# Proposed AD FAA-2025-1354: ATR-GIE Avions de Transport Régional Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2025-20-01
- Products: ATR – GIE Avions de Transport Régional
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 7, 2025, 90 FR 29802
- Comments due: August 21, 2025
- Became: [AD 2025-20-01](https://openairdocs.org/ad/2025-20-01)
- Docket: FAA-2025-1354 (https://www.regulations.gov/docket/FAA-2025-1354, where comments are filed)
- Project: MCAI-2025-00012-T
- FR document: 2025-12563
- Official PDF: https://openairdocs.org/files/sha256/3d/5c/3d5c7a6f3b76c8adf5a95a46ba26d908b8bebcc5c302d69e7d728ab706b7ab7d (from https://www.govinfo.gov/content/pkg/FR-2025-07-07/pdf/2025-12563.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/07/07/2025-12563/airworthiness-directives-atr-gie-avions-de-transport-rgional-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-12563-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-1354

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain ATR--GIE Avions de Transport R[eacute]gional Model ATR42- 500 and ATR72 airplanes. This proposed 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 proposed AD would require modifying airplanes by installing one or two relays and associated wiring, and testing of the TLU monitoring logic. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jul 7, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-12563, comments due Aug 21, 2025 (https://www.federalregister.gov/documents/2025/07/07/2025-12563/airworthiness-directives-atr-gie-avions-de-transport-rgional-airplanes)

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