FAA Orders Speedometer Upgrades for ATR Planes to Prevent Glitches
Published Date: 10/2/2025
Rule
Summary
If you fly an ATR42-500 or ATR72 plane, listen up! The FAA found a problem with a part that monitors speed, which could cause trouble at high speeds. To fix this, airlines need to add some new relays and wiring and run tests soon to keep flights safe and sound.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 1 costs, 0 mixed.
Mandated Relay Installation on ATR Planes
Operators of ATR42-500 and ATR72 airplanes must modify those airplanes by installing one or two relays and associated wiring and by testing the travel limitation unit (TLU) monitoring logic, per the FAA airworthiness directive. The rule requires these physical changes and tests to address the identified unsafe condition.
Fixes High-Speed TLU Monitoring Error
The FAA found that the travel limitation unit (TLU) monitoring can be erroneous when an ATR42-500 or ATR72 is flying above a certain speed due to logic input from ADC1 or ADC2. The AD is issued to address this unsafe condition, improving flight safety for people who fly on these airplanes.
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Key Dates
Department and Agencies
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