Airworthiness Directive 2025-20-01
one-timeAirworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes
What this AD requires
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.
Which aircraft AD 2025-20-01 applies to
Applies to airplanes as identified in EASA AD 2025-0004, dated January 7, 2025.
Whether AD 2025-20-01 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.