACE 550 1 tails
Federal Register text
Verbatim; the Federal Register publication is the legally binding document. Cite: 90 FR 15304. View on Federal Register ↗
[Federal Register Volume 90, Number 68 (Thursday, April 10, 2025)] [Rules and Regulations] [Pages 15304-15306] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 2025-06066]
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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.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for certain THOMMEN AIRCRAFT EQUIPMENT AG (THOMMEN) AC32 Digital Air Data Computers. This AD results from occurrences of AC32 Digital Air Data Computers (ADCs) that stop functioning below certain temperatures. This AD requires replacing an affected AC32 Digital ADC with a serviceable part. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective 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.