AD 2025-19393
Published 2025-10-02 · 1 model · 1 US-registered tails affected · Federal Register
Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes Federal Register ↗
Abstract
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.
Applicability · by US fleet size
- TRAVEL AIR R 1 tails
Federal Register text
Verbatim; the Federal Register publication is the legally binding document. Cite: 90 FR 47544. View on Federal Register ↗
[Federal Register Volume 90, Number 189 (Thursday, October 2, 2025)] [Rules and Regulations] [Pages 47544-47546] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 2025-19393]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2025-1354; Project Identifier MCAI-2025-00012-T; Amendment 39-23154; AD 2025-20-01] RIN 2120-AA64
Airworthiness Directives; ATR--GIE Avions de Transport R[eacute]gional Airplanes
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 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.
DATES: This AD is effective November 6, 2025. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of November 6, 2025.