Data / Federal rules / 2025-19393
Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes
The Federal Aviation Administration published this final rule in the Federal Register on October 2, 2025. It took effect on November 6, 2025.
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What the agency says
The FAA is adopting a new airworthiness directive (AD) for certain ATR--GIE Avions de Transport R[eacute]gional Model ATR42-500 and ATR72 airplanes. This AD was prompted by an investigation indicating that an erroneous monitoring of the travel limitation unit (TLU) could occur when the airplane is flying above a certain speed as a result of the logic input from either air data computer (ADC) 1 or ADC2 input. This AD requires modifying airplanes by installing one or two relays and associated wiring and testing of the TLU monitoring logic. The FAA is issuing this AD to address the unsafe condition on these products.
Key facts
- Document number
- 2025-19393
- Type
- Final rule
- Action
- Final rule
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- October 2, 2025
- Takes effect
- November 6, 2025
- Dates
- This AD is effective November 6, 2025.
- Docket
- Docket No. FAA-2025-1354; Project Identifier MCAI-2025-00012-T; Amendment 39-23154; AD 2025-20-01
- Regulation ID (RIN)
- 2120-AA64
- Code of Federal Regulations
- 14 CFR 39
- Topics
- Air transportation; Aircraft; Aviation safety; Incorporation by reference; Safety
- Pages
- 3
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Everything from the Federal Aviation Administration · Rules on air transportation · Rules on aircraft · Rules on aviation safety · Published in October 2025
Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.