Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all ATR-GIE Avions de Transport Regional Model ATR42-500 and ATR72-212A airplanes. This proposed AD was prompted by reports indicating that certain Thales global positioning system (GPS) satellite based augmentation system (SBAS) receivers provided, under certain conditions, erroneous outputs on aircraft positions. This proposed AD would require replacing affected GPS SBAS receivers with new, improved receivers, as specified in a European Union Aviation Safety Agency (EASA) AD, which is proposed for incorporation by reference. The FAA is proposing this AD to address the unsafe condition on these products.